荧光粉
热稳定性
离子
材料科学
发光二极管
光电子学
显色指数
发光
激活剂(遗传学)
兴奋剂
分析化学(期刊)
化学
色谱法
有机化学
生物化学
基因
作者
G. Li,Xihua Lu,Qinan Mao,Gang Du,M. Liu,Liang Chu,Jiasong Zhong
标识
DOI:10.1016/j.mtchem.2021.100744
摘要
Mn4+-activated double perovskite phosphors with composition diversity have presented excellent luminescent performances. However, the charge imbalance between Mn4+ and matrix cations would increase non-radiative recombination and reduce the structural stability. Here, novel high-efficiency stable Li+/Mn4+ co-incorporated Sr2YSbO6 red phosphors are successfully synthesized via a solid-state reaction method for warm w-LEDs, where the Li+ ions have the effect of charge balance for Sr2YSbO6:Mn4+ and reduce the non-radiative energy transfer among Mn4+ ions. It is demonstrated that the substitution of Li+–Mn4+ pairs for Sb5+ can enhance the bonding with low-shifted diffraction peaks and high emission intensity, and prolong the decay lifetime, compared with those of Mn4+ single-doped ones. Impressively, the thermal stability is enhanced to 89.72% from 84.61% at the original value of 303 K. Finally, a w-LED device based on the optimal phosphor Sr2YSbO6:0.01Mn4+/0.01Li+ red component exhibits a correlated color temperature of 4487 K and color rendering index of 80.2. Therefore, the incorporated Li+ ions serve as both charge compensator and co-activator in Mn4+-activated double perovskite phosphors with the aim of high luminescent performance and thermal stability.
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