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《Chinese Journal of Luminescence》 2001-02
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Luminescence Properties of Pr~(3+) and Energy Transfer Characteristics of Pr~(3+)→Gd~(3+) in Sr_2SiO_4

CHU Ben li 1, LIU Xing ren 1, WANG Xiao jun 1, ZHANG Jia hua 1, JIANG Xue yin 2 (1 Laboratory of Excited State Processes, Chinese Academy of Sciences; Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences  
The samples in this paper were synthesized by high temperature solid state reaction technique. The luminescence of the 4f5d states of Pr 3+ doped in Sr 2SiO 4 and the characteristics of the energy transfer from Pr 3+ to Gd 3+ have been studied. In Sr 2SiO 4, the energy level of the lowest 4f5d band of the Pr 3+ located at about 36 000cm -1 , which was much lower than that of the free ions, and was below the 1S 0 energy level of the 4f 2 configuration, so when excited into the 4f5d band, there was possibility to get the radiation transition of the 4f5d states. The energy gap between the lowest 4f5d band and the 3P 2 level was about 14 000cm -1 , which was big enough that the non radiation from the 4f5d band to 3P 2 level was so small , the radiation transitions from 3P 0 and 1D 2 level was unobserved, which indicated that the efficiencies of the 4f5d→4f radiative transition was high. From 0mol to 0 01mol of Pr 3+ in Sr 2SiO 4, the emission strength became stronger with increasing the Pr 3+ concentration. From 0 01mol to 0 03mol, the emission strength was almost constant , which was due to the concentration quenching of Pr 3+ in Sr 2SiO 4. When excited by 240nm, the emission spectrum of Pr 3+ was consisted of three bands, which was from 260nm to 440nm, the three peaks were at about 276, 318 and 396nm which corresponded to the radiation transition from the lowest 4f5d band to 3H 4 , 3H 6 and 1G 4 , respectively. The excitation spectrum was from 200nm to 260nm, when employed Gaussian fit, three bands could be got, the peaks were at about 218,240 and 250nm, respectively. In Sr 2SiO 4, Pr, Gd, when excited by 240nm, the 311nm emission of Gd 3+ was observed which could not be got in Sr 2SiO 4∶Gd, the energy transfer from Pr 3+ to Gd 3+ happened. There were overlap between the transition of the 4f5d states to 3H 4 of Pr 3+ and the absorptive transition of the Gd 3+ 8S 2/7 → 6I , so the 6I levels took part in the energy transfer process. Because the oscillator strength of the 6I levels was 10~20 times stronger than that of the 6P levels, the energy transfer from Pr 3+ to Gd 3+ was more efficient than that of only the Gd 3+ 6P levels was included in the energy transfer process. When the concentration of Pr 3+ was constant, the Pr 3+ emission strength became weaker and the Gd 3+ emission strength became stronger with increasing the Gd 3+ concentration. When the Gd 3+ concentration is bigger than 0 07mol,the concentration quenching happened and the Gd 3+ emission strength decreased with increasing the Gd 3+ concentration.
【Fund】: 国家科委“863”资助项目 (ZJ0 0X14T)
【CateGory Index】: O482.31
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【Co-references】
Chinese Journal Full-text Database 10 Hits
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