化学
荧光粉
八面体
发光
锰
量子效率
量子产额
钙钛矿(结构)
兴奋剂
离子
无机化学
结晶学
物理
晶体结构
光电子学
量子力学
荧光
有机化学
作者
Yufei Wang,Fan Ding,Jiayu Wu,Jingbo Ke,Xiaoze Yuan,Xiaofang Wang,Zhongxian Qiu,Wenli Zhou,Jilin Zhang,Shixun Lian
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2022-02-18
卷期号:61 (8): 3631-3640
被引量:29
标识
DOI:10.1021/acs.inorgchem.1c03756
摘要
The tetravalent-state stability of manganese is of primary importance for Mn4+ luminescence. Double perovskite-structured A2B'B″O6:Mn4+ has been recently prevalent, and the manganese ions are assumed to substitute for the B″(IV-VI)O6 site to stabilize at the tetravalent charge state to generate far-red emissions. However, some Mn-doped A2B'B″O6-type materials show no or weak luminescence such as typical Ca2MgWO6:Mn. In this work, a cation-pair co-substitution strategy is proposed to replace 2Ca2+ by Na+-La3+ to form Ca2-2xNaxLaxMgWO6:Mn. The significant structural distortion appears in the solid solution lattices with the contraction of [MgO6] but enlargement of [WO6] octahedron. We hypothesize that the site occupancy preference of Mn migrates from Mg2+ to W6+ sites. As a result, the effective Mn4+/Mn2+ concentration enhances remarkably to regulate nonluminescence to highly efficient Mn4+-related far-red emission. The optimal CaNa0.5La0.5MgWO6:0.9%Mn4+ shows an internal quantum efficiency of 94% and external quantum efficiency of 82%, reaching up to the top values in Mn4+-doped oxide phosphors. This work may provide a new perspective for the rational design of Mn4+-activated red phosphors, primarily considering the site occupancy modification and tetravalent-state stability of Mn.
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