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Journal articles on the topic 'Photoluminescent semiconductor nanocrystals'

Author: Grafiati

Published: 6 September 2023

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1

Roland Menzel, E., Steve M. Savoy, Sydney J. Ulvick, Kwan H. Cheng, Russell H. Murdock, and Mark R. Sudduth. "Photoluminescent Semiconductor Nanocrystals for Fingerprint Detection." Journal of Forensic Sciences 45, no. 3 (May 1, 2000): 14727J. http://dx.doi.org/10.1520/jfs14727j.

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2

Marin, Brandon C., Su-Wen Hsu, Li Chen, Ashley Lo, Darwin W. Zwissler, Zhaowei Liu, and Andrea R. Tao. "Plasmon-Enhanced Two-Photon Absorption in Photoluminescent Semiconductor Nanocrystals." ACS Photonics 3, no. 4 (March 25, 2016): 526–31. http://dx.doi.org/10.1021/acsphotonics.6b00037.

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3

Martin-Trasanco, Rudy, Hilda Esparza-Ponce, Pedro Ortiz, Diego Oyarzun, Cesar Zuñiga, Maria Montero-Cabrera, Alain Tundidor-Camba, Guadalupe Pizarro, and Ramiro Arratia-Pérez. "In-Situ Preparation of CdTe Quantum Dots Capped with a β-Cyclodextrin-Epichlorohydrin Polymer: Polymer Influence on the Nanocrystal’s Optical Properties." Nanomaterials 8, no. 11 (November 17, 2018): 948. http://dx.doi.org/10.3390/nano8110948.

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β-Cyclodextrin (βCD), the less water soluble of the cyclodextrins, has been used as a capping agent in the preparation of semiconductor nanocrystals or quantum dots (QDs). Nevertheless, no reports have been found in the use of the highly water-soluble polymer of this, prepared by the crosslinking of the βCD units with epichlorohydrin in basic medium (βCDP). This polymer, besides to overcome the low solubility of the βCD, increases the inclusion constant of the guest; two parameters that deserve its use as capping agent, instead of the native cyclodextrin. In the present manuscript, we afforded the in-situ aqueous preparation of cadmium telluride (CdTe) QDs capped with βCDP. The polymer influence on the photoluminescent properties of the nanocrystals was analyzed. The βCDP controls the nanocrystals growth during the Oswald ripening stage. Consequently, the CdTe capped βCDP QDs showed lower Stokes-shift values, higher photoluminescent efficiency, and narrower size distribution than for nanocrystals obtained in the absence of polymer. Transmission electron microscopy (TEM) micrographs and energy dispersive X-ray spectroscopy (EDS) analysis revealed the composition and crystallinity of the CdTe QDs. This βCDP capped CdTe QDs is a potential scaffold for the supramolecular modification of QDs surface.

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4

Guzatov, Dmitry V., Sergey V. Gaponenko, and Hilmi V. Demir. "Colloidal Photoluminescent Refractive Index Nanosensor Using Plasmonic Effects." Zeitschrift für Physikalische Chemie 232, no. 9-11 (August 28, 2018): 1431–41. http://dx.doi.org/10.1515/zpch-2018-1127.

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Abstract Fluorescence enhancement by metal nanostructures which is sensitive to refractive index n of an ambient medium is suggested as an operation principle of a novel refractive index sensor for liquids. Calculations are made for spherical and spheroidal Ag particles, and potential feasibility of sensitivity of the order of Δn=10−4 is demonstrated. Sensors of this type can be made fully colloidal with metal bodies deposited on a substrate or comprising a metal layer covering colloidal assembly of dielectric particles to serve as a test strip as well as placed on a fiber tip end to get local probing of refractive index in the tip-enhanced refractometry mode. Colloidal core-shell semiconductor nanocrystals may become the best candidates for this type of sensors whereas molecular probes may be affected by chemical properties of tested liquids.

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Nifontova, Galina, Victor Krivenkov, Mariya Zvaigzne, Anton Efimov, Evgeny Korostylev, Sergei Zarubin, Alexander Karaulov, Igor Nabiev, and Alyona Sukhanova. "Nanoparticle-Doped Hybrid Polyelectrolyte Microcapsules with Controlled Photoluminescence for Potential Bioimaging Applications." Polymers 13, no. 23 (November 24, 2021): 4076. http://dx.doi.org/10.3390/polym13234076.

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Fluorescent imaging is widely used in the diagnosis and tracking of the distribution, interaction, and transformation processes at molecular, cellular, and tissue levels. To be detectable, delivery systems should exhibit a strong and bright fluorescence. Quantum dots (QDs) are highly photostable fluorescent semiconductor nanocrystals with wide absorption spectra and narrow, size-tunable emission spectra, which make them suitable fluorescent nanolabels to be embedded into microparticles used as bioimaging and theranostic agents. The layer-by-layer deposition approach allows the entrapping of QDs, resulting in bright fluorescent microcapsules with tunable surface charge, size, rigidity, and functional properties. Here, we report on the engineering and validation of the structural and photoluminescent characteristics of nanoparticle-doped hybrid microcapsules assembled by the deposition of alternating oppositely charged polyelectrolytes, water-soluble PEGylated core/shell QDs with a cadmium selenide core and a zinc sulfide shell (CdSe/ZnS), and carboxylated magnetic nanoparticles (MNPs) onto calcium carbonate microtemplates. The results demonstrate the efficiency of the layer-by-layer approach to designing QD-, MNP-doped microcapsules with controlled photoluminescence properties, and pave the way for the further development of next-generation bioimaging agents based on hybrid materials for continuous fluorescence imaging.

