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微粉CaYMgScSiO:Ce硅酸石榴石作为白光发光二极管的高效光转换器

Micropowder CaYMgScSiO:Ce Silicate Garnet as an Efficient Light Converter for White LEDs.

作者信息

Shakhno Anna, Markovskyi Anton, Zorenko Tetiana, Witkiewicz-Łukaszek Sandra, Vlasyuk Yevheniya, Osvet Andres, Elia Jack, Brabec Christoph J, Batentschuk Miroslaw, Zorenko Yuriy

机构信息

Institute of Physics, Kazimierz Wielki University in Bydgoszcz, 85090 Bydgoszcz, Poland.

Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering VI, University of Erlangen-Nürnberg, 91058 Erlangen, Germany.

出版信息

Materials (Basel). 2022 Jun 1;15(11):3942. doi: 10.3390/ma15113942.

DOI:10.3390/ma15113942
PMID:35683240
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9182154/
Abstract

This work is dedicated to the crystallization and luminescent properties of a prospective CaYMgScSiO:Ce (CYMSSG:Ce) micropowder (MP) phosphor converter (pc) for a white light-emitting LED (WLED). The set of MP samples was obtained by conventional solid-phase synthesis using different amounts of BO flux in the 1-5 mole percentage range. The luminescent properties of the CYMSSG:Ce MPs were investigated at different Ce concentrations in the 1-5 atomic percentage range. The formation of several Ce multicenters in the CYMSSG:Ce MPs was detected in the emission and excitation spectra as well as the decay kinetics of the Ce luminescence. The creation of the Ce multicenters in CYMSSG:Ce garnet results from: (i) the substitution by the Ce ions of the heterovalent Ca and Y cations in the dodecahedral position of the garnet host; (ii) the inhomogeneous local environment of the Ce ions when the octahedral positions of the garnet are replaced by heterovalent Mg and Sc cations and the tetrahedral positions are replaced by Si cations. The presence of Ce multicenters significantly enhances the Ce emission band in the red range in comparison with conventional YAG:Ce phosphor. Prototypes of the WLEDs were also created in this work by using CYMSSG:Ce MP films as phosphor converters. Furthermore, the dependence of the photoconversion properties on the layer thickness of the CYMSSG:Ce MP was studied as well. The changes in the MP layer thickness enable the tuning of the white light thons from cold white/daylight to neutral white. The obtained results are encouraging and can be useful for the development of a novel generation of pcs for WLEDs.

摘要

这项工作致力于研究一种用于白光发光二极管（WLED）的潜在CaYMgScSiO:Ce（CYMSSG:Ce）微粉（MP）磷光体转换器（pc）的结晶和发光特性。通过常规固相合成，使用1 - 5摩尔百分比范围内不同量的BO助熔剂获得了一组MP样品。研究了CYMSSG:Ce MPs在1 - 5原子百分比范围内不同Ce浓度下的发光特性。在CYMSSG:Ce MPs的发射光谱、激发光谱以及Ce发光的衰减动力学中检测到了几种Ce多中心的形成。CYMSSG:Ce石榴石中Ce多中心的形成源于：（i）Ce离子取代石榴石主体十二面体位置上的异价Ca和Y阳离子；（ii）当石榴石的八面体位置被异价Mg和Sc阳离子取代且四面体位置被Si阳离子取代时，Ce离子的局部环境不均匀。与传统的YAG:Ce磷光体相比，Ce多中心的存在显著增强了红色范围内的Ce发射带。在这项工作中，还通过使用CYMSSG:Ce MP薄膜作为磷光体转换器制作了WLED的原型。此外，还研究了光转换特性对CYMSSG:Ce MP层厚度的依赖性。MP层厚度的变化能够将白光色调从冷白/日光调至中性白。所得结果令人鼓舞，可用于开发新一代用于WLED的磷光体转换器。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6a2c/9182154/e37ce8d9b735/materials-15-03942-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6a2c/9182154/6dbbff21450b/materials-15-03942-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6a2c/9182154/e6f5bc9ba38a/materials-15-03942-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6a2c/9182154/3164277f3de0/materials-15-03942-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6a2c/9182154/e37ce8d9b735/materials-15-03942-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6a2c/9182154/17d0efdc1ab9/materials-15-03942-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6a2c/9182154/57ac0526cd1c/materials-15-03942-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6a2c/9182154/e6f5bc9ba38a/materials-15-03942-g008.jpg
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