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《Journal of The Chinese Rare Earth Society》 1987-04
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Liu Xingren, Wang Xiaojun, Shun Wufu, Wang Zongkai, Ma Long(Changchun Institute of Physics, Academia Sinica)  
Energy transfer from donor to accepor in solid state is an important subject in the study of luminescence and laser. Energy transfer phenomena and mechanisms from Ce~(3+) to Tb~(3+) have extensively been investigated in many compounds involving borates, aluminates, phosphates, silicates and fluorides etc, but information reported concerning the energy transfer from Tb~(3+) ion to Ce~(3+) ion is very rare. With the advance of laser and luminescence, yttrium aluminate(YAG)and yttrium gallate(YGG)garnets have been considered to be the excellent host materials. During studying on the luminescence of YAG:Ce,Tb phosphors, the authors discovered the Tb~(3+)→Ce~(3+)energy transfer in 1983(Refer. 6).In this paper the Tb~(3+)→Ce~(3+) radiative and radiationless energy transfer in YAG:Ce,Tb garnet phosphors have been investigated in detail under the excitation of ultraviolet radiation containing a 2660 pulse laser with a width of 10 ns at room temperature. New excitation band corresponding to the 4f→5d transition of Tb~(3+) is presented in the excitation spectrum of the Ce~(3+) emission in YAG: Ce, Tb (Fig. 1). The Tb~(3+)(donor)emission spectrum overlaps the Ce~(3+)(acceptor) excitation spectrum considerably.In the system of Y_3Al_5O_(12): Ce,Tb nonradiative transfer from Tb~(3+) to Ce~(3+) depletes the population of the excited state of Tb~(3+) and decreases the emission intensity and fluorescence lifetime from the ~5D_3 and ~5D_4 levels to the ~7F_J levels. These results in an increase of Ce~(3+) emission. The fluorescence lifetimes of the ~5D_3 and ~5D_4 levels of Tb~(3+) and the efficiency(η) of energy transfer from Tb~(3+) to Ce~(3+) in YAG have been measured by a 2660 pulse laser excitation(Table 1).Since the emision spectra of the ~5D_3→~7F_j and ~5D_4→~7F_6 transitions of the Tb~(3+) overlap the blue absorption band of the Ce~(3+) and the relative ratios of the fluorescence branches of(~5D_4→~7F_6)/(~5D_4→~7F_4)and(~5D_4→~7F_J)/(~5D4→~7F_4)vary obviously with the increse of Ce~(3+) concentration(Fig. 1 and Fig.3)thus the radiative energy transfer from Tb~(3+) to Ce~(3+) exists simultaneously in the system Y_3Al_5O_(12) Ce,Tb. Energy level diagrams and transfer pathways of Tb~(3+) and Ce~(3+) in Y_3Al_5O_(12) garnet are shown in Fig.4.The results obtained have provided some important information for the development of efficient luminescence materials.
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