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6

Shen, Hao, Huabao Shang, Yuhan Gao, Deren Yang, and Dongsheng Li. "Efficient Sensitized Photoluminescence from Erbium Chloride Silicate via Interparticle Energy Transfer." Materials 15, no. 3 (January 30, 2022): 1093. http://dx.doi.org/10.3390/ma15031093.

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In this study, we prepare Erbium compound nanocrystals and Si nanocrystal (Si NC) co-embedded silica film by the sol-gel method. Dual phases of Si and Er chloride silicate (ECS) nanocrystals were coprecipitated within amorphous silica. Effective sensitized emission of Er chloride silicate nanocrystals was realized via interparticle energy transfer between silicon nanocrystal and Er chloride silicate nanocrystals. The influence of density and the distribution of sensitizers and Er compounds on interparticle energy transfer efficiency was discussed. The interparticle energy transfer between the semiconductor and erbium compound nanocrystals offers some important insights into the realization of efficient light emission for silicon-based integrated photonics.

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7

Pashchenko, G. A. "PHOTOLUMINESCENCE OF NANOCRYSTALLINE CdTe, INTRODUCED INTO POROUS SILICON." Optoelektronìka ta napìvprovìdnikova tehnìka 56 (December 7, 2021): 123–28. http://dx.doi.org/10.15407/iopt.2021.56.123.

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A method of colloidal synthesis of monodisperse nanocrystals (NC) with high stability, narrow bands of photoluminescence (PL) and high quantum yield has been developed. The process of colloidal synthesis took place at room temperature and for the passivation of NC used a variety of surfactants. The surface of NC CdTe was modified by introducing them into a matrix, organic or crystalline. In our case, the matrix was porous Silicon (PS), that is a composite structure was formed on the basis of the matrix and NC semiconductor. Nanocomposite structures of PS – NC CdTe were obtained by introducing colloidal solutions of NC CdTe into the solid matrix of PS and subsequent processing at a certain temperature regime. The photoluminescent properties of a composite system in which the matrix is microcrystalline PS and the second component is NC CdTe deposited from a colloidal solution of NC CdTe have been studied. The peculiarity of this system is that both components have PL of different intensities.The large difference in PL intensities and different positions of the radiation bands allowed, comparing the PL spectra of the colloidal solution of NC CdTe, PS and NC CdTe – PS at different stages of introduction of CdTe nanoparticles into the porous Silicon surface, to identify the interaction and mutual influence of the two constituent materials. The main disadvantages of the method are its relative novelty, which leads to the need for empirical selection of some parameters of the synthesis. The planned change of properties of PS and colloidal solutions of NC CdTe by variation of technological methods of synthesis and processing methods will allow to control the physical properties of this composite system and use it to develop new principles of design and creation of new generation sensor devices.

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8

Mohammadrezaee, Mohammad, Naser Hatefi-Kargan, and Ahmadreza Daraei. "Enhancing crystal quality and optical properties of GaN nanocrystals by tuning pH of the synthesis solution." Zeitschrift für Naturforschung A 75, no. 6 (May 26, 2020): 551–56. http://dx.doi.org/10.1515/zna-2019-0378.

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AbstractGallium nitride nanocrystals as a wide bandgap semiconductor material for optoelectronic applications can be synthesized using chemical methods. In this research using co-precipitation and nitridation processes gallium nitride nanocrystals have been synthesized, and by tuning pH of the synthesis solution at the co-precipitation step, crystal quality and optical property of the resultant gallium nitride nanocrystals have been enhanced. Gallium nitride nanocrystal samples were synthesized using solutions with pH values of 2.1, 4.8, 7.8, and 9.0, and then nitridation at 950 °C under the flow of ammonia gas. The synthesized nanocrystal samples were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and photoluminescence techniques. The XRD data show that the nanocrystals have hexagonal wurtzite crystal structure, and using Scherer’s equation the sizes of the synthesized nanocrystals are 23.6, 26.6, 19.7, and 10.4 nm for the samples synthesized using the solutions with pH values of 2.1, 4.8, 7.8, and 9.0 respectively. The sizes of the nanocrystals obtained from SEM images are larger than the values obtained using Scherer’s equation, due to the aggregation of nanocrystals. EDX spectra show that pH of the synthesis solution affects the elemental stoichiometry of the gallium nitride nanocrystals. We obtained better stoichiometry for the nanocrystal sample synthesized using solution with the pH of 4.8. Photoluminescence spectra show that for this sample the emission intensity is higher than the others.

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9

Ding, Yong Ling, Hua Dong Sun, Kang Ning Sun, and Fu Tian Liu. "Water-Based Route to Synthesis of High-Quality UV-Blue Photoluminescing ZnSe/ZnS Core/Shell Quantum Dots and their Physicochemical Characterization." Key Engineering Materials 680 (February 2016): 553–57. http://dx.doi.org/10.4028/www.scientific.net/kem.680.553.

