Yb3+/Li+共掺Y2O3纳米颗粒的1 μm光致发光机制

通过甘氨酸燃烧法制备了Yb3+/Li+共掺的Y2O3纳米颗粒，研究了940 nm半导体激光器激发下的Yb3+ 1 μm附近的光致发光光谱，结果表明1 μm附近的荧光峰在共掺Li+的摩尔分数为5%时达到最强，比不掺杂Li+离子时增强了大约12倍。分析了X射线主衍射峰的移动，结果表明Li+离子的掺杂改变了Yb3+离子的晶体场环境。求解了稳态速率方程，结果表明荧光增强的主要原因是掺杂的Li+离子扰乱了发光中心Yb3+离子在Y2O3晶格中的环境，打破了发光跃迁选律，致使4f组态内电偶极跃迁增强，电偶极跃迁振子强度增大，从而导致基态吸收截面的增大。

Abstract

Y2O3 nanoparticles codoped with Yb3+/Li+ ions are synthesized by glycine combustion method. Codoping with 5% mole fraction of Li+ ions leads to about 12 times enhancement of the photoluminescence (PL) intensity around 1 μm under diode laser excitation of 940 nm. The movements of the X-ray main diffraction peak indicate that the codoping of Li+ ions changes the lattice environment of Yb3+ ions. Theoretical investigations based on the steady-state rate equations indicate that the PL enhancement arises mainly from the increased ground state absorption cross section of Yb3+ ions by codoping with Li+ ions. The codoping of Li+ ions can disturb the local crystal field around the Yb3+ ions in Y2O3 crystals, change the PL transition selection rules of Yb3+ ions, resulting in enhanced intra-4f electric-dipole transitions and oscillator strength, which leads to the increase of ground state absorption cross section.

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樊婷, 吕健滔, 李娜. Yb³⁺/Li⁺共掺Y₂O₃纳米颗粒的1 μm光致发光机制[J]. 光学学报, 2013, 33(s1): s116003. Fan Ting, Lü Jiantao, Li Na. Mechanism for 1 μm Photoluminescence in Yb³⁺/Li⁺ Codoped Y₂O₃ Nanoparticles[J]. Acta Optica Sinica, 2013, 33(s1): s116003.

Yb³⁺/Li⁺共掺Y₂O₃纳米颗粒的1 μm光致发光机制

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