Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 3, Issue 26, Pages 6836-6843Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc00923e
Keywords
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Funding
- Nature Science Foundation of China [21101175, 21171178, 91222106]
- Natural Science Foundation Project of Chongqing [2012jjA0438, 2014jcyjA50036]
- Fundamental Research Funds for the Central Universities [CQDXWL-2014-005]
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Very recently, a novel barium bismuth borate Ba6Bi9B79O138 (BBBO) was shown to be a new analogue of REBaB9O16 (RE = rare earth), which is a family of excellent phosphor hosts, because it has two types of cationic positions suitable for bi- and tri-valent activators (or sensitizers). In this study, we prepared Eu3+-to-Bi3+ substituted solid solutions Ba-6(Bi1-xEux)(9)B79O138 (0 < x < 1) and performed a systematic UV-photoluminescence investigation. As anticipated, efficient energy transfer occurs in the whole series of compounds and the majority of the energy absorbed by Bi3+ was transmitted to Eu3+, causing a great enhancement of Eu3+ emission. More interestingly, the Eu3+-to-Bi3+ substitution leads to a centrosymmetric-to-noncentrosymmetric transition of the local coordination symmetry of the trivalent cations due to the size difference between Eu3+ and Bi3+. This is observed in the synergetic changing of the wavelength of Bi3+ S-1(0) -> P-3(1) absorption (excitation spectra) and the red-to-orange emission ratio (emission spectra) when changing x. BBBO is a new polyborate host with a freshly resolved structure whose interesting preliminary results suggest the further development of BBBO-based phosphors.
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