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Epitaxially overgrowing a semiconductor material with higher bandgap around the QDs has proven to be a crucial approach for improving the PL efficiency and stability of nanocrystals. In this paper, a ZnS shell was deposited around ZnSe nanocrystal cores via a noninjection approach in aqueous media. The deposition procedure conducted at 100°C in a reaction flask in the presence of the shell precursor compounds, together with the crude ZnSe nanocrystal cores and the thiol ligand glutathione. The influences of various experimental variables, including the reaction time, amount of thiourea, as well as pH value, on the growth rate and luminescent properties of the obtained core/shell nanocrystals have been systematically investigated. In comparison with the original ZnSe nanocrystals, the PL efficiency of the obtained ZnSe/ZnS core/shell nanostructures can be improved significantly with a QY up to 62.8%.

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10

Sercel, Peter C., Andrew Shabaev, and Alexander L. Efros. "Symmetry Breaking Induced Activation of Nanocrystal Optical Transitions." MRS Advances 3, no. 14 (2018): 711–16. http://dx.doi.org/10.1557/adv.2018.19.

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ABSTRACTWe have analysed the effect of symmetry breaking on the optical properties of semiconductor nanocrystals due to doping by charged impurities. Using doped CdSe nanocrystals as an example, we show the effects of a Coulomb center on the exciton fine-structure and optical selection rules using symmetry theory and then quantify the effect of symmetry breaking on the exciton fine structure, modelling the charged center using a multipole expansion. The model shows that the presence of a Coulomb center breaks the nanocrystal symmetry and affects its optical properties through mixing and shifting of the hole spin and parity sublevels. This symmetry breaking, particularly for positively charged centers, shortens the radiative lifetime of CdSe nanocrystals even at room temperature, in qualitative agreement with the increase in PL efficiency observed in CdSe nanocrystals doped with positive Ag charge centers [A. Sahu et.al., Nano Lett. 12, 2587, (2012)]. The effect of the charged center on the photoluminescence and the absorption spectra is shown, with and without the presence of compensating charges on the nanocrystal surface. While spectra of individual nanocrystals are expected to shift and broaden with the introduction of a charged center, configuration averaging and inhomogeneous broadening are shown to wash out these effects. The presence of compensating charges at the NC surface also serves to stabilize the band edge transition energies relative to NCs with no charge centers.

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11

Yang, Fuqian. "Kinetic analysis of the growth of semiconductor nanocrystals from the peak wavelength of photoluminescence." European Physical Journal Applied Physics 97 (2022): 20. http://dx.doi.org/10.1051/epjap/2022210286.

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Understanding the rate processes controlling the growth of semiconductor nanocrystals in liquid solutions is of great importance in tailoring the sizes of semiconductor nanocrystals for the applications in optoelectronics, bioimaging and biosensing. In this work, we establish a simple relationship between the photoluminescence (PL) peak wavelength and the growth time of semiconductor nanocrystals under the condition that the contribution of electrostatic interaction to the quantum confinement is negligible. Using this relationship and the data available in the literature for CdSe and CdSe/ZnS nanocrystals, we demonstrate the feasibility of using the PL peak wavelength to analyze the growth behavior of the CdSe and CdSe/ZnS nanocrystals in liquid solutions. The results reveal that the diffusion of monomers in the liquid solution is the dominant rate process for the growth of CdSe/ZnS nanocrystals, and the activation energy for the growth of CdSe nanocrystals in the liquid solution is ∼9 kJ/mol. The feasibility to use this approach in the analysis of the thickness growth of core–shell nanocrystals with and without mechanical stress is also discussed. Such an approach opens a new avenue to in-situ monitor/examine the growth of semiconductor nanocrystals in liquid solutions.

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12

Xu, Rong Hui, Jiu Ba Wen, and Feng Zhang Ren. "Synthesis of CdS/CdCO₃ Core/Shell Structural Nanocrystals Potentially Used for Solar Cell via Hydrothermal Route." Applied Mechanics and Materials 79 (July 2011): 7–12. http://dx.doi.org/10.4028/www.scientific.net/amm.79.7.

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Synthesis of CdS/CdCO3Core/Shell semiconductor nanocrystals potentially used for solar cell via hydrothermal route is presented. Water-soluble crystallites with wurtzite crystal structure (CdS), hexagonal structure (CdCO3) with strong photoluminescence are prepared. The synthesis is based on the separation of the nucleation and growth stages of core and shell by controlling some crucial factors such as temperature, pH, ratio and concentration of reactant mixture. Bare wurtzite structural CdS nanocrystallites were synthesized by using cadmium acetate and thiourea as precursors. Ostwald ripening process under high temperature leads to high sample quality. Photoluminescence of nanocrystals with Core/Shell Structure and bare nanocrystals was compared and analysed. Nanocrystals with Core/Shell Structure have stabler performance of photoluminescence than CdS bare nanocrystallites because of the shell. Transmission electron microscopy and X-ray powder diffraction indicate the presence of bulk structural properties in crystallites as small as 5nm in diameter. X-ray Photoelectron Spectroscopy was used to characterize core/shell structure of as-prepared NCs. Ultra-stability and super strong photoluminescence emission of as-prepared CdS/CdCO3Core/Shell semiconductor nanocrystallites indicates its potentially practical value in NCs solar cell.

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13

Chamarro, M., C. Gourdon, and P. Lavallard. "Photoluminescence polarization of semiconductor nanocrystals." Journal of Luminescence 70, no. 1-6 (October 1996): 222–37. http://dx.doi.org/10.1016/0022-2313(96)00057-9.

