Journal articles: 'LUMINESCENCE MATERIALS'

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Yam, Vivian Wing-Wah. "Molecular design of luminescent metal-based materials." Pure and Applied Chemistry 73, no. 3 (January 1, 2001): 543–48. http://dx.doi.org/10.1351/pac200173030543.

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A series of soluble di- and polynuclear transition-metal acetylides with rich luminescence behavior have been designed and successfully isolated. The photophysical and photochemical properties have been studied. Luminescent polynuclear metal complexes have also been obtained based on the metal chalcogenide building block. These high-nuclearity transition-metal chalcogenide complexes have been structurally characterized and shown to display rich luminescence behavior. Various approaches and strategies to design and synthesize luminescent polynuclear metal complexes that may find potential applications as chemosensors and luminescence signalling devices will also be described.

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Tai, Xi Shi. "Preparation and Luminescence Properties of Two Novel Magnesium Complex Materials." Advanced Materials Research 321 (August 2011): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amr.321.121.

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In order to prepare efficient luminescence material, two kinds of novel magnesium luminescence materials were synthesized by the reaction of magnesium chloride with 2-acetyl-1-naphthol-diethylenetriamine (1) and 2-acetyl-1-naphthol-triethylenetetramine (2), respectively. The luminescent properties of two novel magnesium luminescence materials were investigated in solid and in DMSO solutions. The results show that two magnesium luminescence materials have high blue. The DMSO solvent could enhance the luminescence of complex (1), and also quench the luminescence of complex (2).

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Fritzen, Douglas L., Luidgi Giordano, Lucas C. V. Rodrigues, and Jorge H. S. K. Monteiro. "Opportunities for Persistent Luminescent Nanoparticles in Luminescence Imaging of Biological Systems and Photodynamic Therapy." Nanomaterials 10, no. 10 (October 13, 2020): 2015. http://dx.doi.org/10.3390/nano10102015.

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The use of luminescence in biological systems allows us to diagnose diseases and understand cellular processes. Persistent luminescent materials have emerged as an attractive system for application in luminescence imaging of biological systems; the afterglow emission grants background-free luminescence imaging, there is no need for continuous excitation to avoid tissue and cell damage due to the continuous light exposure, and they also circumvent the depth penetration issue caused by excitation in the UV-Vis. This review aims to provide a background in luminescence imaging of biological systems, persistent luminescence, and synthetic methods for obtaining persistent luminescent materials, and discuss selected examples of recent literature on the applications of persistent luminescent materials in luminescence imaging of biological systems and photodynamic therapy. Finally, the challenges and future directions, pointing to the development of compounds capable of executing multiple functions and light in regions where tissues and cells have low absorption, will be discussed.

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Sami, Hussain, Osama Younis, Yui Maruoka, Kenta Yamaguchi, Kumar Siddhant, Kyohei Hisano, and Osamu Tsutsumi. "Negative Thermal Quenching of Photoluminescence from Liquid-Crystalline Molecules in Condensed Phases." Crystals 11, no. 12 (December 13, 2021): 1555. http://dx.doi.org/10.3390/cryst11121555.

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The luminescence of materials in condensed phases is affected by not only their molecular structures but also their aggregated structures. In this study, we designed new liquid-crystalline luminescent materials based on biphenylacetylene with a bulky trimethylsilyl terminal group and a flexible alkoxy chain. The luminescence properties of the prepared materials were evaluated, with a particular focus on the effects of phase transitions, which cause changes in the aggregated structures. The length of the flexible chain had no effect on the luminescence in solution. However, in crystals, the luminescence spectral shape depended on the chain length because varying the chain length altered the crystal structure. Interestingly, negative thermal quenching of the luminescence from these materials was observed in condensed phases, with the isotropic phase obtained at high temperatures exhibiting a considerable increase in luminescence intensity. This thermal enhancement of the luminescence suggests that the less- or nonemissive aggregates formed in crystals are dissociated in the isotropic phase. These findings can contribute toward the development of new material design concepts for useful luminescent materials at high temperatures.

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Sharma, Suchinder K., Jinu James, Shailendra Kumar Gupta, and Shamima Hussain. "UV-A,B,C Emitting Persistent Luminescent Materials." Materials 16, no. 1 (December 27, 2022): 236. http://dx.doi.org/10.3390/ma16010236.

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The nearly dormant field of persistent luminescence has gained fresh impetus after the discovery of strontium aluminate persistent luminescence phosphor in 1996. Several efforts have been put in to prepare efficient, long decay, persistent luminescent materials which can be used for different applications. The most explored among all are the materials which emit in the visible wavelength region, 400–650 nm, of the electromagnetic spectrum. However, since 2014, the wavelength range is extended further above 650 nm for biological applications due to easily distinguishable signal between luminescent probe and the auto-fluorescence. Recently, UV-emitting persistent materials have gained interest among researchers’ due to their possible application in information storage, phototherapy and photocatalysis. In the present review, we summarize these recent developments on the UV-emitting persistent luminescent materials to motivate young minds working in the field of luminescent materials.

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Wang, Yangbo, Yingdong Han, Runfa Liu, Cunping Duan, and Huaiyong Li. "Excitation-Controlled Host–Guest Multicolor Luminescence in Lanthanide-Doped Calcium Zirconate for Information Encryption." Molecules 28, no. 22 (November 16, 2023): 7623. http://dx.doi.org/10.3390/molecules28227623.

