文献类型：期刊文献

英文题名：Synthesis, photoluminescence and application of a new red-emitting Ca2AlNbO6:xSm3+ phosphor with excellent thermal stability and optical temperature sensor characteristics

作者：Li, Xiaohui[1]; Zheng, Weicheng[1]; Chen, Meiling[1]; Zhu, Fangyin[1]; Hong, Xiaoyu[1]; Chen, Li[1]; Luo, Bixia[1]; Xiong, Zhengye[1]; Guo, Jingyuan[1]

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

年份：2026

外文期刊名：Ceramics International

收录：EI(收录号：20263621427518)、Scopus(收录号：2-s2.0-105049079479)

语种：英文

外文关键词：Aluminum compounds - Boron compounds - Calcium compounds - High temperature applications - Light emitting diodes - Niobium compounds - Phosphors - Photoluminescence - Samarium compounds - Semiconductor doping - Temperature sensors - Thermodynamic stability

外文摘要：To remedy the technical shortcomings of commercial white light-emitting diodes (WLEDs), including the deficiency of the red light component, poor color rendering performance, and the poor thermal stability of red phosphors, a novel Ca2-xSmxAlNbO6 phosphor was synthesized via the high-temperature solid-state method in this study. Its phase composition, morphology, photoluminescence, and other properties were systematically characterized. The thermal stability and application potential of the optimal sample Ca2AlNbO6:0.04Sm3+ were emphatically investigated. The band gap of the Ca2AlNbO6 host matrix was calculated to be 3.7038?eV using DS-PAW software. The stable lattice environment endows the material with excellent thermal stability. Under 407?nm excitation, the sample exhibits intense red emission at 647?nm, with an optimal Sm3+ doping concentration of 4?mol%. It exhibits a color purity of up to 96.32% and excellent color stability. Thermal stability tests show that, even at temperatures up to 423?K, the phosphor maintains a high activation energy of 0.117?eV. It retains 94.09% of its room-temperature luminescence intensity at 323?K and more than 82.64% at 423?K, with thermal stability compared with peer red phosphors. The optimal sample exhibits an internal quantum efficiency (IQE) of 27.03%. The optimal sample was composited and encapsulated to fabricate a WLED. The device exhibits a color rendering index of 93.12, a correlated color temperature of 5559.25?K, and superior photoelectric performance. Meanwhile, the material exhibits favorable optical temperature-sensing characteristics, with absolute sensitivity (Sa) and relative sensitivity (Sr) reaching 1.68% K?1 and 0.0772?K-1. In summary, the Ca2-xSmxAlNbO6 phosphor achieves high thermal stability of red luminescence, which is attributed to its double perovskite host matrix. It has excellent application potential in high-quality luminescent devices, temperature sensing, and WLEDs. This study provides experimental and theoretical references for the research and development of red phosphors with high thermal stability. ? 2026 Elsevier Ltd and Techna Group S.r.l. All rights are reserved, including those for text and data mining, AI training, and similar technologies.