Color Control of Pr3+ Luminescence by Electron-Hole Recombination Energy Transfer in CaTiO3 and CaZrO3

被引:42
作者
Barandiaran, Zoila [1 ,2 ]
Bettinelli, Marco [3 ,4 ]
Seijo, Luis [1 ,2 ]
机构
[1] Univ Autonoma Madrid, Inst Univ Ciencia Mat Nicolas Cabrera, Dept Quim, E-28049 Madrid, Spain
[2] Univ Autonoma Madrid, IFIMAC, E-28049 Madrid, Spain
[3] Univ Verona, Dipartimento Sci & Tecnol, I-37129 Verona, Italy
[4] INSTM, UdR Verona, I-37129 Verona, Italy
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2017年 / 8卷 / 13期
关键词
2ND-ORDER PERTURBATION-THEORY; RED LUMINESCENCE; CHARGE-TRANSFER; EXCITED-STATES; EMISSION; DEFECTS; PHOTOLUMINESCENCE; INTERVALENCE; ENHANCEMENT; CRITERION;
D O I
10.1021/acs.jpclett.7b01158
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Controlling luminescence in phosphors able to produce several emissions from different stable excited states determines their use in optical devices. We investigate the color control mechanism that quenches the greenish-blue emission in favor of the red one in the archetype phosphor CaTiO3:Pr3+. State-of-the-art ab initio calculations indicate that direct host-to-dopant energy transfer (released by electron-hole recombination following the interband excitation and structural reorganization) selectively populates the D-1(2) red luminescent state of Pr3+ and bypasses the P-3(0) greenish-blue emitter. Local defects can modulate the electron-hole recombination energy and therefore increase the red emission efficiency, as experimentally observed. The selection of red emission does not happen in CaZrO3:Pr3+ because the electron-hole recombination energy is much higher. The calculations could not support the widely accepted color control mechanism based on metal-to-metal charge transfer states. The conclusion sets new points of view for the color control of lanthanide activated inorganic phosphors.
引用
收藏
页码:3095 / 3100
页数:6
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