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Efficient control over lanthanide luminescence by regulating excitations offers a real-time and reversible luminescence-managing strategy, which is of great importance and highly desirable for various applications, including multicolor display and information encryption. Herein, we studied the crystal structure, luminescence properties, and mechanisms of undoped and Tb3+/Eu3+-doped CaZrO3 in detail. The intrinsic purple-blue luminescence from host CaZrO3 and the introduced green/red luminescence from guest dopants Tb3+/Eu3+ were found to have different excitation mechanisms and, therefore, different excitation wavelength ranges. This enables the regulation of luminescent color through controlling the excitation wavelengths of Tb3+/Eu3+-doped CaZrO3. Furthermore, preliminary applications for information encryption with these materials were demonstrated using portable UV lamps of 254 and 302 nm. This study not only promotes the development of multicolor luminescence regulation in fixed-composition materials, but also advances the practical applications of lanthanide luminescent materials in visually readable, high-level anti-counterfeiting and information encryption.

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Xie, Dini, Hongshang Peng, Shihua Huang, and Fangtian You. "Core-Shell Structure in Doped Inorganic Nanoparticles: Approaches for Optimizing Luminescence Properties." Journal of Nanomaterials 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/891515.

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Doped inorganic luminescent nanoparticles (NPs) have been widely used in both research and application fields due to their distinctive properties. However, there is an urgent demand to improve their luminescence efficiency, which is greatly reduced by surface effects. In this paper, we review recent advances in optimizing luminescence properties of doped NPs based on core-shell structure, which are basically classified into two categories: one is by use of surface coating with nonmetal materials to weaken the influence of surface effect and the other is with metal shell via metal enhanced luminescence. Different materials used to coat NPs are surveyed, and their advantages and disadvantages are both commented on. Moreover, problems in current core-shell structured luminescent NPs are pointed out and strategies furthering the optimization of luminescence properties are suggested.

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Wang, Yu, and Huanrong Li. "Luminescent materials of zeolite functionalized with lanthanides." CrystEngComm 16, no. 42 (2014): 9764–78. http://dx.doi.org/10.1039/c4ce01455c.

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Luminescent materials based on the functionalization of zeolite with lanthanide constitute an intense research topic since they combine the attractive properties of zeolite and unique optical properties of Ln³⁺ ions. This review highlights the utilization of zeolite as luminescent materials showing tunable luminescence performance, well-organized structures and useful host–guest interactions.

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Huang, Tao, and Bingsuo Zou. "Luminescent Behavior of Sb3+-Activated Luminescent Metal Halide." Nanomaterials 13, no. 21 (October 29, 2023): 2867. http://dx.doi.org/10.3390/nano13212867.

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Metal halide perovskites have unparalleled optoelectronic properties and broad application potential and are expected to become the next epoch-making optoelectronic semiconductors. Although remarkable achievements have been achieved with lead halide perovskites, the toxicity of lead inhibits the development of such materials. Recently, Sb3+-activated luminescent metal halide perovskite materials with low toxicity, high efficiency, broadband, large Stokes shift, and emission wavelengths covering the entire visible and near-infrared regions have been considered one of the most likely luminescent materials to replace lead halide perovskites. This review reviews the synthesis, luminescence mechanism, structure, and luminescence properties of the compounds. The basic luminescence properties of Sb3+-activated luminescent metal halide perovskites and their applications in WLED, electroluminescence LED, temperature sensing, optical anti-counterfeiting, and X-ray scintillators are introduced. Finally, the development prospects and challenges of Sb3+-activated luminescent metal halide perovskites are discussed.

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Chiatti, Chiara, Claudia Fabiani, and Anna Laura Pisello. "Long Persistent Luminescence: A Road Map Toward Promising Future Developments in Energy and Environmental Science." Annual Review of Materials Research 51, no. 1 (July 26, 2021): 409–33. http://dx.doi.org/10.1146/annurev-matsci-091520-011838.

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In recent decades, research on persistent luminescence has led to new phosphors and promising performances. Efforts to improve the quality of phosphors’ afterglow have paved the way toward innovative solutions for many disciplines. However, there are few examples of the implementation of luminescent materials. In addition to providing a general background on persistent luminescence, the techniques used for its analysis, and its multidisciplinary potential in energy and environmental science, this article aims to explain the existing gap between the physical-chemical approach and the effective implementation of luminescent materials in larger-scale applications. It investigates engineering solutions in terms of the possible benefits of luminescence in lighting energy savings and passive cooling of urban surfaces. Finally, this article aims to reduce the abovementioned gap by suggesting what is most needed for the successful application of luminescent materials in the built environment.

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Tian, Junhang, Jihuan Xie, and Weidong Zhuang. "Recent Advances in Multi-Site Luminescent Materials: Design, Identification and Regulation." Materials 16, no. 6 (March 8, 2023): 2179. http://dx.doi.org/10.3390/ma16062179.

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The development of novel phosphor materials with excellent performance and modification of their photoluminescence to meet the higher requirements for applications are the essential research subjects for luminescent materials. Multi-site luminescent materials with crystallographic sites for the activator ions that broaden the tunable range of luminescent spectra and even enhance the luminescent performance have attracted significant attention in the pursuit of high-quality luminescence for white light-emitting diodes. Here, we summarize multi-site luminescence characteristics based on the different kinds of host and activator ions, introduce the identifications of multi-site activator ions via optical analysis, provide a structural analysis and theoretical calculation methods, and introduce the regulation strategies and advance applications of multi-site phosphors. The review reveals the relationship between crystal structure and luminescent properties and discusses future opportunities for multi-site phosphors. This will provide guidance for the design and development of luminescent materials or other materials science.

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Zhou, Pei, Nirmal Goswami, Tiankai Chen, Xiaoman Liu, and Xin Huang. "Engineering Au Nanoclusters for Relay Luminescence Enhancement with Aggregation-Induced Emission." Nanomaterials 12, no. 5 (February 25, 2022): 777. http://dx.doi.org/10.3390/nano12050777.

