Relevant bibliographies by topics / Luminescence enhancement

Academic literature on the topic 'Luminescence enhancement'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Luminescence enhancement"

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Han, Qingyan, Yaqiong Zhang, Zebin Ren, Zhaojin Wang, Wei Gao, Enjie He, and Hairong Zheng. "Ag@SiO2/LaF3:Eu3+ Composite Nanostructure and Its Surface Enhanced Luminescence Effect." Journal of Nanoscience and Nanotechnology 16, no. 4 (April 1, 2016): 3759–62. http://dx.doi.org/10.1166/jnn.2016.11813.

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Ag@SiO2/LaF3:Eu3+ core–shell nanostructure was synthesized with a wet chemical method in which the SiO2 layer functioned as a separation layer between Ag-core and LaF3:Eu3+ luminescence material. With this system, surface enhanced luminescene of LaF3:Eu3+ with Ag substrate was investigated, and an obvious enhancement effect was observed. The dependence of the luminescence enhancement on the distance between the luminescence shell and the metallic core was studied too. It is believed that the enhancement effect presented by the current hybrid nanostructure system has great potential in the development of photovoltaic cells.
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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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Rigo, Maria Veronica, and Peter Geissinger. "Measurement and Optimization of Metal-Nanoparticle-Induced Luminescence Enhancement Factors in a Crossed-Optical Fiber Configuration." Journal of Nanomaterials 2010 (2010): 1–11. http://dx.doi.org/10.1155/2010/396214.

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A crossed-optical-fiber configuration comprised of silver nanoparticles covalently attached to the core of an optical fiber and labeled with luminescent ruthenium molecules is reported. A second optical fiber was placed at right angle of the fiber containing the nanoparticle/ruthenium, to form a fiber-fiber junction, and it was used to detect the luminescence from the ruthenium molecules bound to the first fiber. To employ the effect of metal-enhanced luminescence, the ruthenium complex was kept at an appropriate distance from the nanoparticles by polyelectrolyte spacer layers. For silver nanospheres, nanotriangles and nanorods and for spacer-layer thicknesses from 2–14 nm luminescence-enhancement factors were determined. A 27-fold luminescence enhancement was found when the ruthenium complex was placed 4 nm from silver nanotriangles. Finally, a calibration curve for the oxygen dependence of luminescence intensities and lifetimes of ruthenium complex is presented suggesting that the oxygen sensing capabilities of the nanoengineered-ruthenium complex are maintained.
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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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Pavelka, Ondrej, Klaudia Kvakova, Jozef Vesely, Jiri Mizera, Petr Cigler, and Jan Valenta. "Optically coupled gold nanostructures: plasmon enhanced luminescence from gold nanorod-nanocluster hybrids." Nanoscale 14, no. 8 (2022): 3166–78. http://dx.doi.org/10.1039/d1nr08254j.

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Assembly of two gold nanostructures, luminescent nanoclusters and plasmonic nanorods, allows for a controlled enhancement of luminescence. The system shows unprecedented degree of control over geometry and optical properties.
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Li, Bin, Zhi-Jun Ding, Zhiqiang Li, and Huanrong Li. "Simultaneous enhancement of mechanical strength and luminescence performance in double-network supramolecular hydrogels." Journal of Materials Chemistry C 6, no. 25 (2018): 6869–74. http://dx.doi.org/10.1039/c8tc02154f.

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We observed remarkable simultaneous enhancement of both mechanical strength and luminescence performance in the presented luminescent supramolecular hydrogels, which were obtained by copolymerization of functional lanthanide-containing co-monomers and acrylamide monomers.
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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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Wen, Jing, Ding Jiang, Xueling Shan, Wenchang Wang, Fangmin Xu, and Zhidong Chen. "A novel electrochemiluminescence aptasensor for sensitive detection of kanamycin based on the synergistic enhancement effects between black phosphorus quantum dots and silver-decorated high-luminescence polydopamine nanospheres." Analyst 146, no. 11 (2021): 3493–99. http://dx.doi.org/10.1039/d1an00265a.

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Using BPQDs loaded on silver-modified high-luminescence polydopamine nanospheres (HLPNs@Ag/BP) as a luminescent material, the fabricated ECL sensor, which is based on the synergistic enhancement effects, may detect KAN sensitively and selectively.
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Wang, Shuaiqi, Duobin Wu, Shuming Yang, Hongyu Zhen, Zhenghuan Lin, and Qidan Ling. "Highly-efficient and stable warm white emission from perovskite/silica composites with photoactivated luminescence enhancement." Journal of Materials Chemistry C 8, no. 36 (2020): 12623–31. http://dx.doi.org/10.1039/d0tc03249b.

