Academic literature on the topic 'Up-conversion photoluminescence'

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Journal articles on the topic "Up-conversion photoluminescence"

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Morozov, Yurii V., Shubin Zhang, Michael C. Brennan, Boldizsar Janko, and Masaru Kuno. "Photoluminescence Up-Conversion in CsPbBr3 Nanocrystals." ACS Energy Letters 2, no. 10 (October 5, 2017): 2514–15. http://dx.doi.org/10.1021/acsenergylett.7b00902.

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Wagner, Matthias, Ivan G. Ivanov, L. Storasta, Peder Bergman, Björn Magnusson, W. M. Chen, and Erik Janzén. "Photoluminescence Up-Conversion Processes in SiC." Materials Science Forum 433-436 (September 2003): 309–12. http://dx.doi.org/10.4028/www.scientific.net/msf.433-436.309.

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Cheong, Hyeonsik M., Brian Fluegel, Mark C. Hanna, and Angelo Mascarenhas. "Photoluminescence up-conversion inGaAs/AlxGa1−xAsheterostructures." Physical Review B 58, no. 8 (August 15, 1998): R4254—R4257. http://dx.doi.org/10.1103/physrevb.58.r4254.

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Morozov, Yurii V., Sergiu Draguta, Shubin Zhang, Alejandro Cadranel, Yuanxing Wang, Boldizsar Janko, and Masaru Kuno. "Defect-Mediated CdS Nanobelt Photoluminescence Up-Conversion." Journal of Physical Chemistry C 121, no. 30 (July 21, 2017): 16607–16. http://dx.doi.org/10.1021/acs.jpcc.7b05095.

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DONG Guo-ya, 董国亚, 赵. 翔. ZHAO Xiang, 张. 燕. ZHANG Yan, and 孙传强 SUN Chuan-qiang. "Development of portable up-conversion photoluminescence strip detector." Optics and Precision Engineering 25, no. 3 (2017): 584–90. http://dx.doi.org/10.3788/ope.20172503.0584.

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Cassabois, G., C. Kammerer, C. Voisin, C. Delalande, Ph Roussignol, and J. M. Gérard. "Photoluminescence up-conversion of single InAs/GaAs quantum dots." Physica E: Low-dimensional Systems and Nanostructures 13, no. 2-4 (March 2002): 105–8. http://dx.doi.org/10.1016/s1386-9477(01)00497-0.

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Park, Ta-Ryeong, Tae Yang Park, Suk Hwan Youn, and N. M. Khaidukov. "Photoluminescence investigation of energy up-conversion in KY1−xErxF4." Journal of Luminescence 106, no. 3-4 (April 2004): 281–89. http://dx.doi.org/10.1016/j.jlumin.2003.10.007.

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Huang, Yinpeng, Laihui Luo, Jia Wang, Qianghui Zuo, Yongjie Yao, and Weiping Li. "The down-conversion and up-conversion photoluminescence properties of Na0.5Bi0.5TiO3:Yb3+/Pr3+ ceramics." Journal of Applied Physics 118, no. 4 (July 28, 2015): 044101. http://dx.doi.org/10.1063/1.4927278.

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Steeds, John W., S. A. Furkert, W. Sullivan, and Günter Wagner. "Origin of the Up-Conversion Process in 4H SiC." Materials Science Forum 527-529 (October 2006): 473–76. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.473.

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The unusual behaviour of two optical centres with zero phonon lines close to 463nm has been investigated by means of low-temperature photoluminescence microscopy using 488nm and 325nm laser excitation. The experiments were performed on as-irradiated samples and also after annealing isochronally to various temperatures up to 1300°C.
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Mironova-Ulmane, N., A. Sarakovskis, and V. Skvortsova. "Up-conversion and Photoluminescence in Er3+ Single Crystal MgAl-spinel." Physics Procedia 76 (2015): 106–10. http://dx.doi.org/10.1016/j.phpro.2015.10.020.