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The research of aggregation-induced emission (AIE) has been growing rapidly for the design of highly luminescent materials, as exemplified by the library of AIE-active materials (or AIEgens) fabricated and explored for diverse applications in different fields. Herein, we reported a relay luminescence enhancement of luminescent Au nanoclusters (Au NCs) through AIE. In addition, we demonstrated the emergence of reduced aggregation-caused luminescence by adjusting the temperature of the Au NC solution. The key to induce this effect is to attach a thermosensitive polymer poly(N-isopropylacrylamide) (PNIPAAm) on the surface of Au NCs, which will shrink at high temperature. More interestingly, the as-synthesized Au NCs-PNIPAAm can self-assemble into vesicles, resulting in an obvious decrease in the luminescence intensity in aqueous solution. The combination of relay luminescence enhancement (by AIE) and luminescence decrease (induced by thermosensitive polymers) will be beneficial to the understanding and manipulation of the optical properties of Au NCs, paving the way for their practical applications.

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Zhao, Zhihuan, Yao Wang, Haoyang Jiang, Jixian Liu, Linjun Huang, Yanna Zhang, Yanqi Wang, Laurence A. Belfiore, and Jianguo Tang. "Optical Features of Lanthanide Luminescent Hydrogel Based on Polyethylene Glycol with Silica Nanoparticles." Science of Advanced Materials 13, no. 1 (January 1, 2021): 123–30. http://dx.doi.org/10.1166/sam.2021.3850.

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Inorganic/polymer hybrid hydrogels generally exhibit excellent mechanical properties, while extra function include luminescence are extremely explored due to the further application in sensors and optoelectronic devices. Herein, we report the rare-earth (RE) complex/silica nanoparticles (SNs) luminescent hybrid polyethylene glycol (PEG) hydrogels showing stable luminescence. The hybrid hydrogels coordinated with RE (Eu3+) complex are fabricated via a convenient in situ photocrosslinked procedure. The coordination polymers showed red luminescent color under the 365 nm UV irradiation. Furthermore, the hybrid hydrogel exhibited long luminescence lifetime. These properties of hybrid luminescent hydrogel gave rise to a great improvement in the potential applications as a soft material.

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Wu, Xue-Ying, Qi Zhao, Dong-Xue Zhang, Ya-Chuan Liang, Kui-Kui Zhang, Qian Liu, Lin Dong, and Chong-Xin Shan. "A self-calibrated luminescent thermometer based on nanodiamond-Eu/Tb hybrid materials." Dalton Transactions 48, no. 22 (2019): 7910–17. http://dx.doi.org/10.1039/c9dt00850k.

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Meng, Shuai, Dengke Cheng, Hailing Gu, Yuchen Li, Yukun Qin, Jing Tan, and Qijun Li. "Mechanical Force-Induced Color-Variable Luminescence of Carbon Dots in Boric Acid Matrix." Molecules 28, no. 8 (April 12, 2023): 3388. http://dx.doi.org/10.3390/molecules28083388.

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Mechano-luminescent materials that exhibit distinct luminescence responses to force stimuli are urgently anticipated in view of application needs in the fields of sensing, anti-counterfeiting, optoelectronic devices, etc. However, most of the reported materials normally exhibit force-induced changes in luminescent intensity, whereas materials that possess force-induced color-variable luminescence remain rarely reported. Herein, for the first time, a novel mechanical force-induced color-variable luminescence material from carbon dots (CDs) in boric acid (CD@BA) is reported. At low CDs concentration, the luminescence of CD@BA exhibits a grinding-induced color variable from white to blue. This grinding-induced color variable can be switched to yellow-to-white changing by increasing the CDs concentration in BA. The grinding-induced color-variable luminescence originates from dynamic variation in emission ratio of fluorescence and room temperature phosphorescence, due to the influence of oxygen and water vapor in the air. At high CDs concentration, short-wavelength fluorescence undergoes more severe reabsorption compared to room temperature phosphorescence, leading to grinding-induced color-variable switching from white-to-blue to yellow-to-white. Based on the unique properties of CD@BA powder, the applications of recognizing and visualizing fingerprints on the surfaces of various of materials are demonstrated.

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Li, You, Heng Jian Huang, Li Min Dong, Dan Li, Wen Hao Shi, and Jia Rong Yin. "Preparation and luminescence properties of Mg2Sr2-XTiO4: Eu3+, Gd3+ red phosphors." Digest Journal of Nanomaterials and Biostructures 18, no. 1 (March 2023): 253–62. http://dx.doi.org/10.15251/djnb.2023.181.253.

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Titanate-based luminescent materials have a strong absorption capacity for blue and near-ultraviolet light. Here, a sol-gel method is used to prepare a high-efficiency red phosphor of magnesium titanate Mg2Sr2-xTiO4: Eu3+, Gd3+ doped with rare-earth ions. The optimal doping concentrations of the activator rare earth ion Eu3+ and the sensitizer Gd3+ were investigated. Furthermore, the doping of a certain amount of Sr2+ and Na+ effectively improves the luminescence properties of silicate luminescent materials. The luminescence spectrum shows that the luminescent material has red monochromaticity and the strongest red-light emission is 614nm, which can be used for WLED.

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Okamura, Tatsunori, and Kazuyoshi Ogasawara. "Theoretical Analysis of Anomalous Emission of Eu²⁺ in Crystals By First-Principles Calculation." ECS Meeting Abstracts MA2023-02, no. 50 (December 22, 2023): 2471. http://dx.doi.org/10.1149/ma2023-02502471mtgabs.

