文献类型：期刊文献

英文题名：Luminescence performance and thermoluminescence of a new long afterglow phosphor Na2Ca2-xCexSc2Si3O12for AC-LED applications

作者：Zheng, Weicheng[1]; Yu, Junwen[1]; Zhu, Fangyin[1]; Wang, Chunyu[1]; Chen, Meiling[1]; Luo, Fangyan[1]; Xiong, Zhengye[1]; Guo, Jingyuan[1]

机构：[1] School of Electronic and Information Engineering, Guangdong Ocean University, Zhangjiang, 524088, China

年份：2025

外文期刊名：Ceramics International

收录：EI(收录号：20254919656985)、Scopus(收录号：2-s2.0-105023852677)

语种：英文

外文关键词：Activation energy - Calcium compounds - Cerium compounds - Cesium compounds - Curve fitting - Data mining - High temperature applications - Light emitting diodes - Luminance - Silicon compounds - Sodium compounds

外文摘要：With the wide adoption of blue-light chips, the demand for blue-light-excited long afterglow phosphors is increasing, and the current long afterglow phosphors excited by blue light exhibit relatively low afterglow brightness. In this study, a novel long afterglow phosphor, Na2Ca2-xCexSc2Si3O12(0.0025 ≤ x?≤?0.08) phosphor, was prepared by a high-temperature solid-state method, and it was found that the increase in Ce3+concentration led to the enhancement of crystal field splitting as well as the substitution of Ca2+by Ce3+, which in turn led to the spectral redshift. In addition, as the temperature rises, the emission intensity value of this phosphor at 450?K decreases to 69.39?% of that at 300?K with an activation energy ΔEq?=?0.3445?eV/K. Therefore, this phosphor material has a better thermal stability, which makes it more suitable for AC-LED lighting applications. Finally, analysis of the thermoluminescence curves by first-order kinetic fitting and the initial rise method yielded a trap depth of Na2Ca2-0.02Ce0.02Sc2Si3O12is about 0.73?eV for the temperature of 300?K–380?K. The afterglow mechanism makes the flickering rate of Na2Ca2-0.02Ce0.02Sc2Si3O12AC-LED reduced by 67.67?%, indicating that the phosphor material has strong potential for AC-LED applications. ? 2025 Elsevier Ltd and Techna Group S.r.l. All rights are reserved, including those for text and data mining, AI training, and similar technologies.