https://scholars.lib.ntu.edu.tw/handle/123456789/606930
標題: | Linking Macro- And Micro-structural Analysis with Luminescence Control in Oxynitride Phosphors for Light-Emitting Diodes | 作者: | Fang M.-H Lin J.-C Huang W.-T Majewska N Barzowska J Mahlik S Pang W.K Lee J.-F Sheu H.-S Liu R.-S. RU-SHI LIU |
關鍵字: | Light;Luminescence;Nitrides;Phosphors;Structural analysis;Structural properties;X ray absorption;X ray diffraction;High purity;Innovative materials;Light-emitting device;Lightemitting diode;Luminescence controls;Micro-structural;Nitride phosphor;Oxide phosphors;Oxynitride phosphor;Synthesised;Light emitting diodes | 公開日期: | 2021 | 卷: | 33 | 期: | 19 | 起(迄)頁: | 7897-7904 | 來源出版物: | Chemistry of Materials | 摘要: | Eu2+-doped UCr4C4-type oxynitride phosphors are emerging innovative materials to replace oxide and nitride phosphors for high-end light-emitting devices. However, the synthesis of high-purity phosphors and controlling the O/N ratio remain challenging. Here, we synthesized a series of Sr0.98Li2.5 + zAl1.5 - zO3 + 2zN1 - 2z:0.02Eu phosphors by precursor engineering, and these products showed an unexpected redshift from 583 to 620 nm. Joint refinement combining synchrotron X-ray diffraction and neutron powder diffraction was conducted to determine macro-structural properties. Extended X-ray absorption fine structure spectra revealed the micro-structural properties around the luminescent centers. The effects on photoluminescence from the first-shelled O/N ligands and the second-shelled Li/Al ions were demonstrated in detail. Finally, the light-emitting diode packages constructed using our phosphor revealed higher luminous efficiency of radiation and luminous efficacy than the SrLiAl3N4:Eu comparator. This study provided the basis for developing novel oxynitride phosphors and insights into the structural analysis from the macro and micro perspectives. ? 2021 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85117122794&doi=10.1021%2facs.chemmater.1c02990&partnerID=40&md5=0b1e9710fddbcd39a12da0538deb444a https://scholars.lib.ntu.edu.tw/handle/123456789/606930 |
ISSN: | 08974756 | DOI: | 10.1021/acs.chemmater.1c02990 |
顯示於: | 化學系 |
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