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Composite films based on Mn-doped perovskites emit strong and stable warm white light, and can be used as single-component luminescent material in UV-driven WLEDs. Additionally, the films exhibit interesting photoinduced-luminescence enhancement.
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Dissertations / Theses on the topic "Luminescence enhancement"

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Chen, Thomas D. (Thomas Duhwa). "Energy transfer and luminescence enhancement in Er-doped silicon." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9536.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
Also issued in pages.
Includes bibliographical references (leaves 143-152).
Er-doped silicon (Si:Er) is a promising light emitting material for silicon microphotonics. A study of Si:Er excitation/de-excitation mechanisms and luminescence enchancement is presented in this thesis. A model based on impurity Auger and nonradiative nmltiphonon transitions (NRl\·IPT) is shown to describe the temperature quenching of the photoluminescence (PL) intensity from 4K to 300K This model asserts that the nonradiative Auger process is mainly responsible for the temperature quenching below lOOK, and NRMPT backtransfer process is mainly responsible for the temperature quenching above lOOK. Junction photocufrei1t · spectmscopy (JPCS) measurements confirmed the existence of a backtransfer mechanism that grows with temperature in accordance to the model. In order to circumvent the onset of nonradiative transitions at higher temperatures, spontaneous emission enhancement in nrnltilayer Si/Si02 microcavities was explored as a means to increase the PL intensity. Because multilayer microcavity structures cannot be constructed using single crystal silicon, Er-doped polysilicon (poly-Si:Er) was developed as a light emitting material for these microcavities. The poly-Si:Er material exhibited a luminescence very similar to that of Er in single crystal silicon. By crystallizing poly-Si:Er from amorphous material and performing a post-anneal hydrogenation, a reasonably high PL intensity, which was limited by the excitation power, was attained. Microacavities with poly-Si:Er were fabricated and measured for the first time. Cavity quality factors of -60-300 were measured, and an Er enhancement of -20x was observed. A -lOx enhancement of a small background emission from the polysilicon was also observed. The observed enhancement factors match well with computed enhancement factors derived from electric field intensity distribution within the microcavity structure. Exploratory work in optical gain from Si:Er waveguides and vertically coupled ring resonntors was conducted. A fiber coupling technique for low temperature waveguide transmission experiments was developed for the gain experiments. The transmission spectrum of a 3-cm long waveguide was measured at temperatures down to 125K. Because the temperature could not be lowered without debonding the fiber, a net gain could not be observed in this particular waveguide. The application of stimulated emission in Si:Er devices is analyzed and discussed.
by Thomas Duhwa Chen.
Ph.D.
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2

Chowdhury, Sanchari. "Application of Luminescence Sensors in Oxygen Diffusion Measurement and Study of Luminescence Enhancement/Quenching by Metallic Nanoparticles." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1599.

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The first part of this dissertation deals with the application of a luminescence quenching method to measure diffusion and permeation coefficients of oxygen in polymers. Most luminescence oxygen sensors do not follow linearity of the Stern-Volmer (SV) equation due to heterogeneity of luminophore in the polymer matrix, thus the complexity of data analysis is increased. To circumvent this limitation, inverted fluorescence microscopy is utilized in this work to investigate the SV response of the sensors at the micron-scale. In these diffusion experiments, oxygen concentration is measured by luminescence changes in regions with high SV constants and good linearity. Thus, we avoid numerical complexity of combining nonlinear SV equation with a diffusion model. This technique allows us to measure oxygen diffusion properties in different type of polymers like transparent, opaque, free-standing polymers and polymers that cannot be cast into free standing films and polymer composites. In the second part of this thesis, we have explored the effect of Ag-Cu alloy nanoparticles on the emission intensity of luminophores at their close proximity. Alloy nanoparticles offer additional degrees of freedom for tuning their optical properties by altering atomic composition and atomic arrangement and thus can be an attractive option for manipulating signal of a wide range of luminophores. In this work, surface plasmon resonance spectrum of Ag-Cu alloy nanoparticles deposited by sputtering was easily tuned in wide wavelength range by varying one experimental condition- annealing temperature. Large metal enhanced luminescence for different luminophores viz Alexa Fluor 594 and Alexa Fluor 488 were achieved at the vicinity of Ag-Cu nanoparticles when maximum spectral overlap between SPR spectra of Ag-Cu nanoparticles and the emission and absorption spectra of the luminophores occur. We also studied the effect of composition of Ag-Cu nanoparticles synthesized by the polyol process on the luminescence of low quantum yield dye Cy3. In the third part of this thesis, quenching effect of Cu nanoparticles on CdSe/ZnS nanocrystal quantum dots has been explored. As Cu nanoparticles have comparable dielectric properties with gold nanoparticles, they are expected to show similar quenching effects. It was found that Cu is an efficient quencher of fluorescence from CdSe/ZnS quantum dots and the quenching effect is due to resonance energy transfer from quantum dots to Cu nanoparticles.
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Gao, Yuan. "Design of rare-earth-doped inorganic phosphors and luminescence enhancement by plasmonic effects." Kyoto University, 2020. http://hdl.handle.net/2433/253288.

