Sm3+ doped Ca3Y(AlO)3(BO3)4: A near-UV pumped orange-red phosphor with high thermal stability

荧光粉 发光 色度 热稳定性 兴奋剂 材料科学 单斜晶系 分析化学(期刊) 发射光谱 光电子学 结构精修 光学 晶体结构 谱线 化学 结晶学 物理 天文 有机化学 色谱法
作者
Ningning Feng,Guoqing Zhang,Shenwei Bai,Dingze Lu,De-Zhong Cao,Gang Wu,Xinzhou Han,Feng Wang
出处
期刊:Optik [Elsevier BV]
卷期号:275: 170554-170554
标识
DOI:10.1016/j.ijleo.2023.170554
摘要

Rare-earth-ion-activated borate phosphor is an intensive topic in the lighting field due to the thermally high stability and excellent luminescence efficiency. Herein, a sequence of borate phosphors: Ca3Y(AlO)3(BO3)4:x mol% Sm3+ were successfully prepared using a conventional solid-state method. We demonstrate that the sample is a monoclinic crystal system with the P63/m space group by analyzing the crystal structure and Rietveld refinement. In addition, the ultraviolet-visible-near-infrared (UV–VIS–NIR) spectra and the first-principles calculations reveal that the Ca3Y(AlO)3(BO3)4 host can provide an excellent band-gap environment (Eg=4.34 eV) for the luminescent center. Thereafter, the analysis of fluorescence spectra shows that the excitation spectrum consists of a series of peaks, among which the 405 nm peak formed by the 6H5/2→4F7/2 transition of Sm3+ plays a dominant role. From the perspective of the emission spectrum, the 4G5/2→6H7/2 (615 nm) transition is most significant among the four narrow emission bands appeared in the visible region. The concentration quenching occurs when the optimal doping concentration (6 mol%) of Sm3+ is exceeded, and the quenching mechanism is the dipole-dipole interaction. The temperature-dependent luminescence of the Ca3Y(AlO)3(BO3)4:6 mol% Sm3+ sample reveals that 97 % of the initial intensity is still maintained at 483 K, suggesting outstanding thermal stability. Beyond that, the orange-red chromaticity coordinate (0.602, 0.396), high color purity (80 %), and ideal correlated color temperature (1700 K) indicate that Ca3Y(AlO)3(BO3)4: Sm3+ phosphor is an excellent candidate as a red phosphor for converting tri-phosphors to white light-emitting-diodes (LEDs) lighting.
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