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14

SHEN, M. Y., M. ODA, T. GOTO, and T. YAO. "DYNAMICAL PROCESS OF PHOTOIONIZATION IN SEMICONDUCTOR NANOCRYSTALS." International Journal of Modern Physics B 15, no. 28n30 (December 10, 2001): 3574–78. http://dx.doi.org/10.1142/s0217979201008184.

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When quantum dots (QDs) or nanocrystals (NCs) are photoionized, great changes of electric fields exerted on QDs occur, then photodarkening, photobrightening, and persistent hole burning effects may be macroscopically observed in QD system, and luminescence spectral diffusion and on/off behavior may be microscopically observed in a single QD. The dynamics of the emitted carrier from the QD by photoionization governs the properties of these phenomena. The photoionization process has been directly found in CdTe nanocrystals embedded in TOPO by measuring the temperature dependence of their photocurrent and photoluminescence. The phase transition of the matrix TOPO from amorphous solid to liquid makes the diffusion length of the emitted carriers outside the nanocrystals increase abruptly, resulting in a steep rise in both the photocurrent and the photoluminescence. Photoionization of a QD is fundamentally important to its optical properties

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15

Vacha, Martin, and Dharmendar Kumar Sharma. "Photophysics and electroluminescence of single nanocrystals of halide perovskites and related nanomaterials." EPJ Web of Conferences 190 (2018): 02012. http://dx.doi.org/10.1051/epjconf/201819002012.

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We report simultaneous photoluminescence and electroluminescence single-particle study of nanocrystals of inorganic halide perovskite CsPbBr3, as well as of ternary I-III-IV semiconductor quantum dots.

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16

Wang, Ying. "Luminescent CdTe and CdSe Semiconductor Nanocrystals: Preparation, Optical Properties and Applications." Journal of Nanoscience and Nanotechnology 8, no. 3 (March 1, 2008): 1068–91. http://dx.doi.org/10.1166/jnn.2008.18156.

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The novel optical and electrical properties of luminescent semiconductor nanocrystals are appealing for ultrasensitive multiplexing and multicolor applications in a variety of fields, such as biotechnology, nanoscale electronics, and opto-electronics. Luminescent CdSe and CdTe nanocrystals are archetypes for this dynamic research area and have gained interest from diverse research communities. In this review, we first describe the advances in preparation of size- and shape-controlled CdSe and CdTe semiconductor nanocrystals with the organometallic approach. This article gives particular focus to water soluble nanocrystals due to the increasing interest of using semiconductor nanocrystals for biological applications. Post-synthetic methods to obtain water solubility, the direct synthesis routes in aqueous medium, and the strategies to improve the photoluminescence efficiency in both organic and aqueous phase are discussed. The shape evolution in aqueous medium via self-organization of preformed nanoparticles is a versatile and powerful method for production of nanocrystals with different geometries, and some recent advances in this field are presented with a qualitative discussion on the mechanism. Some examples of CdSe and CdTe nanocrystals that have been applied successfully to problems in biosensing and bioimaging are introduced, which may profoundly impact biological and biomedical research. Finally we present the research on the use of luminescent semiconductor nanocrystals for construction of light emitting diodes, solar cells, and chemical sensors, which demonstrate that they are promising building blocks for next generation electronics.

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17

An, Li Min, Xuan Lin Chen, Xue Ting Han, Jie Yi, Chun Xia Liu, Wen Yu An, Yu Qiu Qu, et al. "CdSe/ZnO Core/Shell Semiconductor Nanocrystals: Synthesis and Characterization." Applied Mechanics and Materials 268-270 (December 2012): 207–10. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.207.

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CdSe/ZnO core/shell semiconductor nanocrystals which show high luminescence quantum yield have been synthesized through a simple routine without the use of any pyrophoric organometallic precursors. Transmission electron microscope image demonstrates the shape, monodispersity, average size, size distribution and core-shell structure of CdSe/ZnO nanocrystals. We use a combination of X-ray diffraction, UV-Vis absorption spectroscopy and photoluminescence to analyze the core/shell nanocrystals and determine their chemical composition, optical character and internal structure.

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18

Slyusarenko, Nina, Marina Gerasimova, Alexei Plotnikov, Nikolai Gaponik, and Evgenia Slyusareva. "Photoluminescence properties of self-assembled chitosan-based composites containing semiconductor nanocrystals." Physical Chemistry Chemical Physics 21, no. 9 (2019): 4831–38. http://dx.doi.org/10.1039/c8cp07051b.

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The photoluminescence (PL) properties of composites obtained by embedding green-emitting semiconductor nanocrystals (NCs) of two different types (thiol-capped CdTe and CdSe/ZnS) into chitosan-based biopolymer particles were investigated.

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19

Lam Tran, Thi Ngoc, Anna Szczurek, Stefano Varas, Cristina Armellini, Alessandro Carpentiero, Andrea Chiappini, Erica Iacob, et al. "Enhanced photorefractivity and rare-earth photoluminescence in SnO₂ nanocrystals-based photonic glass-ceramics." EPJ Web of Conferences 255 (2021): 05001. http://dx.doi.org/10.1051/epjconf/202125505001.

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This work presents state of the art rare-earth activated SnO2 nanocrystals - based transparent glass-ceramics. With combined enhancements in both photorefractivity and rare-earth photoluminescence, the glass-ceramic has unique benefits as a lasing material. It exhibits high photorefractivity with UV induced refractive index modifications in the order of 10-3. Exploiting its high photorefractivity, optical gratings are fabricated on the glass-ceramic under an energy-efficient direct UV writing process. Furthermore, SnO2 semiconductor nanocrystals are also employed as efficient rare-earth sensitizers enhancing drastically the rare-earth photoluminescence.