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The 5d-4f transition energies of lanthanides are very versatile, especially the 4f65d1-4f75d0 transition energy of Eu2+ has high luminescence efficiency and is used in various luminescent materials such as phosphors like SrxCa1-xAlSiN3: Eu2+, scintillators, and solid-state lasers, etc. However, there are materials that do not undergo pure 5d-4f transitions, showing the so-called anomalous luminescence instead. The anomalous luminescence is caused by the formation of excitons due to the overlap of the 5d level of Eu2+ with the conduction band and the transition of electrons from the conduction band to the 4f level, resulting in a shift to a lower energy than the general 5d-4f transition energy. A more detailed analysis of this phenomenon is important for the development of novel luminescent materials using Eu2+. In this study, we aimed to theoretically analyze the anomalous luminescence based on first-principles electronic structure calculations. The model clusters of Eu2+-doped crystals consisting of Eu2+ at the substitution site and the surrounding ions were created. Then molecular orbital calculations were performed by the relativistic discrete-variational Xα (DV-Xα) method and subsequently multiplet calculations were performed by the relativistic discrete-variational multi-electron (DVME) method. These first-principles calculations were carried out for Eu2+-doped crystals that show anomalous luminescence and those that do not show anomalous luminescence, and the electronic states of these materials were compared in detail.

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Лапаев, Д. В., В. Г. Никифоров, В. С. Лобков, А. А. Князев, and Ю. Г. Галяметдинов. "Стратегия создания фотостабильных люминесцентных материалов молекулярной фотоники на основе beta-дикетонатных комплексов лантаноидов (III)-=SUP=-*-=/SUP=-." Журнал технической физики 126, no. 1 (2019): 42. http://dx.doi.org/10.21883/os.2019.01.47051.281-18.

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AbstractAn analysis of the prospects for creating new luminescent molecular photonics materials based on mesogenic lanthanide(III) β-diketonate complexes is presented. We consider vitrified films that combine intense monochromatic luminescence, high optical quality, and complete resistance to UV radiation with the ability to change their photophysical properties (for example, the absorption band width and luminescence intensity) depending on the local structure and under external actions, such as UV radiation and temperature. The problems of control of the photophysical properties of these films and the possibility of their application as working media of high-tech luminescent materials and devices (for example, luminescent sensors of temperature, oxygen, and UV radiation, as well as light-conversion materials) are discussed.

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Roitershtein, Dmitrii M., Lada N. Puntus, Konstantin A. Lyssenko, Ilya V. Taidakov, Evgenia A. Varaksina, Mikhail E. Minyaev, Victor A. Gerasin, et al. "An efficient route for design of luminescent composite materials based on polyethylene containing europium dibenzoylmethanate." New Journal of Chemistry 41, no. 22 (2017): 13663–72. http://dx.doi.org/10.1039/c7nj03055j.

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Poeplau, Michael, Stephan Ester, Bernd Henning, and Thorsten Wagner. "Recombination mechanisms of luminescence type gas sensors." Physical Chemistry Chemical Physics 22, no. 35 (2020): 19948–56. http://dx.doi.org/10.1039/d0cp02269a.

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The impact of the recombination mechanisms in luminescent materials is discussed with regard to luminescence based gas-sensing applications and the use of semiconducting materials, as an alternative to organic–metal complexes, is outlined.

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Đačanin Far, Ljubica, and Miroslav D. Dramićanin. "Luminescence Thermometry with Nanoparticles: A Review." Nanomaterials 13, no. 21 (November 5, 2023): 2904. http://dx.doi.org/10.3390/nano13212904.

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Luminescence thermometry has emerged as a very versatile optical technique for remote temperature measurements, exhibiting a wide range of applicability spanning from cryogenic temperatures to 2000 K. This technology has found extensive utilization across many disciplines. In the last thirty years, there has been significant growth in the field of luminous thermometry. This growth has been accompanied by the development of temperature read-out procedures, the creation of luminescent materials for very sensitive temperature probes, and advancements in theoretical understanding. This review article primarily centers on luminescent nanoparticles employed in the field of luminescence thermometry. In this paper, we provide a comprehensive survey of the recent literature pertaining to the utilization of lanthanide and transition metal nanophosphors, semiconductor quantum dots, polymer nanoparticles, carbon dots, and nanodiamonds for luminescence thermometry. In addition, we engage in a discussion regarding the benefits and limitations of nanoparticles in comparison with conventional, microsized probes for their application in luminescent thermometry.

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Pellé, Fabienne, Tuomas Aitasalo, Mika Lastusaari, Janne Niittykoski, and Jorma Hölsä. "Optically stimulated luminescence of persistent luminescence materials." Journal of Luminescence 119-120 (July 2006): 64–68. http://dx.doi.org/10.1016/j.jlumin.2005.12.064.

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Mar’ina, Ul’ana A., Viktor A. Vorob’ev, and Alexandr P. Mar’in. "IR luminescence of CaGa 2O 4 : Yb 3+ excited by 940 and 980 nm radiation." Modern Electronic Materials 6, no. 1 (March 30, 2020): 31–36. http://dx.doi.org/10.3897/j.moem.6.1.55165.

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Existing calcium gallate CaGa2O4 based luminescent materials radiating in visible IR region have been reviewed. IR luminophores have been studied but slightly but their practical implementation is of interest. CaGa2O4 specimens activated with Yb3+ rare-earth ions have been synthesized using the solid-state method. The structure and luminescent properties of CaGa2O4 : Yb3+ have been studied. CaGa2O4 : Yb3+ excitation with 940 and 980 nm radiation generates luminescence in the 980–1100 nm region. Data on the electron level structure in Yb3+ ions suggest that the excitation and luminescence occur directly in the Yb3+ ions with only a passive role of the base lattice. The luminescence spectra contain three peaks at 993, 1025 and 1080 nm. These luminescence peaks are caused by electron optical transitions from excited to main state in Yb3+ ions. 993 nm band luminescence intensity has been studied as a function of Yb3+ activator ions concentration. Introduction of Na+ ions into the luminophore increases IR luminescence intensity. Optimum (Ca1-x-yYbxNay)Ga2O4 luminophore composition has been suggested at which the 993 nm luminescence intensity is the highest.