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Kang, Ji-Hwan. "Energy transfer enhancement of photon upconversion systems for solar energy harvesting." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45846.

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Photon energy upconversion (UC), a process that can convert two or more photons with low energy to a single photon of higher energy, has the potential for overcoming the thermodynamic efficiency limits of sunlight-powered devices and processes. An attractive route to lowering the incident power density for UC lies in harnessing energy transfer through triplet-triplet annihilation (TTA). To maximize energy migration in multicomponent TTA-assisted UC systems, triplet exciton diffusivity of the chromophores within an inert medium is of paramount importance, especially in a solid-state matrix for practical device integration. In this thesis, low-threshold sensitized UC systems were fabricated and demonstrated by a photo-induced interfacial polymerization within a coaxial-flow microfluidic channel and in combination with nanostructured optical semiconductors. Dual-phase structured uniform UC capsules allow for the highly efficient bimolecular interactions required for TTA-based upconversion, as well as mechanical strength for integrity and stability. Through controlled interfacial photopolymerization, diffusive energy transfer-driven photoluminescence in a bi-molecular UC system was explored with concomitant tuning of the capsule properties. We believe that this core-shell structure has significance not only for enabling promising applications in photovoltaic devices and photochromic displays, but also for providing a useful platform for photocatalytic and photosensor units. Furthermore, for improving photon upconverted emission, a photonic crystal was integrated as an optical structure consisting of monodisperse inorganic colloidal nanoparticles and polymer resin. The constructively enhanced reflected light allows for the reuse of solar photons over a broad spectrum, resulting in an increase in the power conversion efficiency of a dye-sensitized solar cell as much as 15-20 %.
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Tahhan, Abdulla. "Energy performance enhancement of crystalline silicon solar cells." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/14503.

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The work in this thesis examines the effects of the application of oxide coatings on the performance of the single crystalline silicon photovoltaic solar cells. A variety of potential oxide materials for solar cells performance enhancement are investigated. These films are silicon oxide, titanium oxide and rare earth ion-doped gadolinium oxysulfide phosphor. This study compares the electrical characteristics, optical properties and surface chemical composition of mono-crystalline silicon cells before and after coating. The first study investigates the potential for using single and double layers of silicon oxide films produced by low-temperature Plasma Enhanced Chemical Vapour Deposition (PECVD) using tetramethylsilane as a silicon precursor and potassium permanganate oxidising agent for efficiency enhancement of solar cells at low manufacturing cost. Deposition of the films contributes to the increase of the conversion energy of the solar cells on one hand while the variety of colours obtained in this study can be of great importance for building-integrated photovoltaic application on the other hand. The obtained results demonstrated a relative enhancement of 3% in the conversion efficiency of the crystalline silicon solar cell. In the second study, the effects of using a single layer of titanium oxide and a stack of silicon oxide and titanium oxide on the performance of solar cell are demonstrated. Moreover, this study shows the use of different sputtering configurations and oxidation methods. The experimental results showed a relative enhancement of 1.6% for solar cells coated with a stack of silicon oxide/titanium oxide. In the third study, silicon cells were coated with a luminescent layer consisting of down-converting phosphor, gadolinium oxysulfide doped with erbium and terbium, and a polymeric binder of EVA using doctor-blade screen printing technique. A relative enhancement of 4.45% in the energy conversion efficiency of PV solar cell was achieved. Also, the effects of combining silicon oxide layers together with the luminescent composite are also presented in this study.
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Hosseinzadeh, Mani. "Enhancement of Luminescence Properties of Cu(I) Based Materials." Doctoral thesis, 2021. http://hdl.handle.net/10362/130155.

