Photoluminescence of Green Phosphors Gd2Ba3B3O12 Doped with Tb3+
ZHAO Wen-yu1，2, FAN Bin1*, LI Song-bo1，2, ZHANG Guo-bin3, DAI Ya-tang4
1. School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China 4. School of Materials Science and Engineering,Southwest University of Science and Technology, Mianyang 621000, China
Abstract：The green emitting phosphor, Gd2Ba3B3O12∶Tb3+ was synthesized with the method of high-temperature solid-state reaction. The phase structure and photoluminescence (PL) properties of the samples were characterized by The X-ray diffraction (XRD), vacuum ultraviolet spectrum and ultraviolet spectrum (VUV-UV). The results indicate that Tb3+ ion acting as the luminescent center inhabited the site of Gd3+ ion in the host of Gd2Ba3B3O12. The VUV-UV excitation spectrum consists of the two strong broad bands at about 160～200 and 200～250 nm and sharp lines at about 260～280 and 300～ 320 nm. The two strong broad bands were assigned to the host absorption and f—d transition of Tb3+. The sharp lines were ascribed to the f—f transition of Tb3+ and Gd3+. All the samples of Gd2Ba3B3O12∶Tb3+ exhibit strong green emission corresponding to 5D4→7F5 transition (543 nm) of Tb3+ under VUV-UV light excitation. Under 172 nm excitation, 15 mol% Tb3+ doped Gd2Ba3B3O12 sample exhibits strong green emission with good color purity (x=0.313 6, y=0.484 3) and a fitted a decay time τ around 2.98 ms. It can be concluded that this series of phosphors Gd2Ba3B3O12∶Tb3+ is a promising green vacuum ultraviolet (VUV) phosphor for plasma display panels (PDPs) and Hg-free fluorescent tubes application.
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