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Yang, Yujiao, Yang Zhang, Sheng Xie, Youhong Tang, Zebing Zeng, and Ben Zhong Tang. "Hydrogel-derived luminescent scaffolds for biomedical applications." Materials Chemistry Frontiers 5, no. 9 (2021): 3524–48. http://dx.doi.org/10.1039/d0qm01140a.

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Xing, Zhiming, Wanhui Wu, Yongxiang Miao, Yingqun Tang, Youkang Zhou, Lifang Zheng, Yang Fu, Zhibin Song, and Yiyuan Peng. "Recent advances in quinazolinones as an emerging molecular platform for luminescent materials and bioimaging." Organic Chemistry Frontiers 8, no. 8 (2021): 1867–89. http://dx.doi.org/10.1039/d0qo01425g.

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This review summarized recent advances relating to the luminescence properties of quinazolinones and their applications in fluorescent probes, biological imaging and luminescent materials. Their future outlook is also included.

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Gonzalez-Carrero, Soranyel, Guillermo Mínguez Espallargas, Raquel E. Galian, and Julia Pérez-Prieto. "Blue-luminescent organic lead bromide perovskites: highly dispersible and photostable materials." Journal of Materials Chemistry A 3, no. 26 (2015): 14039–45. http://dx.doi.org/10.1039/c5ta01765c.

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Blue-luminescent and dispersible organic–inorganic hybrid perovskites can be produced with a high reaction yield and valuable optical properties, such as luminescence quantum yield over 20% and high photostability under UV light. This material can be assembled–disassembled reversibly.

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Nakamura, Kazuki, Namiko Yanagawa, and Norihisa Kobayashi. "Magenta-Blue Electrofluorochromic Device Incorporating Eu(III) Complex, Anthracene Derivative, and Viologen Molecule." Materials 15, no. 15 (July 27, 2022): 5202. http://dx.doi.org/10.3390/ma15155202.

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Electrochemical switching of luminescence color between magenta and blue using two types of luminescent materials and electrochromic molecules was demonstrated based on the control of excited energy transfer through an electrochromic reaction. The magenta photoluminescence, due to the integration of red luminescence from the Eu(III) complex and blue fluorescence from the anthracene derivative, was reversibly modulated to a pure-blue luminescence color by an electrochemical redox reaction. Electrofluorochromism is induced by effective excited energy transfer from the Eu(III) complex to the electrochromic molecule under a redox reaction.

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Gao, Dangli, Peng Wang, Feng Gao, William Nguyen, and Wei Chen. "Tuning Multicolor Emission of Manganese-Activated Gallogermanate Nanophosphors by Regulating Mn Ions Occupying Sites for Multiple Anti-Counterfeiting Application." Nanomaterials 12, no. 12 (June 13, 2022): 2029. http://dx.doi.org/10.3390/nano12122029.

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The ability to manipulate the luminescent color, intensity and long lifetime of nanophosphors is important for anti-counterfeiting applications. Unfortunately, persistent luminescence materials with multimode luminescent features have rarely been reported, even though they are expected to be highly desirable in sophisticated anti-counterfeiting. Here, the luminescence properties of Zn3Ga2GeO8:Mn phosphors were tuned by using different preparation approaches, including a hydrothermal method and solid-state reaction approach combining with non-equivalent ion doping strategy. As a result, Mn-activated Zn3Ga2GeO8 phosphors synthesized by a hydrothermal method demonstrate an enhanced red photoluminescence at 701 nm and a strong green luminescence with persistent luminescence and photostimulated luminescence at 540 nm. While Mn-activated Zn3Ga2GeO8 phosphors synthesized by solid-state reactions combined with a hetero-valent doping approach only exhibit an enhanced single-band red emission. Keeping the synthetic method unchanged, the substitution of hetero-valent dopant ion Li+ into different sites is valid for spectral fine-tuning. A spectral tuning mechanism is also proposed. Mn-activated Zn3Ga2GeO8 phosphors synthesized by a hydrothermal approach with multimodal luminescence is especially suitable for multiple anti-counterfeiting, multicolor display and other potential applications.

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Hanna, S. A., Igor Yu Prosanov, and Anatoly A. Sidelnikov. "Luminescence of polyvinyl alcohol – CdS compounds doped with Cu, Al and Mn." Applied photonics 10, no. 3 (July 1, 2023): 23–35. http://dx.doi.org/10.15593/2411-4375/2023.3.03.

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Polyvinyl alcohol – CdS compounds doped with different concentrations of Cu, Al and Mn were produced. It is expected that these compounds have one-dimensional (polymeric) structure. Their luminescence spectra were investigated with the aim of use of luminescence for the structure characterization through comparison of luminescent properties of compounds and other CdS based materials. It was found that addition of copper leads to luminescence quenching while intensity of luminescence of compound doped with manganese reaches maximum at some concentration of additive and aluminum does not influence noticeably on the luminescence intensity of the compound. Luminescence spectra were not significantly changed at the doping. They are different from spectrum of crystalline CdS and similar to luminescence of CdS dissolved in glass. It was also found that luminescence of compounds is highly polarized, luminescence of glass is less polarized and luminescence of crystal CdS is not polarized.

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Werts, Martinus H. V. "Making sense of Lanthanide Luminescence." Science Progress 88, no. 2 (May 2005): 101–31. http://dx.doi.org/10.3184/003685005783238435.

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The luminescence of trivalent lanthanide ions has found applications in lighting, lasers, optical telecommunications, medical diagnostics, and various other fields. This introductory review presents the basics of organic and inorganic luminescent materials containing lanthanide ions, their applications, and some recent developments. After a brief history of the discovery, purification and early spectroscopic studies of the lanthanides, the radiative and nonradiative transitions of the 4f electrons in lanthanide ions are discussed. Lanthanide-doped phosphors, glasses and crystals as well as luminescent lanthanide complexes with organic ligands receive attention with respect to their preparation and their applications. Finally, two recent developments in the field of luminescent materials are addressed: near-infrared luminescent lanthanide complexes and lanthanide-doped nanoparticles.