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20

Kamat, Prashant V., Jeffrey DuBose, and Anthoni Kipkorir. "Directing Energy and Electron Transfer Processes in Perovskite Nanocrystals." ECS Meeting Abstracts MA2022-01, no. 13 (July 7, 2022): 921. http://dx.doi.org/10.1149/ma2022-0113921mtgabs.

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The flow of energy and electron transfer processes in semiconductor nanocrystal based light harvesting assemblies is dictated by the nature of the excited state interactions. Surface interactions of chromophore or redox active molecule which dictate the efficiency of energy/electron transfer thus plays an important role in realizing their photocatalytic and optoelectronic applications. In this presentation we will two specific examples to show the flow of energy and electrons in CsPbBr3 nanocrystals. In the first case, the excited state interactions in the CsPbBr3-Rhodamine B (RhB) hybrid assembly are probed using photoluminescence (PL) and transient absorption measurements. PL studies reveal quenching of the CsPbBr3 emission with a concomitant enhancement of the fluorescence of RhB, indicating a singlet energy transfer mechanism. In the second case we will discuss the factors dictating the electron transfer between CsPbBr3 and surface bound viologen. The implications of electron transfer in photocatalytic applications will be discussed.

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21

Guo, Yating, Feng Gao, Pan Huang, Rong Wu, Wanying Gu, Jing Wei, Fangze Liu, and Hongbo Li. "Light-Emitting Diodes Based on Two-Dimensional Nanoplatelets." Energy Material Advances 2022 (February 7, 2022): 1–24. http://dx.doi.org/10.34133/2022/9857943.

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Colloidal semiconductor nanocrystals (NCs) attract significant interest in recent years due to their narrow and tunable emission wavelength in the visible range, as well as high photoluminescence quantum yield (PLQY), which are highly desired in display technologies. The high-quality NCs have been recognized as vital luminescent materials in realizing next-generation display devices. With further development, NCs with near-unity PLQY have been successfully synthesized through engineering of the core/shell heterostructure. However, as the external quantum efficiency (EQE) of the nanocrystal light-emitting diodes (LEDs) approaches the theoretical limit of about 20%, the low out-coupling factor proposes a challenge of enhancing the performance of a device when using the spherical QDs. Hence, the anisotropic NCs like nanoplatelets (NPLs) are proposed as promising solutions to improve the performance of nanocrystal LEDs. In this review, we will summarize the synthetic strategies of two-dimensional (2D) NPLs at first. Then, we will introduce fundamental concepts of LEDs, the main approaches to realize LEDs based on nanoplatelets, and the recent progress. Finally, the challenges and opportunities of LEDs based on anisotropic NCs are also presented.

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22

Manu, S., and M. Abdul Khadar. "Non-uniform distribution of dopant iron ions in TiO2 nanocrystals probed by X-ray diffraction, Raman scattering, photoluminescence and photocatalysis." Journal of Materials Chemistry C 3, no. 8 (2015): 1846–53. http://dx.doi.org/10.1039/c4tc02362e.

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The phenomenon of ‘self-purification’ is a real mechanism operative in nanocrystals and this should be taken into account while doping semiconductor nanocrystals with external impurities for practical applications.

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23

Krause, Michael M., Timothy G. Mack, Lakshay Jethi, Apostolos Moniodis, Jonathan D. Mooney, and Patanjali Kambhampati. "Unraveling photoluminescence quenching pathways in semiconductor nanocrystals." Chemical Physics Letters 633 (July 2015): 65–69. http://dx.doi.org/10.1016/j.cplett.2015.05.017.

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24

Cheng, Oscar Hsu-Cheng, Tian Qiao, Matthew Sheldon, and Dong Hee Son. "Size- and temperature-dependent photoluminescence spectra of strongly confined CsPbBr3 quantum dots." Nanoscale 12, no. 24 (2020): 13113–18. http://dx.doi.org/10.1039/d0nr02711a.

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Lead-halide perovskite nanocrystals (NCs) are receiving much attention as a potential high-quality source of photons due to their superior luminescence properties in comparison to other semiconductor NCs.

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25

del-Castillo, J., A. C. Yanes, J. Méndez-Ramos, and V. D. Rodríguez. "Luminescence of Nanostructured SnO2-SiO2 Glass-Ceramics Prepared Sol–Gel Method." Journal of Nanoscience and Nanotechnology 8, no. 4 (April 1, 2008): 2143–46. http://dx.doi.org/10.1166/jnn.2008.068.

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Nanostructured silica based glass-ceramics samples of composition (100 – x)SiO2-xSnO2, with x from 1 to 10, have been synthesized by thermal treatment of precursor sol–gel glasses. The average size of the obtained SnO2 nanocrystals, calculated by using the X-ray diffraction, can be predetermined by using well-controlled concentration of tin precursor. The mean radius ranging from 1.6 to 5.5 nm, is comparable to the exciton Bohr radius, corresponding to wide band-gap semiconductor quantum-dots in an insulator SiO2 glass. A spectroscopy study in terms of optical absorption and photoluminescence spectra has been carried out as a function of SnO2 concentration. Size-dependent red-shifts of excitation and emission bands, with increasing of tin precursor concentration, point to the quantum confinement effect. The nanocrystal sizes have been obtained and compared by using the Brus and Scherrer equations. The band gap increase is in agreement with results, based on the effective mass model. The recombination of conduction band electron with oxygen vacancies is proposed to explain the luminescence red-shift.

