单、双掺钒酸钇晶体的Raman光谱与能量转移研究

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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

Received: 2006-01-08 Accepted: 2006-03-28

ZTFLH:

O657.3

Corresponding Authors: YANG Wen-qin E-mail: yangwq@fjnu.edu.cn

Cite this article:

YANG Wen-qin,GUO Li-hua,FENG Shang-yuan, et al. Research on Raman Spectra and Energy Transfer in Tm³⁺,Ho³⁺ Single and Co-Doped YVO₄ Crystals [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(03): 581-584.

URL:

https://www.gpxygpfx.com/EN/Y2007/V27/I03/581