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Wang, Chen, Luyao Feng, Junxiao Liu, Jing Fu, Jinglin Shen, and Wei Qi. "Manipulating the Assembly of Au Nanoclusters for Luminescence Enhancement and Circularly Polarized Luminescence." Nanomaterials 12, no. 9 (April 25, 2022): 1453. http://dx.doi.org/10.3390/nano12091453.

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Au nanocluster (AuNCs)-based luminescent functional materials have attracted the interest of researchers owing to their small size, tractable surface modification, phosphorescence lifetime and biocompatibility. However, the poor luminescence quantum yield (QY) of AuNCs limits their practical applications. Herein, we synthesized a type of AuNCs modified by 4,6-diamino-2-mercaptopyrimidine hydrate (DPT-AuNCs). Furthermore, organic acids, i.e., citric acid (CA) and tartaric acid (TA), were chosen for co-assembly with DPT-AuNCs to produce AuNCs-based luminescent materials with enhanced emission. Firstly, it was found that CA could significantly enhance the emission of DPT−AuNCs with the formation of red emission nanofibers (QY = 17.31%), which showed a potential for usage in I− detection. The n···π/π···π interaction between the CA and the DPT ligand was proposed as crucial for the emission. Moreover, chiral TA could not only improve the emission of DPT-AuNCs, but could also transfer its chirality to DPT-AuNCs and induce the formation of circularly polarized luminescence (CPL)-active nanofibers. It was demonstrated that the CPL signal could increase 4.6-fold in a ternary CA/TA/DPT-AuNCs co-assembly system. This work provides a convenient way to build AuNCs-based luminescent materials as probes, and opens a new avenue for building CPL-active materials by achiral NCs through a co-assembly strategy.

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Wang, Chen, Luyao Feng, Junxiao Liu, Jing Fu, Jinglin Shen, and Wei Qi. "Manipulating the Assembly of Au Nanoclusters for Luminescence Enhancement and Circularly Polarized Luminescence." Nanomaterials 12, no. 9 (April 25, 2022): 1453. http://dx.doi.org/10.3390/nano12091453.

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Au nanocluster (AuNCs)-based luminescent functional materials have attracted the interest of researchers owing to their small size, tractable surface modification, phosphorescence lifetime and biocompatibility. However, the poor luminescence quantum yield (QY) of AuNCs limits their practical applications. Herein, we synthesized a type of AuNCs modified by 4,6-diamino-2-mercaptopyrimidine hydrate (DPT-AuNCs). Furthermore, organic acids, i.e., citric acid (CA) and tartaric acid (TA), were chosen for co-assembly with DPT-AuNCs to produce AuNCs-based luminescent materials with enhanced emission. Firstly, it was found that CA could significantly enhance the emission of DPT−AuNCs with the formation of red emission nanofibers (QY = 17.31%), which showed a potential for usage in I− detection. The n···π/π···π interaction between the CA and the DPT ligand was proposed as crucial for the emission. Moreover, chiral TA could not only improve the emission of DPT-AuNCs, but could also transfer its chirality to DPT-AuNCs and induce the formation of circularly polarized luminescence (CPL)-active nanofibers. It was demonstrated that the CPL signal could increase 4.6-fold in a ternary CA/TA/DPT-AuNCs co-assembly system. This work provides a convenient way to build AuNCs-based luminescent materials as probes, and opens a new avenue for building CPL-active materials by achiral NCs through a co-assembly strategy.

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Gao, Dangli, Jie Gao, Feng Gao, Qingqing Kuang, Yong Pan, Yafei Chen, and Zhengwei Pan. "Quintuple-mode dynamic anti-counterfeiting using multi-mode persistent phosphors." Journal of Materials Chemistry C 9, no. 46 (2021): 16634–44. http://dx.doi.org/10.1039/d1tc04568g.

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Multi-level, dynamic optical anti-counterfeiting has been achieved using multi-mode phosphors as luminescent inks. The ZGGO:Cr,Yb,Er phosphors exhibit quintuple luminescence modes, while the ZLGO:Mn phosphors possess quadruple luminescence modes.

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Gartia, R. K., and Ngangbam Chandrasekhar. "Thermoluminescence of Persistent Luminescent Materials." Defect and Diffusion Forum 357 (July 2014): 171–91. http://dx.doi.org/10.4028/www.scientific.net/ddf.357.171.

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Persistent luminescence as well as Thermoluminescence (TL), both the phenomena are nothing but long-period afterglow having lifetime (τ) in the broad range of few minutes to few days. Therefore, it is nothing but natural that all persistent luminescent materials exhibit excellent thermoluminescence. This review critically discusses the data available in literature and provides a commentary on the trap-spectroscopy of persistent luminescent materials as a whole with special emphasis to commercial materials that have found wide applications in safety signage, road sign display as well as sensors for structural damage and in vivo medical imaging. Finally, it also provides some “thumb-rules” to eliminate few fatal misconceptions that have crept into the literature

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Ji, Zhi Xiang. "Preparation and Characterization of Two New Luminescent Material." Advanced Materials Research 322 (August 2011): 365–68. http://dx.doi.org/10.4028/www.scientific.net/amr.322.365.

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Two new luminescent materials were prepared by the reaction of Eu (III) and Tb (III) ions with N’-(2-acetyl-3-methylpyrazine)-4-toluene-sulfonylhydrazide in ethanol solution, respectively. The composition of the luminescent materials was confirmed by elemental analysis, infrared spectra and X-ray crystallography. The luminescent properties of two new luminescent materials were investigated in solid. The results show that two new luminescent materials have strong characteristic luminescence in red and blue region, respectively.