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26

Bera, Rajesh, Gahyeon Kim, Dongsun Choi, Jihye Kim, and Kwang Seob Jeong. "Beyond the Bandgap Photoluminescence of Colloidal Semiconductor Nanocrystals." Journal of Physical Chemistry Letters 12, no. 10 (March 8, 2021): 2562–69. http://dx.doi.org/10.1021/acs.jpclett.1c00142.

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27

Jun, Shinae, and Eunjoo Jang. "Interfused semiconductor nanocrystals: brilliant blue photoluminescence and electroluminescence." Chemical Communications, no. 36 (2005): 4616. http://dx.doi.org/10.1039/b509196a.

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28

Valenta, J., J. Dian, P. Gilliot, and B. H�nerlage. "Photoluminescence and Optical Gain in CuBr Semiconductor Nanocrystals." physica status solidi (b) 224, no. 1 (March 2001): 313–17. http://dx.doi.org/10.1002/1521-3951(200103)224:1<313::aid-pssb313>3.0.co;2-b.

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29

Lipatiev, A. S., G. Yu Shakhgildyan, M. P. Vetchinnikov, S. V. Lotarev, and V. N. Sigaev. "Laser-assisted formation of luminescent domains in metal- or semiconductor-doped silicate and phosphate glasses." Journal of Physics: Conference Series 2015, no. 1 (November 1, 2021): 012163. http://dx.doi.org/10.1088/1742-6596/2015/1/012163.

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Abstract In this study, silicate and phosphate glasses doped with Ag or CdS were exposed to femtosecond laser pulses and photoluminescence properties of the laser-written domains were investigated. Laser writing in phosphate glass doped with CdS was found to induce very weak photoluminescence, while laser-written domains in silicate glass had a comparatively high photoluminescence intensity, that was assigned to the formation of the sulphur vacancies in the CdS nanocrystals precipitated under the ultrafast laser pulses. Observed photoluminescence bands in Ag-containing glasses we assigned to the formation of different silver nanospecies which provide photoluminescence bands with the maxima at 685 and 600 nm in Ag-doped silicate and phosphate glasses, respectively.

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30

Guo, Xiu Chun, and Wen Hui Zhou. "Controlled Synthesis and Optical Properties of CuInS₂ Nanocrystals." Applied Mechanics and Materials 716-717 (December 2014): 175–79. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.175.

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A facile method for the synthesis of size-and shape-controlled CuInS2 semiconductor nanocrystals was developed by thermolysis of a mixed solution of Cu (acac)2, In (acac)3 and dodecanethiol at 200 °C. By adjusting the reaction time, CuInS2 nanocrystals with size of ~2 to ~6 nm were obtained. The as-prepared nanocrystals were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis absorption and photoluminescence (PL) spectroscopy. The nanocrystals solutions exhibit tunable absorption and PL spectra with the absorption edge ranging from 450 to 750 nm while the PL emission peaks from 660 to 700, indicting a strong size-dependent quantum confinement effect. The proposed synthesis strategy developed in this work may be used as a general process for other metal chalcogenides nanocrystals and may have a bright application prospects in different areas, such photovoltaic application, in the future.

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31

Zenkevich, E., T. Blaudeck, M. Abdel-Mottaleb, F. Cichos, A. Shulga, and C. von Borczyskowski. "Photophysical properties of self-aggregated porphyrin: semiconductor nanoassemblies." International Journal of Photoenergy 2006 (2006): 1–7. http://dx.doi.org/10.1155/ijp/2006/90242.

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Colloidal semiconductor nanocrystals from CdSe show photoluminescence quenching via titration with porphyrin derivatives. This quenching is an indication of the formation of nanoassemblies via surface attachment of pyridyl linker groups. As a consequence of the complex formation, dynamic and/or static interactions between QD and porphyrins are induced. Quenching efficiencies depend critically on sample stability, temperature, solvent, and electronic properties of the porphyrins. In order to optimize photoinduced dynamic processes these parameters have to be under control.

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32

Sarma, D. D., Angshuman Nag, Pralay K. Santra, Akshay Kumar, Sameer Sapra, and Priya Mahadevan. "Origin of the Enhanced Photoluminescence from Semiconductor CdSeS Nanocrystals." Journal of Physical Chemistry Letters 1, no. 14 (June 30, 2010): 2149–53. http://dx.doi.org/10.1021/jz100698m.

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33

Zhong, Qiu-Lin, Ming-Rui Tan, Qing-Hui Liu, Ning Sui, Ke Bi, Mou-Cui Ni, Ying-Hui Wang, and Han-Zhuang Zhang. "Photoluminescence Characteristics of ZnCuInS-ZnS Core-Shell Semiconductor Nanocrystals." Chinese Physics Letters 34, no. 4 (March 2017): 047801. http://dx.doi.org/10.1088/0256-307x/34/4/047801.

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34

Tanaka, Masanori. "Photoluminescence properties of Mn2+-doped II–VI semiconductor nanocrystals." Journal of Luminescence 100, no. 1-4 (December 2002): 163–73. http://dx.doi.org/10.1016/s0022-2313(02)00448-9.

