Li Gui-Hua, Yang Nian, Zhang Jing, Si Jia-Yong, Wang Zheng-Liang, Cai Ge-Mei, Wang Xiao-Jun
School of Materials Science and Engineering, Education Ministry Key Laboratory of Non-ferrous Materials Science and Engineering, Central South University, Changsha 410083, People's Republic of China.
School of Materials Science and Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, People's Republic of China.
Inorg Chem. 2020 Mar 16;59(6):3894-3904. doi: 10.1021/acs.inorgchem.9b03565. Epub 2020 Mar 2.
Commercial white LED devices usually suffer from a high color temperature and poor color rendering. Developing a new, efficient, and stable red phosphor is the key to solving this problem. In this work, a series of pure CaYBO:Eu (0 < ≤ 2) samples, including the new and fully transitional borate phosphor CaEuBO (CEBO), have been successfully prepared by solid-state reaction synthesis. CEBO is isostructural with CaYBO (CYBO), belonging to the orthorhombic system with space group (No. 62). Under optimal 393 nm excitation, this borate exhibits a strong red emission, peaking at 615 nm, with high color purity. Interestingly, the luminescence of CEBO is relatively higher than that of CYBO:Eu phosphors. The quantum yield of this non-concentration-quenching phosphor reaches 95.6%. Furthermore, a warm pc-WLED device has been fabricated by mixing as-prepared CEBO powders and commercial BaMgAlO:Eu and (Sr, Ba)SiO:Eu phosphors, which exhibits a high color rendering index (Ra = 83.7) along with a color temperature of around 3883 K. The present work indicates that this new borate, with outstanding quantum efficiency and favorable thermal stability, can be used as a red phosphor for application in WLEDs.
商用白色发光二极管（LED）器件通常存在色温高和显色性差的问题。开发一种新型、高效且稳定的红色荧光粉是解决这一问题的关键。在本工作中，通过固态反应合成成功制备了一系列纯CaYBO:Eu（0＜≤2）样品，包括新型且完全过渡的硼酸盐荧光粉CaEuBO（CEBO）。CEBO与CaYBO（CYBO）同构，属于正交晶系，空间群为（编号62）。在最佳393nm激发下，这种硼酸盐呈现出强烈的红色发射，峰值位于615nm，具有高色纯度。有趣的是，CEBO的发光相对高于CYBO:Eu荧光粉。这种非浓度猝灭荧光粉的量子产率达到95.6%。此外，通过将制备好的CEBO粉末与商用BaMgAlO:Eu和(Sr, Ba)SiO:Eu荧光粉混合制备了一种暖白色发光二极管（pc-WLED）器件，其显色指数高（Ra = 83.7），色温约为3883K。本工作表明，这种新型硼酸盐具有出色的量子效率和良好的热稳定性，可作为红色荧光粉应用于白色发光二极管（WLED）中。
