The energy transfer processes between the Er3+ and Tm3+ in Er,Tm-codoped-NaY(WO4)2 crystal
The energy transfer processes between the Er3+ and Tm3+ in Er,Tm-codoped-NaY(WO4)2 crystal
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DOI：
10.1016/j.optcom.2004.07.025
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发表时间：
2004-11-16
影响因子：
2.4
通讯作者：
Chen, HC
中科院分区：
文献类型：
--
作者：
Song, F;Su, J;Chen, HC
采用直拉法(CZ)提拉法制备了Er3+ Tm3+共掺NaY(WO4)(2)晶体。在室温下测量该晶体的吸收光谱、发射光谱和激发光谱。利用 Judd-Ofelt 理论从吸收光谱计算强度参数、自发发射概率、分支比和寿命等光学参数。详细分析了Er3+、Tm3+能级的跃迁过程和交叉弛豫： (1)G(4)(Tm3+) + I-4(15/2)(Er3+) --> F-3(2)(Tm3+) + I-4(15/2)(Er3+), (1)G(4)(Tm3+) + I-4(15/2)(Er3+) --> F-3(4)(Tm3+) + F-4(9/2)(Er3+) 和 H-3(4)(Tm3+) + I-4(15/2)(Er3+) --> 提出两个离子之间的 F-3(4)(Tm3+) + S-4(3/2)(Er3+) 或 H-2(11/2)。通过实验，我们发现，在该晶体中，Tm3+明显增强了Er3+在绿色和红色区域的发光。上述能量转移过程为Tm3+在Er3+掺杂激光材料中提供了潜在的应用。 (C) 2004 Elsevier B.V. 保留所有权利。
Er3+ Tm3+-codoped NaY(WO4)(2) crystal was prepared by using Czochralski (CZ) pulling method. Absorption spectra, emission spectra and excitation spectra of this crystal were measured at room temperature. Such optical parameters as intensity parameters, spontaneous emission probabilities, branch ratios and lifetimes are calculated from absorption spectra with Judd-Ofelt theory. Transition processes of the energy levels of Er3+, Tm3+ are analyzed in details and the cross-relaxations: (1)G(4)(Tm3+) + I-4(15/2)(Er3+) --> F-3(2)(Tm3+) + I-4(15/2)(Er3+), (1)G(4)(Tm3+) + I-4(15/2)(Er3+) --> F-3(4)(Tm3+) + F-4(9/2)(Er3+) and H-3(4)(Tm3+) + I-4(15/2)(Er3+) --> F-3(4)(Tm3+) + S-4(3/2)(Er3+) or H-2(11/2) between the two ions are put forward. Through the experiments, we have found that, in this crystal, Tm3+ strengthens luminescence of Er3+ in the green and red regions evidently. The above energy transfer processes provide potential applications of Tm3+ in Er3+-doped laser materials. (C) 2004 Elsevier B.V. All rights reserved.