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Host‐Sensitized Photoluminescence and Coordination Environment Evolution in Ba 6 (Bi 1– x Tb x ) 9 B 79 O 138 (0 ≤ x ≤ 1)
Author(s) -
Li Qiaoqi,
Cong Rihong,
Gao Wenliang,
Yang Tao
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500622
Subject(s) - photoluminescence , chemistry , crystallography , boron , energy transfer , analytical chemistry (journal) , physics , chemical physics , optics , organic chemistry , chromatography
Borates are well‐known candidates for optical materials and, here, we are particularly interested in Ba 6 Bi 9 B 79 O 138 (BBBO), which has an interesting layered‐type structure and Bi 3+ ‐containing characteristics that has prompt us to explore its host‐sensitized photoluminescence (PL). Solid solutions of BBBO: x Tb 3+ (0 ≤ x ≤ 1) were prepared and its host‐sensitized photoluminescence was confirmed, which is a result of the efficient Bi 3+ ‐to‐Tb 3+ energy transfer. Furthermore, an evolution of the coordination environments of the Bi 3+ /Tb 3+ 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 ( 5 D 4 → 7 F 6 )/ I ( 5 D 4 → 7 F 5 ) of Tb 3+ ] was about 0.28 when x < 0.4, and it increased to 0.71 at x = 0.9 and thereafter remained almost constant. Ba 6 (RE 0.3– y Bi y Tb 0.7 ) 9 B 79 O 138 (RE = La or Y, 0 ≤ y ≤ 0.3) were also prepared for better understanding of the host‐sensitization effect and in both series, Ba 6 (RE 0.1 Bi 0.2 Tb 0.7 ) 9 B 79 O 138 show the highest emission.