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光谱学与光谱分析

Pr(上標 3+)：Y2SiO5中的反斯托克斯熒光譜及其對基態Stark分裂能級的確定

張衍亮, 孫真榮, 李玉瓊, 丁良恩, 王祖賡

Published Apr 1, 2004• 0 citations
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Abstract

In the Pr(superscript 3+) -doped Y2SiO5, the population in 1D2 of Pr(superscript 3+) can be transferred to 3P0 state via non-radiative energy transfer by the laser excitation in resonance with 3H4→1D2, and we can experimentally study the Stark splitting of 3H4 energy level via 3P0→3H4 anti-Stokes emission spectra. Because the anti-Stokes emission spectra can avoid the energy transfer between different crystallographic site 1D2 energy levels, the above splitting lines attribution is more accurate than the assignment via 1D2→3H4 Stokes spectra by the laser excitation in resonance with 3H4. In addition, the character of the anti-Stokes fluorescence decay time was observed.

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In the Pr(superscript 3+) -doped Y2SiO5, the population in 1D2 of Pr(superscript 3+) can be transferred to 3P0 state via non-radiative energy transfer by the laser excitation in resonance with 3H4→1D2, and we can experimentally study the Stark splitting of 3H4 energy level via 3P0→3H4 anti-Stokes emission spectra. Because the anti-Stokes emission spectra can avoid the energy transfer between different crystallographic site 1D2 energy levels, the above splitting lines attribution is more accurate than the assignment via 1D2→3H4 Stokes spectra by the laser excitation in resonance with 3H4. In addition, the character of the anti-Stokes fluorescence decay time was observed.
In the Pr3+ -doped Y2SiO5, the population in 1D2 of Pr3+ can be transferred to 3P0 state via non-radiative energy transfer by the laser excitation in resonance with 3H4-->1D2 , and we can experimentally study the Stark splitting of 3H4 energy level via 3P0 -->3H4 anti-Stokes emission spectra. Because the anti-Stokes emission spectra can avoid the energy transfer between different crystallographic site 1D2 energy levels, the above splitting lines attribution is more accurate than the assignment via 1D2-->3H4 Stokes spectra by the laser excitation in resonance with 3H4-->1D2. In addition, the character of the anti-Stokes fluorescence decay time was observed.
Anti-Stokes fluorescence from the 3 P 0 level of impurity ions was detected in Pr 3+ : Y 2 SiO 5 , Pr 3+ : Lu 2 SiO 5 , and Pr 3+ : Gd 2 SiO 5 crystals non-resonantly pumped by laser radiation with a certain power density. The integrated intensity of the anti-Stokes fluorescence depends nonlinearly on the pump power density. As the atomic concentration of impurity ions was increased from 0.3% to 0.6% and 1.8%, the anti-Stokes fluorescence intensity was saturated due to the concentration quenching of the 1 D 2 term of the impurity Pr 3+ ions. The anti-Stokes fluorescence and quenching of the 1 D 2 term occur due to the cross relaxation of the electronic energy of excited terms of the Pr 3+ ions.
掺杂在晶体Y2SiO5 (YSO)中的Pr3+, 运用脉冲激光激发3H4→1D2跃迁,粒子通过非辐射能量转移从能级 1D2转移到能级 3P0, 测得了对应于 3P0→3H4跃迁的反斯托克斯荧光光谱, 由此可确定 3H4的Stark分裂能级以及 3P0能级的能量高度. 与运用激光激发 3H4→1D2跃迁, 通过观察 1D2→3H4斯托克斯荧光光谱确定3H4的Stark分裂能级方法相比, 该过程避免了不同晶点位置中(Crystallographic site)Pr3+的 1D2能级间的能量转移影响, 从而具有较高的确定性. 同时, 我们观察了反斯托克斯荧光的时间特性.
Yttrium aluminum garnet (YAG): Pr3+ is synthesized by codeposition me thod. Vacuum ultraviolet (VUV) excitation and emission spectra of YAG: Pr3+ at different temperatures are measured using synchrotron radiation as an excitation source. We analyze the transition process after excitation to 4f5d en ergy band and estimate the Huang-Rhys factor S and phonon energy ηω of YAG: Pr 3+ by multi-phonon relaxation. Emission of self-trapped exciton (STE) and 3P0→3H4,5,6 emission transferr ed from the STE energy appear when YAG: Pr3+is excited by 170nm, whic h is a different transition process from those excited by 240nm and 289nm.
In a Y2SiO5:Pr3+ crystal characterized by two non-equivalent Pr3+ optical centers, the interaction mechanisms between Pr3+ ions as well as between Pr3+ ions and a crystal lattice have been studied. It has been shown that along with the electron-phonon interaction, the interaction between Pr3+ ions and two-level systems made an additional contribution to the homogeneous linewidth of the 3H4↔3P0 optical transition. Two different mechanisms of the Pr3+ interionic coupling have been found. The first mechanism is associated with a dipole-dipole interaction between non-equivalent Pr3+ optical centers, while the other one is governed by a cooperative cross relaxation of the excitation energy among the same type Pr3+ optical centers.
We are interested, in this work, in determining the Stark sub-level of Er3+ ions doping a KY3F10 single crystal with a molar concentration of 1%. We have used a new method of measurement of energies of the ground level and emitting levels from excitation and anti-Stokes emission spectra recorded at liquid nitrogen temperature. This technique is based on a spectral analysis of the anti-Stokes emissions recorded after selective excitation with a red dye tunable laser. Thus, we could determine the Stark sub-levels of the ground and the principal emitting levels in the infrared, visible and near-UV ranges with a very good precision.