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- Title
Host-Sensitized Photoluminescence and Coordination Environment Evolution in Ba<sub>6</sub>(Bi<sub>1- x</sub>Tb <sub>x</sub>)<sub>9</sub>B<sub>79</sub>O<sub>138</sub> (0 ≤ x ≤ 1).
- Authors
Li, Qiaoqi; Cong, Rihong; Gao, Wenliang; Yang, Tao
- Abstract
Borates are well-known candidates for optical materials and, here, we are particularly interested in Ba6Bi9B79O138 (BBBO), which has an interesting layered-type structure and Bi3+-containing characteristics that has prompt us to explore its host-sensitized photoluminescence (PL). Solid solutions of BBBO: xTb3+ (0 ≤ x ≤ 1) were prepared and its host-sensitized photoluminescence was confirmed, which is a result of the efficient Bi3+-to-Tb3+ energy transfer. Furthermore, an evolution of the coordination environments of the Bi3+/Tb3+ sites was observed when increasing x. This evolution was found to correlate to the variation of the PL spectra. In particular, the value of the ratio of cyan/green [defined as I(5D4→7F6)/ I(5D4→7F5) of Tb3+] was about 0.28 when x < 0.4, and it increased to 0.71 at x = 0.9 and thereafter remained almost constant. Ba6(RE0.3- yBi yTb0.7)9B79O138 (RE = La or Y, 0 ≤ y ≤ 0.3) were also prepared for better understanding of the host-sensitization effect and in both series, Ba6(RE0.1Bi0.2Tb0.7)9B79O138 show the highest emission.
- Subjects
PHOTOLUMINESCENCE; COORDINATION compounds; BORATES; CRYSTAL structure; ENERGY transfer
- Publication
European Journal of Inorganic Chemistry, 2015, Vol 2015, Issue 30, p5045
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201500622