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Dissertations / Theses on the topic "Up-conversion photoluminescence"

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Regny, Sylvain. "Nanocristaux multifonctionnels pour l'élaboration de sondes biologiques." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI056.

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La médecine s’intéresse de plus en plus à des systèmes nanométriques visant la détection précoce de cellules malignes, le traitement de ces dernières ou la compréhension de mécanismes biologiques. Des nanoparticules fluorescentes et des nanocristaux harmoniques aux propriétés non-linéaires intéressantes ont été étudiés comme agents de contraste pour l’imagerie biomédicale.Dans ce travail, nous avons recherché un matériau non-centrosymétrique dont la matrice permet un dopage d’ions lanthanides afin de développer des sondes multifonctionnelles, c’est-à-dire à la fois luminescentes et harmoniques. Nous nous sommes orientés vers l’iodate de lanthane de phase alpha, α-La(IO3)3, non-centrosymétrique. Dans un premier temps, nous avons développé des synthèses hydrothermales assistées par micro-ondes pour permettre de cristalliser la phase alpha et produire des particules de taille nanométrique (< 100 nm). La présence de nombreux pseudo-polymorphes nécessite le contrôle précis des paramètres de synthèse, en particulier de la température de synthèse, pour obtenir exclusivement des nanoparticules de α-La(IO3)3. L’étude de différents intermédiaires réactionnels (La(IO3)3(OH2), La(IO3)2.66(OH)0.33) nous a permis de mettre en évidence une transformation de phase entre ces composés et la phase α-La(IO3)3. Dans un deuxième temps, nous avons utilisé deux dispositifs optiques permettant de mesurer l’efficacité de génération de second harmonique : l’un permettant l’étude de nanocristaux de α-La(IO3)3 individuels et l’autre utilisant un ensemble de nanocristaux en suspension dans un solvant. Ce dernier, basé sur la diffusion Hyper-Rayleigh, nous a permis de quantifier la réponse non-linéaire de nanocristaux α-La(IO3)3 de diamètre 20-50 nm et de déterminer un coefficient non-linéaire < d > de 8 pm.V-1, comparable aux valeurs obtenues pour d’autres nanocristaux harmoniques tels que BaTiO3 ou LiNbO3. Enfin, nous avons montré la possibilité d’incorporer des ions lanthanides tels que Er3+ et Yb3+ dans ces nanocristaux d’iodate de lanthane, conduisant à des nanocristaux de α-La1-x-yYbyErx(IO3)3. Ces nanocristaux sont toujours actifs en génération de second harmonique et émettent simultanément un signal de photoluminescence. Ainsi, pour une excitation dans le proche infra-rouge (800 nm ou 980 nm par exemple), nous avons observé simultanément un signal de second harmonique et de photoluminescence par up-conversion. Nous avons démontré l’intérêt d’un co-dopage Yb3+/Er3+ pour une optimisation du signal d’up-conversion sous une excitation à 980 nm. Ainsi, par un dopage d’ions lanthanides tels que Er3+ et Yb3+, les nanocristaux de α-La(IO3)3 présentent une émission simultanée de génération de second harmonique et de photoluminescence. La combinaison de ces deux propriétés permet d’envisager d’utiliser ces nanocristaux bifonctionnels pour une imagerie par luminescence, technique classique, tout en la couplant avec une imagerie multiphoton, plus coûteuse mais présentant des avantages non-négligeables (rapidité de scans, meilleure sélectivité spatiale, sensibilité à la polarisation)
Medicine is increasingly interested in nanometric systems for the early detection of malignant cells, their treatment or understanding of biological mechanisms. Fluorescent nanoparticles and harmonic nanocrystals with interesting non-linear properties have been studied as contrast agents for biomedical imaging.In this work, we explored a non-centrosymmetric material whose matrix allows a doping of lanthanide ions in order to develop multifunctional probes, i. e. both luminescent and harmonic. We focused on non-centrosymmetric iodate phase: alpha lanthanum iodate, α-La(IO3)3. First, we developed microwave-assisted hydrothermal syntheses to crystallize the alpha phase and produce nano-sized particles (< 100 nm). The presence of many pseudo-polymorphs requires precise control of the synthesis parameters, in particular the synthesis temperature, to obtain exclusively nanoparticles of α-La(IO3)3. The study of different reaction intermediates (La(IO3)3(OH2), La(IO3)2.66(OH)0.33) allowed us to identify a phase transformation between these compounds and the phase α-La(IO3)3. Secondly, we used two optical devices to evaluate the second harmonic generation efficiency of the synthesized α-La(IO3)3 nanocrystals: one set-up allowed us to study individual α-La(IO3)3 nanocrystals and the other used an ensemble of α-La(IO3)3 nanocrystals in suspension in a solvent. The latter, based on Hyper-Rayleigh scattering, quantified the non-linear response of nanocrystals α-La(IO3)3 with a diameter of 20-50 nm and allowed us to determine a non-linear coefficient < d > of 8 pm.V-1, a value comparable to the ones obtained for other harmonic nanocrystals such as BaTiO3 or LiNbO3. Finally, we showed the possibility of incorporating lanthanide ions such as Er3+ and Yb3+ into these lanthanum iodate nanocrystals, leading to α-La1-x-yYbyErx(IO3)3 nanocrystals. These nanocrystals are still active in second harmonic generation and simultaneously emit a photoluminescence signal. Thus, for excitation in the near infrared (800 nm or 980 nm for instance), we simultaneously observed a signal of second harmonic and a photoluminescence signal based on up-conversion processes. We demonstrated the interest of an Yb3+/Er3+ co-doping for an optimization of the up-conversion signal under excitation at 980 nm. Thus, Er3+ and Yb3+-doped nanocrystals of α-La(IO3)3 exhibit simultaneous emission of second harmonic generation and photoluminescence. The combination of these two properties makes it possible to consider using these bifunctional nanocrystals for conventional luminescence imaging, while coupling it with multiphoton imaging, which is more expensive but has significant advantages (scan speed, better spatial selectivity, polarization sensitivity)
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Yang, Zhenyu. "Synthèse et caractérisation de différentes nanoparticules up-conversion à base de fluorures cubiques dopées Yb/Er dans le NIR au VIS." Electronic Thesis or Diss., Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEC031.

