The effect of site occupation and valence state of Bi on the luminescence properties of Bi-activated oxysulfide MZnOS (M = Ca, Ba) with layer structure

JOURNAL OF ALLOYS AND COMPOUNDS

卷:742

Article

Pan, Dong-Jie¹  Yang, Yun-Ling¹  Yang, Xue-Chun¹  Xu, Tao¹  Cui, Yuan-Yuan¹  Sun, Xin-Yuan²  Feng, He¹  Liu, Lian¹  Shen, Yu-Fang³  Zhao, Jing-Tai¹  Zhang, Zhi-Jun¹ 

[1] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China

[2] Jinggangshan Univ, Dept Phys, Jian 343009, Jiangxi, Peoples R China

[3] Guilin Univ Technol, Key Lab New Proc Technol Nonferrous Met & Mat, Minist Educ, Guilin 541004, Peoples R China

关键词: Luminescence;    MZnOS (M = Ca, Ba);    Bi-activated;    Oxysulfide;   

DOI  :  10.1016/j.jallcom.2018.01.374

来源: Elsevier

【 摘 要 】

A novel blue-green-emitting and red-emitting phosphor MZnOS: Bi, Li (M = Ca, Ba) have been prepared, and the correlation between site occupation, valence state of Bi in MZnOS and their luminescence properties was investigated. In MZnOS, M sites are the most suitable and stable sites for Bi to occupy according to the Rietveld refinement and first principle calculation. Bi is found to be in trivalent state in CaZnOS, but is a mixture of divalent and trivalent states in BaZnOS. Under 366 nm excitation, Bi - doped CaZnOS and BaZnOS show strongly broad emission bands with the peak at about 485 and 507 nm, respectively, attributing to the P-3(1,0) -> S-1(0) transition of Bi3+. However, another broad band emission with the peak at 627 nm is observed for BaZnOS: Bi, Li upon 297 nm excitation. The X-ray excited luminescence (XEL) of Bi in MZnOS exhibit the similar properties as observed under UV excitation. The thermal stability of MZnOS: Bi, Li is relatively good enough for practical application. MZnOS: Bi, Li show potential applications as blue-green and red emission phosphor for LED devices considering the suitable absorption and emission wavelength range, high stability, as well as low cost. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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