Journal of Applied Sciences ›› 1990, Vol. 8 ›› Issue (4): 309-314.
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LI BIN1, TIAN YIGUANG2, BAI YUBAI1
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Abstract: The luminophors of silicate (Li, Ca, Gd) SiO3:Eu, Bi were sythesised and luminescence properties of Bi3+, Eu3+, and Gd3+ ions were studied. The effects and regularities of Gd3+ ion on the luminescence of Eu3+ and Bi3+ ions were investigated. The study on the luminescence of silicates (Li, Ca, Gd) SiO3:Eu, Bi shows that there are energy transitions from Bi3+ ion to Eu3+ ion and that Bi3+ ions act as both sensitizers and co-activators and that the spectral energy distribution of the luminophors depends on the Gd3+ ion content. It is shown that Gd3+ ion can greatly promote the sensitive effect of Bi3+ on Eu3+ and turn the main emission of Eu3+ ion from 5D0-7F1 to 5D0-7F2 transition as the condensations of Gd3+ ion increase.Under UV excitation of 393 nm, the luminescence intensities of Eu3+ in Li0.3Ca0.4Gd0.268SiO3Eu0.025Bi0.007 are the same as or more than those of Y(V, P)O4:Eu for either 5D0-7F1 or 5D0-7F2 transition emission. The experiment results show that the optimum synthesis conditions are 950℃ and 4hrs fired twice for Li0.30 Ca0.40 Gd0.30SiO3:Eu, Bi and that silicate Li0.30 Ca0.40 Gd0.30 SiO3 is an excellent host lattice to obtain efficient photoluminescent materials.
LI BIN, TIAN YIGUANG, BAI YUBAI. STUDIES ON THE SYNTHESIS AND LUMINESCENCE PROPERTIES OF (Li,Ca,Gd) SiO3:Eu, Bi LUMINOPHORS[J]. Journal of Applied Sciences, 1990, 8(4): 309-314.
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