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The purpose of this thesis is to investigate the photophysical behaviour of three distinct families of Cu(I) complexes. The distinction is done by three different type of ligands but in all cases the coordination core consists of dinuclear iodide bridged {Cu2(μ-I)2} cluster surrounded by either diimino-, phosphino- or imino-phosphino- (N^N,P,P^N) ligands. All compounds were fully characterized by spectroscopic methods, with special emphasis on their structural features revealed by X-Ray single crystal diffraction and photophysical properties supported by computational calculations. The first family consists of two new complexes bearing α-diimine (Ar-BIAN) ligands functionalized by a nitro group which were compared to the analogue non-functionalized complex. The ground state analysis clarifies the difference between the molecular structures observed within the crystals and the determining role of packing forces. TD-DFT revealed (M+X)LCT (Metal and Halide to Ligand Charge Transfer) absorption bands in the visible with some n→π* character involving stabilized π* orbitals by the presence of NO2. Dynamics of the excited state of all three complexes and of their respective free ligands were examined by Transient Absorption Spectroscopy in the femtosecond time domain allowing to probe the dark states involved in the kinetic pathways followed by excited Cu(I) complexes and the role of ligands structure in the non-radiative decays. The second family includes two new emissive dinuclear Cu(I) complexes bearing terphenyl phosphines. The photophysical behavior of these compounds in liquid solution, solid−solid Zeonex solution and powder samples were investigated at room temperature and 77 K. The steady state and time-resolved emission measurements along with group theory calculations allowed to postulate a luminescence mechanism conditioned by crystal packing. The third family comprised of two new iminophosphine-based complexes, which combine imine and phosphine properties in a sole structure supporting the suggested mechanistic pathways hypothesized for the two first compound families.
A investigação científica realizada no âmbito desta tese de Doutoramento põe em foco o comportamento fotofísico de três famílias distintas de complexos de Cu(I). O que faz a distinção entre as famílias é o tipo do ligando sendo diimino-, fosfino- ou imino-fosfino- (N^N,P,P^N) respetivamente tendo todas em comum o cerne {Cu2(μ-I)2}, um fragmento binuclear de Cu(I) com Iodetos em ponte. Todos os compostos foram completamente caracterizados recorrendo às técnicas espectroscópicas com especial ênfase na Cristalografia de Raios-X para a caracterização estrutural e nos Cálculos Teóricos para melhor compreensão do comportamento fotofísico. A primeira família consiste em dois novos complexos contendo ligandos α-diimina (Ar-BIAN) funcionalizados com o grupo nitro que foram comparados com o complexo homólogo não-funcionalizado. Foram abordadas as diferenças estruturais na fase cristalina realçando o papel determinante que o empacotamento cristalino exerce na geometria que as moléculas adoptam no estado fundamental. TD-DFT revelou a natureza das bandas de absorção na região visível sendo (M+X)LCT com algum caráter n→π* com orbitais π* estabilizadas pelo grupo NO2. A dinâmica do estado excitado dos complexos bem como a dos ligandos livres foi estudada recorrendo à Espectroscopia de Absorção Resolvida no Tempo na escala de femtosecundos a fim de sondar os estados escuros envolvidos na cinética do estado excitado e a influência da estrutura dos ligandos no decaimento não radiativo. A segunda família engloba dois novos complexos com ligandos terfenilfosfina. O comportamento fotofísico em solução, em filmes de Zeonex e em pó foi investigado a 300 e 77 K. A emissão de luz no estado estacionário e resolvida no tempo juntamente com a Teoria dos Grupos permitiram postular um mecanismo de luminescência condicionada pelo empacotamento cristalino. A terceira família é composta de dois novos complexos baseados em ligandos iminofosfina que combinando as propriedades de iminas e de fosfinas na mesma estrutura irão apoiar os mecanismos sugeridos para explicar o comportamento fotofísico das duas primeiras famílias.
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ZHANG, DING-WEN, and 張丁文. "The Enhancement of Luminescence Intensity of Flexible Organic Light Emitting Diodes." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6uchgw.

