文献类型：期刊文献

英文题名：Preparation, luminescent properties, and application study of novel SrLa1-xSmxZnTaO6 red phosphor

作者：Hong, Xiaoyu[1]; Zheng, Weicheng[1]; Lai, Nanjia[1]; Su, Xiaohui[1]; Liu, Sichen[1]; Xiong, Zhengye[1]; Guo, Jingyuan[1]

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

年份：2026

外文期刊名：Ceramics International

收录：EI(收录号：20263221247189)、Scopus(收录号：2-s2.0-105046359130)

语种：英文

外文关键词：Activation energy - Crystal impurities - Crystal structure - Doping (additives) - High temperature applications - Light emitting diodes - Optical properties - Perovskite - Photoluminescence - Quenching - Samarium compounds - Solid state reactions - Temperature measurement - Temperature sensors - Thermodynamic stability - Thermometers

外文摘要：SrLa1-xSmxZnTaO6 (x?=?0.01-0.08) double perovskite phosphors were fabricated by high-temperature solid-state reaction. The crystal structure, luminescence characteristics, concentration quenching behavior, thermal stability, optical temperature sensing properties and WLED application prospects were comprehensively analyzed. XRD combined with Rietveld refinement verifies that all as-prepared samples are single-phase without impurity phases induced by Sm3+ doping. The phosphor crystallizes in the cubic system with an Fm-3m (No. 225) space group, exhibiting a crystal structure analogous to BaLaZnTaO6.The photoluminescence spectra revealed that the samples exhibited typical 4f-4f transition emissions of Sm3+ under 407?nm near-ultraviolet excitation, with a dominant emission peak at 648?nm (4G5/2?→?6H9/2) corresponding to red light. With increasing Sm3+ concentration, the luminescence intensity first increased and then decreased, reaching the maximum at x?=?0.06, and the concentration quenching mechanism was verified to be dipole-quadrupole (d-q) interaction. The as-obtained phosphor possessed color coordinates of (0.5906, 0.4087), color purity of 90.50%, CCT of 1718.85?K, and internal quantum efficiency of 49.29%, which were superior to most Sm3+-doped phosphors. Thermal stability measurements showed that the luminescence intensity retention was 77.93% at 423?K and still remained at 71.81% at 473?K, with a thermal quenching activation energy ΔE of 0.186?eV, and the color coordinates showed negligible drift at elevated temperatures. Optical thermometry based on FIR yielded an absolute sensitivity of 0.211?K-1 and a relative sensitivity of 3.968%K?1, demonstrating excellent thermometric properties. Assembled NUV-WLED combined with commercial blue/green phosphors showed CIE (0.333, 0.336), color rendering index Ra of 93.4, and CCT of 5464.39?K, with stable performance over a wide current range of 100–500?mA. The results demonstrate that SrLa0.94Sm0.06ZnTaO6 is an orange-red phosphor with high color purity, superior thermal stability, and excellent thermometric capability, possessing significant application prospects in near-ultraviolet excited WLEDs and non-contact optical thermometry. ? 2026 Published by Elsevier Ltd.