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Zhu, Li, Lei Chen, and Wen Di Tan. "Rare Earth Luminescent Materials in Landscape Lighting Application." Applied Mechanics and Materials 302 (February 2013): 227–29. http://dx.doi.org/10.4028/www.scientific.net/amm.302.227.

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Rare earth luminescent material is in recent years focus on Cultivation of the advanced material industry, its luminescence properties in life applications are very extensive, but widely is used in industrial field and luminescent TV, lamp production direction, in landscape planning application field is very limited. Because not only is the rare earth luminescent material, and landscape areas are in recent years started to gain attention field, its research is still in the young state, interdisciplinary communication is not much also, this makes the rare earth luminescent material itself advantage there is still much room for improvement. In this paper, for the rare earth luminescent material characteristic research in the landscape of the expansion and sustainability. For the rare earth luminescent material and landscape design to provide more materials application may.

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Shen, Yue, Shiyin Wang, Xiangyu Zhang, Nan Li, Haichao Liu, and Bing Yang. "Supramolecular complex strategy for pure organic multi-color luminescent materials and stimuli-responsive luminescence switching." CrystEngComm 23, no. 34 (2021): 5918–24. http://dx.doi.org/10.1039/d1ce00449b.

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Pure organic multi-color luminescent materials were finely tuned from blue through green to red using a supramolecular complex strategy, exhibiting force- and solvent-sensitive luminescence switching in the stimuli-responsive field.

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Knyazev, Andrey A., Aleksandr S. Krupin, and Yuriy G. Galyametdinov. "Composites Based on Polylactide Doped with Amorphous Europium(III) Complex as Perspective Thermosensitive Luminescent Materials." Inorganics 10, no. 12 (November 30, 2022): 232. http://dx.doi.org/10.3390/inorganics10120232.

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This work reports fabrication of polylactide (PLA) films doped with various additives of an amorphous Eu(III) complex. We study the temperature behavior of the luminescence intensity and lifetime of the PLA-Eu(III) composites in the range of 298–353 K and investigate the mechanism of luminescence temperature quenching. The peak relative sensitivity of the films reaches 20.1 %×K−1 and exceeds the respective characteristics of all known lanthanide-containing thermosensors designed for the range of physiological temperatures. The produced films can be potential novel materials for luminescent thermosensors.

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Grmela, Lubomír, Pavel Tománek, and Pavel Škarvada. "Near-Field Study of Hot Spot Photoluminescence Decay in ZnS:Mn Nanoparticles." Materials Science Forum 567-568 (December 2007): 241–44. http://dx.doi.org/10.4028/www.scientific.net/msf.567-568.241.

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The local spatial distribution of photoluminescence due to the creation of hot luminescence centers was measured in the optical near-field by Scanning near-field optical microscope at emission peaks of materials (λ =595nm), which is due to the luminescence of Mn2+ in ZnS. The excitation bandgap of ZnS forms exitons, and these excitons get the center of Mn2+ through nonradiation dominates, by means of transition of 4T1 – 6A1 luminescence. This spectrum is evidence that Mn2+ has been incorporated into the ZnS nanoparticles. In comparison with the bulk ZnS:Mn phosphors these nanoparticles have clearly higher luminescent efficiency with its luminescent decay time at least 4 orders of magnitude slower. It means that the oscillator intensity of luminescent centers in ZnS:Mn nanocrystal enhances at least 4 orders of magnitude than that in corresponding bulk ZnS:Mn.

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WU Wen-jie, 武文杰, 阿木古楞 Amugulen, 刘文全 LIU Wen-quan, 朝克夫 CHAO Ke-fu, and 特古斯 Tegus. "Synthesis and luminescence of nitride and oxynitride luminescent materials." Chinese Journal of Liquid Crystals and Displays 32, no. 9 (2017): 663–76. http://dx.doi.org/10.3788/yjyxs20173209.0663.

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Su, Liumei, Xing Fan, Teng Yin, Huide Wang, Yu Li, Fusheng Liu, Junqin Li, Han Zhang, and Heping Xie. "Inorganic 2D Luminescent Materials: Structure, Luminescence Modulation, and Applications." Advanced Optical Materials 8, no. 1 (October 16, 2019): 1900978. http://dx.doi.org/10.1002/adom.201900978.

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Wang, Li Hua. "Infrared and Luminescent Properties of Mg (II) Fluorescence Materials." Advanced Materials Research 322 (August 2011): 412–15. http://dx.doi.org/10.4028/www.scientific.net/amr.322.412.

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A new luminescent material, 1-acetyl-2-naphthol-4, 4'-diaminodiphenyl ether Mg (II) has been designed, synthesized and characterized. The infrared spectrum and luminescent properties of Mg (II) material have been investigated. The results indicate that the Mg (II) fluorescent material emits blue luminescence with an emission peak at 455 nm when excited at 327 nm, and the effect of organic solvents on the luminous intensity of Mg (II) fluorescent material was arranged in the order CH3CH2OH > DMSO > solid> CH3OH.

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Li, Xincheng. "Differences of the Luminous Principle between Laser devices and LED devices." E3S Web of Conferences 213 (2020): 02028. http://dx.doi.org/10.1051/e3sconf/202021302028.