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L'objectif de ce projet de doctorat est de développer la synthèse de nanoparticules de fluoré dopées avec des ions de terres rares ou de métaux de transition pour de nouvelles applications en nanophotonique, telles que des sondes pour l'imagerie thermique à l'échelle nanométrique. Les nanoparticules peuvent également être utilisées pour le revêtement de cellules photovoltaïques afin d'optimiser leur rendement par absorption d'une large gamme de longueurs d'ondes. La particularité des particules fluorées dopées avec les ions adéquats consiste à présenter, par exemple, des processus efficaces de conversion ascendante ou des émissions infrarouges efficaces, en raison de la nature ionique élevée de la liaison métal-fluor. L'accent sera mis sur le développement et l'optimisation des procédés millifluidiques à basse température qui sont en mesure d'assurer la chimie, la morphologie et les homogénéités de taille des nanoparticules telles que celles obtenues. Les nanoparticules synthétisées seront caractérisées (composition chimique, distribution de taille, morphologie) ainsi que leurs propriétés physiques, en particulier les propriétés de la luminescence. La possibilité d'une migration des processus de synthèse millifluidique vers les processus microfluidiques devrait être explorée
The aim of this PhD project is to develop the synthesis of fluoride nanoparticles doped with rare earth or transition metal ions for novel applications in nanophotonics, such as probes for thermal imaging at nanoscale. Nanoparticles can also use for the coating of photovoltaic cells to optimize their yield by absorption of a larger range of wavelengths. The particularity of the fluoride particles doped with the adequate ions, is to exhibit, for example, efficient up-conversion processes or efficient infrared emissions, due to the high ionic nature of the metal-fluorine bonding. Emphasis will be put on the development and optimization of low-temperature millifluidic processes which are able to ensure the chemical, morphology and size homogeneities of the as obtained nanoparticles. The synthesized nanoparticles will be characterized (chemical composition, size distribution, morphology) as well as their physical properties, particularly the luminescence properties. The possibility of a migration of the millifluidic synthesis processes to microfluidic processes should be explored
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Wen, Xiaoming, and n/a. "Ultrafast spectroscopy of semiconductor nanostructures." Swinburne University of Technology, 2007. http://adt.lib.swin.edu.au./public/adt-VSWT20070426.110438.

