Photoluminescence Properties of Europium-Terbium-Gadolinium-Hexafluoroacetylacetone Ternary Complexes Synthesized in-situ in Gel Glass
HU Quan2,SHENG Xia1,LIU Si-qian1,ZHANG Yan1,QIAN Guo-dong1*
1. Department of Materials Science and Engineering,State Key Lab of Silica Materials,Zhejiang University,Hangzhou 310027,China 2. Basic Medicine Devision,Hangzhou Normal University,Hangzhou 310018,China
Abstract：The luminescence property of the inorganic glass doped with rare earth complex has aroused a wide range of attention for a variety of technological applications such as optical devices,biomedicine,etc. In the present work,the ternary complexes of europium-terbium-gadolinium with hexafluoroacetylacetone (HFA) and triphenylphoshine oxide (TPPO),Eu1/2-xTb1/2-xGd2x(HFA)3(TPPO)2 (x=0 or 1/18),were synthesized in-situ in gel glasses to obtain transparent materials. The photoluminescence (PL) spectra were measured and the characteristic transitions of Eu3+ and Tb3+ observed. Due to the phonon assisted energy transfer between Gd3+ (bonding ligands),Tb3+ and Eu3+,the intensity ratios of europium luminescence band to terbium band vary remarkably with the measurement temperatures. In addition,the Frster mechanism has proven responsible for the energy transfer between Eu3+ and Tb3+. The complex-doped gel glass whose luminescence color changes with temperatures is promising for being used as temperature detector,biological probe and thermal-sensitive probe of optical fiber sensor.
Key words：Rare earth organic complex;Synthesis in-situ;Photoluminescence;Phonon assisted energy transfer
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