Effect of particle size and morphology on the properties of luminescence in ZnWO4

Лисицын, В. М.; Valiev, Damir; Tupitsyna, I.A.; Полисадова, Е. Ф.; Олешко, В. И.; Лисицына, Л. А.; Andryuschenko, L.A.; Yakubovskaya, A.; Vovk, O.M.

doi:10.1016/j.jlumin.2014.03.024

Cited by 28 publications

(13 citation statements)

References 15 publications

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“…The existence of such nanosized defect complexes was shown for LiF:W, U, Ti scintillation crystals in References [52,53], and for zinc and cadmium tungstates in References [54][55][56]. Complex impurity centers in binary ionic and complex ionic-covalent crystals could be created, as shown in Reference [57].…”

Section: Discussionmentioning

confidence: 93%

Nanodefects in YAG:Ce-Based Phosphor Microcrystals

et al. 2019

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The present paper focused on the study of spectral–kinetic characteristics of luminescence in two batches of yttrium aluminum garnet (YAG):Ce-based phosphors synthesized in different years by two manufacturers: NPO “Platan” in Russia and “GrandLux” in the People’s Republic of China (PRC). Upon studying the structural characteristics of the phosphors—elemental composition, morphology, and X-ray diffraction (XRD) patterns—it was concluded that both types of YAG:Ce phosphors are highly imperfect. The presence of heterogeneities of different nature was accompanied by the introduction—to compensate for charges and elastic stresses—of intrinsic lattice defects during synthesis. There is a high probability of creating complex defects during phosphor synthesis. Luminescence properties (full width at half maximum (FWHM), spectral position of the emission peaks, excitation spectra of emission, emission decay time) are affected by the nearest environment of the luminescence center; whereas the degree of correlation of defects (distance between the components of the donor–acceptor pair) does not depend on the concentration of impurities, intrinsic defects, and their ratio. The results do not fit into the framework of existing ideas regarding the processes in phosphors as systems with widely distributed luminescence centers. The patterns obtained in the paper are discussed based on a hypothesis according to which a nanodefect phosphorus crystal phase is formed during the synthesis.

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Section: Discussionmentioning

confidence: 93%

Nanodefects in YAG:Ce-Based Phosphor Microcrystals

et al. 2019

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“…As discussed about the spectroscopic properties of nanophosphors, scaling down sizes to the nanometer level impacts on the luminescent properties of insulating inorganic phosphors. While the surface effects can broaden the emission/absorption lines and cause non-exponential decay patterns of the luminescence intensity [149], changes in the electronic dispersion can correspond to increasing luminescence decay with the reduction of the average grain size [69,118,150,151]. For doped phosphors, decreased size or grain size result in reduced local crystal symmetry with the optically active surface ions that occupy the sites of lower symmetry.…”

Section: Nanoscale-related Unconventional Production Of White Lightmentioning

confidence: 99%

Nanophosphors-Based White Light Sources

Cesaria

Bartolo

2019

Nanomaterials

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Miniaturization requests and progress in nanofabrication are prompting worldwide interest in nanophosphors as white-emission mercury-free lighting sources. By comparison with their bulk counterparts, nanophosphors exhibit reduced concentration quenching effects and a great potential to enhance luminescence efficiency and tunability. In this paper, the physics of the nanophoshors is overviewed with a focus on the impact of spatial confinement and surface-to-volume ratio on the luminescence issue, as well as rare earth-activated multicolor emission for white light (WL) output. In this respect, the prominently practiced strategies to achieve WL emission are single nanophosphors directly yielding WL by means of co-doping and superposition of the individual red, green, and blue emissions from different nanophosphors. Recently, a new class of efficient broadband WL emitting nanophosphors has been proposed, i.e., nominally un-doped rare earth free oxide (yttrium oxide, Y2O3) nanopowders and Cr transition metal-doped garnet nanocrystals. In regard to this unconventional WL emission, the main points are: it is strictly a nanoscale phenomenon, the presence of an emitting center may favor WL emission without being necessary for observing it, and, its inherent origin is still unknown. A comparison between such an unconventional WL emission and the existing literature is presented to point out its novelty and superior lighting performances.

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“…A partir disso, tornase possível a estabilização da fase monoclínica em baixas temperaturas. O uso de dopantes nesta classe de materiais tem atraído bastante interesse no meio científico não só pelo seu uso como uma sonda de investigação do processo de migração de energia, mas também na procura de novos materiais para aplicações tecnológicas 8,9,10,11,12 .…”

Section: Introductionunclassified

Estudo das Propriedades Fotocatalíticas do BiPO4 Dopado com Zinco para Eliminação de Resíduos de Corante Proveniente de Indústrias Têxteis

et al. 2020

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Cristais de BiPO4 puros e dopados com 0,5 e 1,0% em mol de zinco foram sintetizados a partir do método de coprecipitação em temperatura ambiente. Análises por Difração de Raios X evidenciam um sistema monofásico, nanométrico e com estrutura monoclínica. A morfologia observada foi de bastões. Os catalisadores BiPO4: Zn2+ apresentaram satisfatória atividade fotocatalítica para a decomposição de soluções de corante azul de metileno sob irradiação de luz ultravioleta, em que a melhor performance na fotodegradação foi obtida com o material puro, que apresentou maior área superfiial que as demais amostras dopadas com zinco.

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Effect of particle size and morphology on the properties of luminescence in ZnWO4

Cited by 28 publications

References 15 publications

Nanodefects in YAG:Ce-Based Phosphor Microcrystals

Nanodefects in YAG:Ce-Based Phosphor Microcrystals

Nanophosphors-Based White Light Sources

Estudo das Propriedades Fotocatalíticas do BiPO4 Dopado com Zinco para Eliminação de Resíduos de Corante Proveniente de Indústrias Têxteis

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