Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5398049 | Journal of Luminescence | 2017 | 5 Pages |
Abstract
Novel double perovskite Ca2MgWO6:Bi3+ (CMW:Bi3+) yellow-emitting phosphor is synthesized by solid-state reaction method in air. Host Ca2MgWO6 with excitation 297Â nm emits blue light and the chromaticity coordinate is (0.169, 0.160). The spectroscopic properties of CMW:Bi3+ phosphor are explained on the basis of the Bi3+ (6s2)-W6+ (5d0) metal-to-metal charge transfer (MMCT) transition. CMW:Bi3+ phosphor with excitation 338Â nm shows yellow light and the chromaticity coordinate is (0.383, 0.477). Broad emission band peaking at ~550Â nm of CMW:Bi3+ phosphor is observed in the range of 400-780Â nm due to the D â 1S0 radiative decay and the 3P1,0 â 1S0 transitions of Bi3+ ion. Monitored at 550Â nm, excitation spectrum of CMW:Bi3+ phosphor including a strong excitation peak at ~338Â nm covers the region from 200 to 400Â nm owing to the Bi3+ â W6+ MMCT transition and the 1S0 â 3P1 transition of Bi3+ ion. The optimal Bi3+ ion actual content is ~0.38Â mol%. Emission spectra of CMW:Bi3+ phosphor with excitation 338Â nm shows blue-shift with increasing temperature from 50 to 300Â K owing to the influence of temperature to electron transfer. The possible luminous mechanism of CMW:Bi3+ phosphor is analyzed by energy level diagram of Bi3+ ion in solid including d0 cation.
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Physical and Theoretical Chemistry
Authors
Renping Cao, Guanjun Quan, Zhihui Shi, Zhiyang Luo, Qianglin Hu, Siling Guo,