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The concept of luminescence has been a fascinating concept to mankind. The goal of this paper is to provide insights into the mysterious phenomenon of photoluminescence occurring from natural crystal lattice materials through electron radiation processes. The research methods used in the study involve the detection, identification, and interpretation of the structure, the working principle of the luminescence concept, and the application of the concept of luminescence from written materials. The methods extracted from the materials involve biological and biochemical lab methods based on the existence of phosphorescence, chemiluminescence, bioluminescence, and finally fluorescence. The study paper also highlights the differences between LEDs and LASERS, which are the main types of luminescence producing semiconductor devices. Their variations are presented in aspects of their working principle, the type of luminescence they produce, the respective output power, and the speed, transmitting distance & cost of each. Photoluminescence is a concept whose applications are widespread in the physical and chemical processes of our daily activities. Therefore, it is important to have a sufficient understanding of the successful applications of luminescent enhancement.

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MacRae, Colin M., and Nicholas C. Wilson. "Luminescence Database I—Minerals and Materials." Microscopy and Microanalysis 14, no. 2 (March 3, 2008): 184–204. http://dx.doi.org/10.1017/s143192760808029x.

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A luminescence database for minerals and materials has been complied from the literature, the aim being to create a resource that will aid in the analysis of luminescence spectral of ionic species in minerals and materials. The database is based on a range of excitation techniques and records both major and minor lines, and their activators. The luminescence techniques included in the database are cathodoluminescence, ion luminescence, and photoluminescence. When combined with other traditional X-ray measurements collected on the same region, use of the luminescence database will give additional insight into the chemistry of minerals and materials.

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Kondo, Mizuho, Yuya Morita, and Nobuhiro Kawatsuki. "Blue-Shifting Mechanofluorochromic Luminescent Behavior of Polymer Composite Films Using Gelable Mechanoresponsive Compound." Crystals 11, no. 8 (August 15, 2021): 950. http://dx.doi.org/10.3390/cryst11080950.

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Mechanochromic luminescent dyes change their luminescence color upon exposure to external mechanical stimuli. In this study, we synthesized a liquid crystalline mechanochromic luminescent dye containing a terminal cholesterol molecule. The dissolution of the dye in 1,4-dioxane resulted in the formation of a gel. The luminescence of the xerogel obtained from the dioxane solution changed from green to blue upon grinding, indicating mechanochromic luminescence behavior. The anisotropic patterning of short-wavelength-shifted luminescence color change by directional handwriting on surface layer of liquid crystal was successfully demonstrated. Furthermore, blue-shifting mechanoresponsive polymer composite surface was fabricated by using the luminophore.

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Tai, Xi Shi. "Synthesis and Luminescent Characterization of Highlight Blue Mg (II) Materials." Advanced Materials Research 366 (October 2011): 141–44. http://dx.doi.org/10.4028/www.scientific.net/amr.366.141.

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A new highlight blue luminescent material has been prepared by the reaction of Mg (II) ion with 1-acetyl-2-naphthol-4, 4’-diaminodiphenylsulfone. The material was analyzed by infrared spectrum and elemental analysis. The luminescent properties of Mg (II) material were studied in solid in CH3OH, in CH3CH2OH and in DMSO solution, respectively. The results show that the Mg (II) material exhibits highlight blue luminescence emission, and exhibits the strongest fluorescence in CH3CH2OH solution than in solid and in CH3OH and in DMSO solution.

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Grzyb, Tomasz, Rafal J. Wiglusz, Vitali Nagirnyi, Aleksei Kotlov, and Stefan Lis. "Revised crystal structure and luminescent properties of gadolinium oxyfluoride Gd4O3F6doped with Eu3+ions." Dalton Trans. 43, no. 18 (2014): 6925–34. http://dx.doi.org/10.1039/c4dt00338a.

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Zhang, Ning, and Shiqing Man. "Luminescent Properties of a Novel Mn²⁺ doped 3CaO-CaF₂-2SiO₂ Glasses." Journal of Physics: Conference Series 2076, no. 1 (November 1, 2021): 012048. http://dx.doi.org/10.1088/1742-6596/2076/1/012048.

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Abstract The transition metal Mn2+ ions doped materials have been widely reported for the luminescent properties for its broad emission band from green to red due to the spin-forbidden 4T1→6A1 transitions. To investigate the luminescent properties of Mn2+ ions in cuspidine glass, the 3CaO-CaF2-2SiO2 glasses doped with different Mn2+ concentration were prepared with traditional melt-quenching method. The luminescence emission spectra, excitation spectra and luminescence decay curves were recorded and analyzed. The tunable broadband emission from orange to red was obtained. The luminescence intensity and lifetime of Mn2+: 4T1 level showed different quenching points with the increasing of Mn2+ concentration. All these results indicate that Mn2+ doped 3CaO-CaF2-2SiO2 glass could be applied as light conversion material for solid-state lighting applications.

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Lide, Zhang, and Chi-mei Mo. "Luminescence in nanostructured materials." Nanostructured Materials 6, no. 5-8 (January 1995): 831–34. http://dx.doi.org/10.1016/0965-9773(95)00188-3.

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Wu, Mihye, Hyemin Park, Eun Gyu Lee, Sanghun Lee, Yu Jin Hong, and Sungho Choi. "Luminescence Quenching Behavior of Hydrothermally Grown YVO4:Eu3+ Nanophosphor Excited under Low Temperature and Vacuum Ultra Violet Discharge." Materials 13, no. 15 (July 23, 2020): 3270. http://dx.doi.org/10.3390/ma13153270.

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The luminescence quenching behavior and energy transfer process in hydrothermally grown Eu3+-doped YVO4 nanophosphors were studied using low temperature photoluminescence spectroscopy. The luminescence efficiency of nanophosphor is dependent on the acidity of its solution media and the post annealing condition after hydrothermal processing. The overall results suggest that the abnormal luminescence behavior of Eu3+-doped nanocrystalline YVO4 under low temperature photoexcitation is due to the incorporated non-radiative hydroxyl groups often encountered in hydrothermal synthesis as well as to the inefficient energy transfer to luminescent ions from vanadate groups.

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Journal articles on the topic 'LUMINESCENCE MATERIALS'

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