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碩士
國立虎尾科技大學
光電工程系光電與材料科技碩士班
107
This paper has made use of spin-coating and evaporation processes to produce green fluorescent flexible organic light-emitting diodes, and its light-emitting area measures 1 cm x 1 cm. Firstly, PEDOT：PSS is added to the device structure to increase the injection capacity. At 8V, the luminance is increased to 232 cd/m2 and the efficiency is 0.33 cd/A. Then TPBi is added to increase the probability of recombination with electrons by limiting the hole in the emitting layer. When TPBi is 20 nm, the luminance increases to 413.9 cd/m2 at 8V, and the efficiency is 0.77 cd/A. Then, a layer of electron transport layer Alq3 is added to increase the recombination probability of the hole in the emitting layer. When the thickness of TPBi/Alq3 is 20 nm/15 nm, the luminance is 59.67 cd/m2 at a constant voltage of 8V, and the efficiency is 0.09 cd/A. When the thickness of PEDOT：PSS is increased in the device structure, the number of hole injections is increased, and the luminance and efficiency are improved. At a constant voltage of 8V, the luminance is increased from 232 cd/m2 to 1085 cd/m2, and the efficiency is increased from 0.33 cd/A to 2.05 cd/A. Then adjust the thickness of Alq3 layer. When the thickness of Alq3 layer decreases from 55 nm to 45 nm and TPBi layer is added, the experimental results show that the overall current decreases. It is inferred that the thickness of the barrier layer increases in order to reduce the thickness of the luminous layer, which affects the number of hole electron recombination in the luminous layer. At a constant voltage of 8V, the luminance is 95.5 cd/m2 and the efficiency is 0.7 cd/A. Titanium dioxide slurry with a thickness of 2.5 um was spin-coated on the back of ITO glass substrate to improve the light extraction efficiency. At voltage 8V, the luminance increased from 1072 cd/m2 to 1386 cd/m2, and the efficiency increased from 2.74 cd/A to 3.64 cd/A. Finally, a 10 nm NiO layer is added to the device as a buffer layer, which decreases the total current and improves the efficiency. The experimental results show that the efficiency is 2.83 cd/A.
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Tung, Kuan-Po, and 童冠博. "Strain-induced dramatic enhancement of single-molecule luminescence of conjugated polymers by nano-plastic flows." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/83747364387440019890.

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碩士
國立清華大學
材料科學工程學系
96
藉由添加少量共軛高分子(MEH-PPV)於非共軛高分子(PS)母體中，我們可以發現不同MEH-PPV添加比例之試片顯現了相當程度的稀釋效應(dilution effect)。之後，再經由拉伸過程使薄膜產生纖化之現象後，我們在MEH-PPV濃度較小的情形(0.1wt%、0.5wt%、1wt%)中發現其原始PL強度將會是未拉伸時試片的兩倍以上。此現象明顯與共軛高分子分子鏈之運動及其型態有密切的關連。經由初步之假設與計算，我們發現此種發光增益之行為大抵可由兩點來解釋。首先、在纖化區內部存在巨大的應變，而此應變在MEH-PPV含量不多的情況之下，可將MEH-PPV之分子鏈彼此分開，進而減少分子鏈之交互作用而增加其發光效率。在來就是此種巨大之應變亦有可能將纖化區中之分子鏈拉直，減低其結構缺陷，進一步地增加其發光效率。
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Fu, Shao-Siang, and 傅少祥. "Enhancement of p-GaN / n-ZnO LED luminescence by etching p-GaN and applying CdSe QD." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8ap9gv.