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35

Zhao, Jialong, Kai Dou, Shaozhe Lu, Yinmin Chen, Shihua Huang, Jiaqi Yu, Weidong Xiang, and Zishang Ding. "Photoluminescence of CdS semiconductor nanocrystals in sodium borosilicate glasses." Journal of Materials Science Letters 15, no. 8 (1996): 702–5. http://dx.doi.org/10.1007/bf00264120.

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36

Stolyarchuk, І. D. "Magneto-Optical Properties of CdMnTe Diluted Magnetic Semiconductor Nanoparticles Prepared by Physical Methods." Фізика і хімія твердого тіла 16, no. 2 (June 15, 2015): 297–301. http://dx.doi.org/10.15330/pcss.16.2.297-301.

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Nanoparticles of Cd1-xMnxTe have been studied by optical absorption and photoluminescence in applied magnetic field. The pulsed laser deposition technique and ball milling were used for fabrication of the samples of diluted magnetic semiconductor nanocrystals. The performed transmission electron microscopy (TEM) analysis suggests of spherical shape of nanostructures. In optical absorption spectra of the Cd1-xMnxTe nanoparticles short wavelength shift of the absorption edge due to confinement effect has been observed. In magnetic field shifts of the absorption spectra and maximum of the peak of photoluminescence towards long wavelength was observed due to the strong spin-exchange interaction between band carriers and magnetic ions. The linear magnetic field dependence of the Zeeman shifts of the maximum of photoluminescence for nanoparticles with low mangan content suggest of increase of the role pairs and antiferromagnetic interaction between Mn2+ ions

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37

Doskaliuk, N. M., Y. V. Babyuk, O. O. Tynkevych, A. V. Sachko, and Y. B. Khalavka. "Influence of the cationic composition on the optical properties and photostability of AgInS2 and AgInS2/ZnS quantum dots." Chernivtsi University Scientific Herald. Chemistry, no. 827 (2020): 7–15. http://dx.doi.org/10.31861/chem-2020-827-1.

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Semiconductor I-III-VI nanocrystals are highly luminescent low toxic materials with direct band gap and tunable emission in visible and near infrared region which can be synthesized in aqueous media via simple procedure making them competitive object in compare with well developed and investigated II-VI quantum dots. However the nature of radiative recombination pathways definition and effect of synthesis conditions on spectral characteristics of the nanocrystals investigation remains an important task. In the present work influence of the cation precursors ratio as well as the heat treatment duration on the composition, optical properties and photostability of AgInS2 and AgInS2/ZnS nanocrystals synthesized in aqueous media have been investigated. Due to the low reactivity of indium salts in aqueous solution coused by formation of a stable complexes with stabilizer or hydroxycomplexes the nearest stoichiometric Ag1,1InSx quantum dots are formed at the initial [In]:[Ag] ratio 7:1. Under high excess of Ag formation of Ag2S/AgInS2 core/shell quantum dots confirming by presence of large 12-15 nm nanocrystals and red shift of the photoluminescence maximum with increasing [In]:[Ag] ratio from 1 to 3 (shell thickness should increase proportionally) is possible. With a further increase of the [In]:[Ag] ratio the absorption edge and the photoluminescence maximum are green shifted indicating increase of the quantum dots band energy. That can be explained by lowering of the valence band ceiling energy and rising of the conduction band bottom energy due to decrease of density of states of Ag 4d orbitals and increase of density of states of In 5s and 5p orbitals involved in the AgInS2 band gap formation. Increase of Indium content leads to significant increase of the photoluminescence intensity of AgInS2 nanocrystals eliminating nonradiative defects such as Agi. It have been shown that the ZnS shell epitaxial grow occurs due to the cation exchange between Zn2+ and In3+ and takes place only at low concentration of Zinc precursor ([Zn]:[Ag] ≤ 4). With further enhancement of the ratio the solid solution of AgInS2-ZnS is forming. To achieve the highest possible photoluminescence intensity and energy the AgInS2-ZnS nanocrystals should be heated at 950C at least for 120 minutes. It have been shown that the nearly stoichiometric Ag1,1InSx nanocrystals posess the highest photostability under UV light irradiation.

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38

Ahamad, Tansir, and Saad M. Alshehri. "Synthesis of CdS Nanocrystals Using Polymer Metal Complex as a Single Source Precursor and their Physicochemical Properties." Nano Hybrids 1 (May 2012): 45–56. http://dx.doi.org/10.4028/www.scientific.net/nh.1.45.

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Polymeric ligand (TSCF) have been synthesized via polycondansation of thiosemicarbazide with formaldehyde and its polymer metal complex [TSCF-Cd (II)] has been prepared with Cd (II) ion. Two different batches of CdS chalcogenide, semiconductor nanocrystals have been synthesized by hydrothermal treatment of TSCF-Cd (II)] using a glass Q tube reactor at 200 °C and 250 °C, and marked as (CdS)1and (CdS)2respectively. The resultant nanocrystals were characterized by a variety of methods for thier physochemcial properties. The TEM micrographs showed well-defined, close to hexagonal particles, and the lattice fringes in the HRTEM images confirmed their crystalline nature. The sizes of (CdS)1and (CdS)2were 40 and 50 nm respectively but their morphologies were similar. The optical band gap energies (2.52 eV/ 2.48 eV) and photoluminescence peaks (532/534 nm) of the synthesized CdS nanocrystals suggest that they can be promising photocatalysts. The conductivities and the dielectric constants of the CdS nanocrystals were also studied and the activation energy value of (CdS)1and (CdS)2nanocrystals were found to be 0.64 eV and 0.70 eV.

