Ba6(Bi1−xEux)9B79O138 (0 ≤ x ≤ 1): synergetic changing of the wavelength of Bi3+ absorption and the red-to-orange emission ratio of Eu3+
作者： Qiaoqi Li , Rihong Cong , Xianju Zhou , Wenliang Gao , Tao Yang
DOI: 10.1039/C5TC00923E
关键词:
摘要: Very recently, a novel barium bismuth borate Ba6Bi9B79O138 (BBBO) was shown to be new analogue of REBaB9O16 (RE = rare earth), which is family excellent phosphor hosts, because it has two types cationic positions suitable for bi- and tri-valent activators (or sensitizers). In this study, we prepared Eu3+-to-Bi3+ substituted solid solutions Ba6(Bi1−xEux)9B79O138 (0 ≤ x 1) performed systematic UV-photoluminescence investigation. As anticipated, efficient energy transfer occurs in the whole series compounds majority absorbed by Bi3+ transmitted Eu3+, causing great enhancement Eu3+ emission. More interestingly, substitution leads centrosymmetric-to-noncentrosymmetric transition local coordination symmetry trivalent cations due size difference between Bi3+. This observed synergetic changing wavelength 1S0 → 3P1 absorption (excitation spectra) red-to-orange emission ratio (emission when x. BBBO polyborate host with freshly resolved structure whose interesting preliminary results suggest further development BBBO-based phosphors.
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