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Semiconductor nanostructures exhibit many remarkable electronic and optical properties. The key to designing and utilising semiconductor quantum structures is a physical understanding of the detailed excitation, transport and energy relaxation processes. Thus the nonequilibrium dynamics of semiconductor quantum structures have attracted extensive attention in recent years. Ultrafast spectroscopy has proven to be a versatile and powerful tool for investigating transient phenomena related to the relaxation and transport dynamics in semiconductors. In this thesis, we report investigations into the electronic and optical properties of various semiconductor quantum systems using a variety of ultrafast techniques, including up-conversion photoluminescence, pump-probe, photon echoes and four-wave mixing. The semiconductor quantum systems studied include ZnO/ZnMgO multiple quantum wells with oxygen ion implantation, InGaAs/GaAs self-assembled quantum dots with different doping, InGaAs/InP quantum wells with proton implantation, and silicon quantum dots. The spectra of these semiconductor nanostructures range from the ultraviolet region, through the visible, to the infrared. In the UV region we investigate excitons, biexcitons and oxygen implantation effects in ZnO/ZnMgO multi-quantum wells using four-wave mixing, pump-probe and photoluminescence techniques. Using time-resolved up-conversion photoluminescence, we investigate the relaxation dynamics and state filling effect in InGaAs self-assembled quantum dots with different doping, and the implantation effect in InGaAs/InP quantum wells. Finally, we study the optical properties of silicon quantum dots using time-resolved photoluminescence and photon echo spectroscopy on various time scales, ranging from microseconds to femtoseconds.
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Jenouvrier, Pierre. "Relations entre propriétés spectroscopiques et microstructurales de couches minces de titanates de terres rares élaborées par sol-gel et intégration dans des dispositifs actifs." Phd thesis, Grenoble INPG, 2003. http://tel.archives-ouvertes.fr/tel-00004400.

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Le développement de couches minces dopées terres rares a suscité un regain d'intérêt au cours des dernières années. Dans ce rapport, nous présentons l'élaboration de couches minces de titanate de terres rares de type Y2-xLnxTi2O7 (Ln=Er, Tm, Yb, Nd) par procédé Aérosol-gel et leur caractérisation. Le procédé Aérosol-gel est une technique de dépôt originale fondée sur la transformation sol-gel d'un film liquide déposé par pulvérisation ultrasonore. Diverses procédures de traitement thermique ont été mises en œuvre de façon à étudier l'influence de la microstructure de la couche mince sur ses propriétés spectroscopiques. Les couches cristallisent dans une phase cubique de type pyrochlore autour de 750-785°C, suivant la durée du traitement. Les couches Y2-xErxTi2O7 (YETO) amorphes et cristallisées présentent une forte émission à 1530 nm lorsqu'elles sont excitées à 977 nm en configuration guidée. Une relation a été établie entre la microstructure de la couche et ses propriétés spectroscopiques. L'élaboration d'une solution solide YETO permet de diluer de façon homogène les ions erbium tout en protégeant efficacement la terre rare des impuretés. Ce travail montre que la concentration d'auto-extinction des couches cristallisées est plus grande (9. 1020 ions/cm3) que celle des couches amorphes (2. 1020 ions/cm3). L'introduction d'ions ytterbium dans la maille YETO permet d'améliorer d'un facteur 10 l'intensité de l'émission à 1530 nm des ions erbium et exacerbe également leur émission par up-conversion dans le vert. Des couches amorphes Y2-x-yTmxYbyTi2O7 ont également été élaborées et présentent une forte émission par up-conversion dans le bleu sous excitation à 977 nm. Des couches YETO ont également été introduites dans des dispositifs optiques élémentaires. Des guides d'ondes confinés (inversés et chargés) ont été fabriqués et caractérisées. Ils présentent une bonne émission à 1530 nm et un bon confinement optique. Une microcavité verticale a également été élaborée en intégrant une couche YETO demi-onde entre deux miroirs de Bragg formés par une alternance de couches SiO2/TiO2. La cavité présente un mode de résonance unique à 525 nm, et l'émission de l'erbium à cette longueur d'onde est augmentée d'un facteur 30.
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Mathevula, Langutani Eulenda. "Optical and magnetic properties of rare earth Doped α-Fe2O3 for future bio-imaging applications." Thesis, 2018. http://hdl.handle.net/10500/26881.

