Abstract：Raman spectra of Tm3+∶YVO4,Ho3+∶YVO4 and Tm3+∶Ho3+∶YVO4 crystals were measured at room temperature by HRD-1 double grating monochromator, with the excitation laser beam were parallel and perpendicular to c axis, respectively. For the Ho3+∶YVO4,it was found that the Raman spectrum excited by laser beam perpendicular to axis c is stronger than that by parallel excitation, and because 488 nm laser was very close to the absorption peak of Ho3+,the competition between absorption and scattering results in the 475 cm-1 Raman mode weakening and external mode widening. It was also found that the most probable phonon energy focused on the 880 cm-1, which was brought about by the breathe mode of (VO4)3-. Like YAG, YVO4 is a kind of crystal with high phonon energy too. Comparing the luminescence of Tm3+∶YVO4 with that of Tm3+∶Ho3+∶YVO4,it was found that the intensity of Ho3+ 2.09 μm is about 4/5 of that of Tm3+ 1.85 μm, which means the sensitization efficiency of Tm3+ to Ho3+ was as high as up to 80%, and since the overlap between the luminescence of Tm3+ with the absorption of Ho3+ is quite small, the radiative energy transfer between them was very less possible, and most probability, this process was via the nonradiative, phonon-aided cross-relaxation between Tm3+ and near resonance energy transfer between Tm3+ and Ho3+.
Key words：Tm3+∶Ho3+∶YVO4;Raman spectrum;Energy transfer
杨文琴，郭丽花，冯尚源，陈金铠. 单、双掺钒酸钇晶体的Raman光谱与能量转移研究[J]. 光谱学与光谱分析, 2007, 27(03): 581-584.
YANG Wen-qin,GUO Li-hua,FENG Shang-yuan,CHEN Jin-kai. Research on Raman Spectra and Energy Transfer in Tm3+,Ho3+ Single and Co-Doped YVO4 Crystals . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(03): 581-584.
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