Publisher: John Wiley & Sons Inc
E-ISSN: 1099-0682|2015|30|5045-5052
ISSN: 1434-1948
Source: EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (ELECTRONIC), Vol.2015, Iss.30, 2015-10, pp. : 5045-5052
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Abstract
AbstractBorates 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–yBiyTb0.7)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.