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Site Preference-Driven Mn4+ Stabilization in Double Perovskite Phosphor Regulating Quantum Efficiency from Zero to Champion.
Wang, Yufei; Ding, Fan; Wu, Jiayu; Ke, Jingbo; Yuan, Xiaoze; Wang, Xiaofang; Qiu, Zhongxian; Zhou, Wenli; Zhang, Jilin; Lian, Shixun.
Affiliation
  • Wang Y; Key Laboratory of Light Energy Conversion Materials of Hunan Province College, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, China.
  • Ding F; Key Laboratory of Light Energy Conversion Materials of Hunan Province College, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, China.
  • Wu J; Key Laboratory of Light Energy Conversion Materials of Hunan Province College, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, China.
  • Ke J; Key Laboratory of Light Energy Conversion Materials of Hunan Province College, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, China.
  • Yuan X; State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China.
  • Wang X; National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Huairou District, Beijing 101400, P. R. China.
  • Qiu Z; University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
  • Zhou W; Key Laboratory of Light Energy Conversion Materials of Hunan Province College, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, China.
  • Zhang J; Key Laboratory of Light Energy Conversion Materials of Hunan Province College, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, China.
  • Lian S; State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China.
Inorg Chem ; 61(8): 3631-3640, 2022 Feb 28.
Article in En | MEDLINE | ID: mdl-35176862
ABSTRACT
The tetravalent-state stability of manganese is of primary importance for Mn4+ luminescence. Double perovskite-structured A2B'B″O6Mn4+ 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 Ca2MgWO6Mn. In this work, a cation-pair co-substitution strategy is proposed to replace 2Ca2+ by Na+-La3+ to form Ca2-2xNaxLaxMgWO6Mn. 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 CaNa0.5La0.5MgWO60.9%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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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Inorg Chem Year: 2022 Type: Article Affiliation country: China
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Inorg Chem Year: 2022 Type: Article Affiliation country: China