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Imaging techniques have been developed for decades for the detection of biomolecules in biomedicine cells, in vitro or in living cells and organisms. The application however, often constrained by the available probes, whose optical properties may limit the imaging possibilities. It is very essential to improve the sensitivity of these devices by enhancing efficiency to detection. Recently, Fe3O4 has been used primarily in cancer theranostic application such as magnetic resonance imaging (MRI). However, its toxicity towards normal cells has been pointed out by scientific communities, when they are involved in in vitro (helics) cancer treatment. In this work, we have chosen to use α-Fe2O3, because it has proven to be less toxic than Fe3O4. Hematite is antiferromagnetic (AFM) at room temperature with a small canted moment lying within the crystal symmetry plane. At low temperature, hematite undergoes a magnetic phase transition from weak ferromagnetic (WFM) to a pure antiferromagnetic configuration (AF), which is known as the Morin transition. This magnetic property makes it possible for hematite to be applied in imaging technique. To enhance the optical properties, the α-Fe2O3 is doped with lanthanide ions due to their unique optical properties. Incorporation of these rare earth ions, enable the α-Fe2O3 to have enhance luminescence properties. Imaging techniques have been developed for decades for the detection of biomolecules in biomedicine cells, in vitro or in living cells and organisms. The application however, often constrained by the available probes, whose optical properties may limit the imaging possibilities. It is very essential to improve the sensitivity of these devices by enhancing efficiency to detection. Recently, Fe3O4 has been used primarily in cancer theranostic application such as magnetic resonance imaging (MRI). However, its toxicity towards normal cells has been pointed out by scientific communities, when they are involved in in vitro (helics) cancer treatment. In this work, we have chosen to use α-Fe2O3, because it has proven to be less toxic than Fe3O4. Hematite is antiferromagnetic (AFM) at room temperature with a small canted moment lying within the crystal symmetry plane. At low temperature, hematite undergoes a magnetic phase transition from weak ferromagnetic (WFM) to a pure antiferromagnetic configuration (AF), which is known as the Morin transition. This magnetic property makes it possible for hematite to be applied in imaging technique. To enhance the optical properties, the α-Fe2O3 is doped with lanthanide ions due to their unique optical properties. Incorporation of these rare earth ions, enable the α-Fe2O3 to have enhance luminescence properties. These lanthanide-doped nanoparticles (UCNPs) undergoes up-conversion process which have remarkable ability to combine two or more low energy photons to generate a singly high energy photon by an anti-stokes process and hold great promise for bio-imaging. These nanoparticles exhibit excellent photostability, continuous emission capability and sharp multi-peak line emission. With near infrared excitation, light scattering by biological tissues is substantially reduced. α-Fe2O3 have been singly and co-doped with Holmium, Thulium, and Ytterbium by both sol-gel and microwave methods. The doping of these lanthanides have shown improved luminescent properties of α-Fe2O3. The up-conversion has been observed from co-doping Thulium and Ytterbium. This work is a proof of concept to show the up-conversion in α-Fe2O3. However, the up-conversion intensity is low about 200000 CPS maximum observed, this could be due to the nature of the host structure quenching the luminescence. There is rather, a need to increase the intensity for the maximum application to be achieved.
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Conference papers on the topic "Up-conversion photoluminescence"

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RUSAKOV, K. I., A. A. GLADYSHCHUK, D. TALAPIN, and A. EYCHMÜLLER. "PHOTOLUMINESCENCE UP-CONVERSION IN CdTe NANOCRYSTALS." In Physics, Chemistry and Application of Nanostructures - Reviews and Short Notes to Nanomeeting 2003. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812796738_0027.