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碩士
國立臺灣海洋大學
光電科學研究所
107
In this paper, we successfully used commercially available (0001) p-GaN by hot phosphoric acid etching, and then sprayed zinc oxide on p-GaN using a self-made atmospheric plasma jet system to successfully produce an increase in luminous intensity. n-ZnO / p-GaN LED (blue light), blue light-emitting quantum dot fluorescent LED (red, green) and electrically excited quantum dot LED (red, green), and explore the optical properties of its light-emitting diode. Our experimental results can be divided into three parts: (1) We used different time to etch the p-GaN substrate with hot phosphoric acid, and spray the zinc oxide with a normal piezoelectric slurry to form a blue-light n-ZnO/p-GaN LED. We found that the sample etched for 30 minutes had the best electrical excitation (EL) luminescence intensity. (2) Using the above results, we used a CdSe/CdS/ZnS type quantum dot on the n-ZnO/p-GaN LED to form a blue-emitting quantum dot (red, green) fluorescent LED. Experiments have shown that blue-light-excited green quantum dot fluorescent LEDs are 2.5 times more efficient than pure n-ZnO/p-GaN LEDs. The brightness of the light is doubled under the bias of 20V. (3) Finally, we tried to make an electrically excited quantum dot (red, blue) LED. The structure is p-GaN / QDs / n-ZnO. The results show that the luminous efficiency of the electrically excited red light quantum dot LED is higher than that of the blue light excited red light quantum dot LED, which is up to 26.7 times higher; the green light luminous efficiency is increased by 3.4 times. The luminous intensity of the electrically excited red light quantum dot LED is improved by 275% compared with the blue light excited red light quantum dot LED; while the green light portion is not improved, there is still much room for improvement in the display of the electroluminescent green light quantum dot LED process. We believe that the technology developed in this paper can produce LED under normal pressure, which not only reduces the manufacturing cost of LED, but also develops high-efficiency electroluminescent quantum dot LED and blue-emitting quantum dot LED, which can emit red, blue and green. Three kinds of color light can be used to develop new architecture LED and micro LED development, and there is still great potential for development in the future.
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Subiyanto, Iyan, and 蘇宜瑒. "Investigation of Luminescence Enhancement of Polymer Light Emitting Diodes by Introducing Gold Nanoparticles into Hole Transport Layer." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8kc89h.

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Books on the topic "Luminescence enhancement"

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Wu, Tao, You-Xuan Zheng, Giovanna Longhi, and Ga-Lai Law, eds. Chiral Organic Chromophoric Systems in the Enhancement of Circularly Polarized Luminescence. Frontiers Media SA, 2021. http://dx.doi.org/10.3389/978-2-88966-708-6.

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Book chapters on the topic "Luminescence enhancement"

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Hasegawa, Miki. "Lanthanide Luminescence Enhancement in Nanostructures by Coordination Chemistry." In Luminescent Nanomaterials, 129–61. New York: Jenny Stanford Publishing, 2022. http://dx.doi.org/10.1201/9781003277385-3.

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Yang, Su-Hua, and Yin-Hsuan Ling. "Luminescence Enhancement of Sky-Blue ZnS:Tm Phosphor by Promoter Doping." In Materials Processing Fundamentals, 265–72. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118662199.ch30.

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Yang, Su-Hua, and Yin-Hsuan Ling. "Luminescence Enhancement of Sky-Blue ZnS:Tm Phosphor by Promoter Doping." In Materials Processing Fundamentals, 267–72. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48197-5_30.

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Demchenko, Alexander P. "Evanescent Field Effects and Plasmonic Enhancement of Luminescence in Sensing Technologies." In Introduction to Fluorescence Sensing, 503–29. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60155-3_13.

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Fery-Forgues, Suzanne, and Corinne Vanucci-Bacqué. "Recent Trends in the Design, Synthesis, Spectroscopic Behavior, and Applications of Benzazole-Based Molecules with Solid-State Luminescence Enhancement Properties." In Topics in Current Chemistry Collections, 129–69. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89933-2_5.

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Ayala Barragan, Maria F., Subhash Chandra, Bill Cass, and Sarah J. McCormack. "Defining Critical Parameters in a Luminescent Downshifting Layer for PV Enhancement." In Innovative Renewable Energy, 865–70. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-76221-6_96.

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Li, Juan, Yong Jun Wu, and Makoto Kuwabara. "Enhancement of Luminescent Properties of Sol-Gel-Derived BaTiO3: Pr." In Electroceramics in Japan VIII, 197–200. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-982-2.197.

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"Peroxynitrite-Based Luminol Luminescence of Macrophages and Enhancement of the Signal." In Luminescence Biotechnology, 387–402. CRC Press, 2001. http://dx.doi.org/10.1201/9781420041804-29.

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Van Dyke, Knox, Michael Taylor, Paul McConnell, and Mark Reasor. "Enhancement of Luminol-Dependent Peroxynitrite Luminescence in Dishes and Tubes from Various Macrophages." In Luminescence Biotechnology, 409–15. CRC Press, 2001. http://dx.doi.org/10.1201/9781420041804.ch30.

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"Enhancement of Luminol-Dependent Peroxynitrite Luminescence in Dishes and Tubes from Various Macrophages: Rat Alveolar Macrophages Apparently Display a New Oxidative Mechanism." In Luminescence Biotechnology, 431–38. CRC Press, 2001. http://dx.doi.org/10.1201/9781420041804-33.

