Dye-embedded YAGCe3+@SiO2 composite phosphors toward warm wLEDs through radiative energy transfer preparation, characterization and luminescence properties

doi:10.1039/c8nr07360k

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	Dye-embedded YAGCe3+@SiO2 composite phosphors toward warm wLEDs through radiative energy transfer preparation, characterization and luminescence properties
	Pan, G. H.; Wu, H. J.; He, S.; Zhang, L. L.; Hao, Z. D.; Zhang, X.; Zhang, J. H.
	2018
发表期刊	Nanoscale
ISSN	2040-3364
卷号	10 期号:47 页码:22237-22251
摘要	The most common yellow phosphor for wLEDs, Y3Al5O12:Ce3+ (YAG:Ce3+), suffers from a deficiency of red in its spectral content of light. In this paper, a new strategy is provided to tailor the Ce3+ spectral profile through surface-located dye molecules of ATTO-Rho101, which feature intense, broad absorption in the green-yellow spectral region of Ce3+ emission as well as bright red emission. Sphere-shaped and highly dispersed micrometer and nanometer-sized YAG:Ce3+ (micro/nano-YAG:Ce3+) was synthesized through a modified solvothermal method. Surface SiO2 coating and simultaneous dye embedding were performed on the solvothermally derived YAG:Ce3+, heat-treated micro-YAG:Ce3+ and commercial phosphors. Efficient radiative transfer/reabsorption from Ce3+ in the inner core of YAG to the dye molecules in the SiO2 outer shell, irrespective of the size of the phosphors, was demonstrated in the accumulated YAG:Ce3+@SiO2 + dye powder upon blue light excitation; this enhanced its red emission. Fluorescence microscopy was demonstrated to be a powerful tool to identify the reabsorption phenomenon of the powdered materials. Packaging the heat-treated micro-YAG:Ce3+@SiO2 + dye phosphors on blue LED chips yielded a warm wLED (R-a approximate to 93), but an R-a of only approximate to 79 was obtained for the wLED with commercial YAG:Ce3+@(SiO2 + dye)(5) due to the low concentration of phosphors dispersed in the epoxy resin and the resulting decreased reabsorption by dye molecules. Surface-protonated amine species were found to induce Ce3+ Ce4+ oxidation upon activation by heating or photoirradiation and then quench the photoluminescence (PL) of micro-YAG:Ce3+ even after surface modification by SiO2, YAG or being embedded in an epoxy resin matrix. High calcination temperatures greatly improved the PL stability of micro-YAG:Ce3+ through the removal of surface-capped species. The dye in the silica matrix showed high stability against heating and irradiation due to the so-called caging effects; however, decreased photo-stability was found in commercial YAG:Ce3+@(SiO2 + dye)(5) due to the incomplete and/or loose SiO2 layer grown during multiple surface modifications.
关键词	yttrium-aluminum-garnet fluorescent silica nanoparticles solvothermal synthesis up-conversion yag powders emission ce3+ particles Chemistry Science & Technology - Other Topics Materials Science Physics
DOI	10.1039/c8nr07360k
收录类别	SCI ; EI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/60960
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Pan, G. H.,Wu, H. J.,He, S.,et al. Dye-embedded YAGCe3+@SiO2 composite phosphors toward warm wLEDs through radiative energy transfer preparation, characterization and luminescence properties[J]. Nanoscale,2018,10(47):22237-22251.
APA	Pan, G. H..,Wu, H. J..,He, S..,Zhang, L. L..,Hao, Z. D..,...&Zhang, J. H..(2018).Dye-embedded YAGCe3+@SiO2 composite phosphors toward warm wLEDs through radiative energy transfer preparation, characterization and luminescence properties.Nanoscale,10(47),22237-22251.
MLA	Pan, G. H.,et al."Dye-embedded YAGCe3+@SiO2 composite phosphors toward warm wLEDs through radiative energy transfer preparation, characterization and luminescence properties".Nanoscale 10.47(2018):22237-22251.

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