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39

Marchioro, Arianna. "Recent Advances in Understanding Delayed Photoluminescence in Colloidal Semiconductor Nanocrystals." CHIMIA International Journal for Chemistry 71, no. 1 (February 22, 2017): 13–17. http://dx.doi.org/10.2533/chimia.2017.13.

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40

Osad’ko, I. S. "Power-law statistics of intermittent photoluminescence in single semiconductor nanocrystals." Journal of Experimental and Theoretical Physics Letters 79, no. 9 (May 2004): 416–19. http://dx.doi.org/10.1134/1.1776234.

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41

Murase, Norio, and Ping Yang. "Anomalous Photoluminescence in Silica-Coated Semiconductor Nanocrystals After Heat Treatment." Small 5, no. 7 (April 6, 2009): 800–803. http://dx.doi.org/10.1002/smll.200801302.

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42

Lang, X. Y., W. T. Zheng, and Q. Jiang. "Finite-Size Effect on Band Structure and Photoluminescence of Semiconductor Nanocrystals." IEEE Transactions on Nanotechnology 7, no. 1 (January 2008): 5–9. http://dx.doi.org/10.1109/tnano.2007.913426.

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43

CHEN, Sheng, XuDong HE, Rong HE, and Jie ZENG. "Metal-semiconductor hybrid nanocrystals: Controlled synthesis, plasmonic modulation and photoluminescence properties." Scientia Sinica Chimica 43, no. 6 (2013): 667. http://dx.doi.org/10.1360/032013-78.

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44

White, Michael A., Amanda L. Weaver, Rémi Beaulac, and Daniel R. Gamelin. "Electrochemically Controlled Auger Quenching of Mn2+ Photoluminescence in Doped Semiconductor Nanocrystals." ACS Nano 5, no. 5 (April 11, 2011): 4158–68. http://dx.doi.org/10.1021/nn200889q.

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45

Freyer, Abigail R., Peter C. Sercel, Zhentao Hou, Benjamin H. Savitzky, Lena F. Kourkoutis, Alexander L. Efros, and Todd D. Krauss. "Explaining the Unusual Photoluminescence of Semiconductor Nanocrystals Doped via Cation Exchange." Nano Letters 19, no. 7 (June 14, 2019): 4797–803. http://dx.doi.org/10.1021/acs.nanolett.9b02284.

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46

Malainho, E., J. R. Santos, M. I. Vasilevskiy, S. A. Filonovich, Y. P. Rakovich, and A. Rogach. "Cascade upconversion of photoluminescence in ensembles of II-VI semiconductor nanocrystals." physica status solidi (c) 7, no. 6 (March 31, 2010): 1517–19. http://dx.doi.org/10.1002/pssc.200983256.

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47

Ferry, Vivian. "(Invited, Digital Presentation) Circularly Polarized Photoluminescence from Nanostructured Arrays of Light Emitters." ECS Meeting Abstracts MA2022-01, no. 20 (July 7, 2022): 1085. http://dx.doi.org/10.1149/ma2022-01201085mtgabs.

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Metasurfaces offer compact routes to spatial and polarization control of luminescence from nearby emitters. The most common integration strategy is to coat a patterned metamaterial or metasurface with a film of light emitting material. For example, structures such as arrays of Au nanorods coated with achiral light emitters exhibit circularly polarized photoluminescence at specific outcoupled angles. However, the degree of circular polarization in these systems is limited to relatively low values, and does not coincide with the angles with high photoluminescence intensity. This talk will discuss an alternative strategy, where the light emitters are patterned instead. We show that this structure offers several advantages: rather than averaging over the contributions of emitters in many different locations, this system exhibits highly directional photoluminescence with high degrees of circular polarization. Most importantly, the photoluminescence intensity is high at the same angles where the degree of circular polarization is high. These patterned light-emitting nanostructures are formed using direct-write electron beam lithography on semiconductor nanocrystals. This versatile method is capable of forming structures with aspect ratios greater than 2 and feature sizes as small as 30 nm, photoluminescence is retained after patterning, and the system is robust to multiple patterning steps.

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48

Osad’ko, I. S. "Model for power-law statistics in blinking photoluminescence of single semiconductor nanocrystals." Chemical Physics 316, no. 1-3 (September 2005): 99–107. http://dx.doi.org/10.1016/j.chemphys.2005.04.044.

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49

Zhou, Ding, Jishu Han, Yi Liu, Min Liu, Xue Zhang, Hao Zhang, and Bai Yang. "Nucleation of Aqueous Semiconductor Nanocrystals: A Neglected Factor for Determining the Photoluminescence." Journal of Physical Chemistry C 114, no. 51 (December 9, 2010): 22487–92. http://dx.doi.org/10.1021/jp108708n.

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50

Filonovich, Sergey A., Yurii P. Rakovich, Mikhail I. Vasilevskiy, Mikhail V. Artemyev, Dmitrii V. Talapin, Andrey L. Rogach, Anabela G. Rolo, and Maria J. M. Gomes. "Probing the Exciton Density of States in Semiconductor Nanocrystals Using Integrated Photoluminescence Spectroscopy." Monatshefte f�r Chemie / Chemical Monthly 133, no. 6 (June 1, 2002): 909–18. http://dx.doi.org/10.1007/s007060200061.

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