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Strelchuk, V. V., Mikhail Y. Valakh, M. V. Vuychik, S. V. Ivanov, Petr S. Kop'ev, and T. V. Shubina. "High-efficient up-conversion of photoluminescence in CdSe/ZnSe nanostructures." In SPIE Proceedings, edited by Zhores I. Alferov and Leo Esaki. SPIE, 2002. http://dx.doi.org/10.1117/12.511505.

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Kuno, Masaru K., and Yurii Morozov. "Defect-mediated photoluminescence up-conversion in cadmium sulfide nanobelts (Conference Presentation)." In Optical and Electronic Cooling of Solids III, edited by Richard I. Epstein, Denis V. Seletskiy, and Mansoor Sheik-Bahae. SPIE, 2018. http://dx.doi.org/10.1117/12.2290468.

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Xiaoyong Wang, Jiayu Zhang, and Min Xiao. "Photoluminescence up-conversion involving surface states in colloidal CdTe quantum dots." In Quantum Electronics and Laser Science (QELS). Postconference Digest. IEEE, 2003. http://dx.doi.org/10.1109/qels.2003.238521.

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Morozov, Yurii, and Masaru K. Kuno. "Defect-mediated photoluminescence up-conversion in cadmium sulfide nanobelts (Conference Presentation)." In Optical and Electronic Cooling of Solids II, edited by Richard I. Epstein, Denis V. Seletskiy, and Mansoor Sheik-Bahae. SPIE, 2017. http://dx.doi.org/10.1117/12.2249930.

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Buyanova, I. A., J. P. Bergman, W. M. Chen, M. Izadifard, Y. Hong, and C. W. Tu. "Role of Nitrogen In Photoluminescence Up-conversion In GaInNP/GaAs Heterostructures." In PHYSICS OF SEMICONDUCTORS: 28th International Conference on the Physics of Semiconductors - ICPS 2006. AIP, 2007. http://dx.doi.org/10.1063/1.2729925.

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Hallermann, Florian, Jan Christoph Goldschmidt, Stefan Fischer, Philipp Löper, and Gero von Plessen. "Calculation of up-conversion photoluminescence in Er3+ions near noble-metal nanoparticles." In SPIE Photonics Europe, edited by Ralf B. Wehrspohn and Andreas Gombert. SPIE, 2010. http://dx.doi.org/10.1117/12.854426.

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Kinugawa, Noriyuki, Shigeo Asahi, and Takashi Kita. "Reciprocal relationship between photoluminescence and photocurrent in two-step photon up-conversion solar cell." In 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC). IEEE, 2019. http://dx.doi.org/10.1109/pvsc40753.2019.8980460.

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Oya, Kosuke, Saya Okano, Toshihisa Ueda, and Takeshi Yokomori. "Temperature dependence on up-conversion photoluminescence properties of Yb3+/Er3+ co-doped Y2O3 phosphors." In Frontiers in Optics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/fio.2012.fw3a.28.

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Golovan, Leonid A., Alexander V. Elopov, Vladimir B. Zaitsev, Alexander A. Ezhov, Stanislav V. Zabotnov, Denis M. Zhigunov, Oleg N. Karpov, Georgiy A. Shandryuk, Alexey S. Merekalov, and Raisa V. Talroze. "Photoluminescence and Up-Conversion in CdSe and CdSe/ZnS Quantum Dots in Amorphous and Liquid-Crystal Polymer Matrices." In Frontiers in Optics. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/fio.2020.jtu1a.24.

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