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Conference papers on the topic "Luminescence enhancement"

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Ruan, Xiulin, and Massoud Kaviany. "Temperature-Dependent Luminescence Quenching in Random Nano Porous Media." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60363.

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Abstract:
The luminescence quenching of a random, crystalline one-dimensional model porous medium doped with rare-earth elements, is analyzed by considering the transport, transition, and interaction of the fundamental energy carriers. The quenching in nano porous media is enhanced compared to a single crystal, due to multiple scattering, enhanced absorption, and low thermal conductivity. The coherent wave treatment is used to calculate the photon absorption, in order to allow for field interference and enhancement. The luminescent and thermal emission is considered as incoherent. The luminescence quenching and non-linear thermal emission, occurring with increasing irradiation intensity, are predicted.
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Rutckaia, Viktoriia, Vadim Talalaev, Frank Heyroth, Alexey Novikov, Mikhail Y. Shaleev, Mihail Petrov, Dominik Schulze, and Joerg Schilling. "Luminescence enhancement by collective Mie-resonances." In Active Photonic Platforms XI, edited by Ganapathi S. Subramania and Stavroula Foteinopoulou. SPIE, 2019. http://dx.doi.org/10.1117/12.2528493.

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Lin, Li, Flemming Jensen, Berit Herstrøm, and Haiyan Ou. "Luminescence enhancement of near ultraviolet light-emitting diodes." In Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/acpc.2016.as1f.4.

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Wang, Jigang, Ryan Hall, Lun Ma, Wei Chen, Renfei Feng, Ramaswami Sammynaiken, Yongsheng Wang, and Dawei He. "Luminescence enhancement in LaPO4:Ce/CdTe nanocomposite scintillators." In SPIE Defense, Security, and Sensing, edited by Thomas George, M. Saif Islam, and Achyut K. Dutta. SPIE, 2013. http://dx.doi.org/10.1117/12.2015879.

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Sun, G., J. B. Khurgin, and R. A. Soref. "Enhancement of luminescence efficiency using surface plasmon polaritons." In 2007 Quantum Electronics and Laser Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/qels.2007.4431556.

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Piatkowski, D., K. Ciszak, A. Prymaczek, J. Grzelak, M. Nyk, and S. Mackowski. "Luminescence enhancement and energy propagation in plasmonic networks." In 2015 17th International Conference on Transparent Optical Networks (ICTON). IEEE, 2015. http://dx.doi.org/10.1109/icton.2015.7193634.

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Berthelot, A., S. Derom, N. Abdellaoui, O. Benamara, A. Pillonnet, A. Pereira, G. Colas des Francs, B. Moine, and A. M. Jurdyc. "Plasmonic enhancement of lanthanides luminescence using metallic nanoparticles." In SPIE OPTO, edited by Michel J. F. Digonnet and Shibin Jiang. SPIE, 2014. http://dx.doi.org/10.1117/12.2046768.

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Sun, G., and J. B. Khurgin. "Analytical model for luminescence enhancement by metal nanoparticles." In 2013 International Conference on Microwave and Photonics (ICMAP). IEEE, 2013. http://dx.doi.org/10.1109/icmap.2013.6733452.

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Serpengüzel, Ali. "Enhancement of luminescence in amorphous semiconductors by microcavity effects." In 17th Congress of the International Commission for Optics: Optics for Science and New Technology. SPIE, 1996. http://dx.doi.org/10.1117/12.2315991.

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Walter, Daniel, Anyao Liu, Evan Franklin, Daniel Macdonald, Bernhard Mitchell, and Thorsten Trupke. "Contrast enhancement of luminescence images via point-spread deconvolution." In 2012 IEEE 38th Photovoltaic Specialists Conference (PVSC). IEEE, 2012. http://dx.doi.org/10.1109/pvsc.2012.6317624.

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Reports on the topic "Luminescence enhancement"

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Alers, Glenn. Luminescent Enhancement for Combined Solar and Agriculture. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1604469.

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Song, Kwang. Molecularly Targeted Dose-Enhancement Radiotherapy Using Gold and Luminescent Nanoparticles in an Orthotopic Human Prostate Cancer Rat Model. Fort Belvoir, VA: Defense Technical Information Center, October 2013. http://dx.doi.org/10.21236/ada596724.

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