Optical Transitions and Internal Vibronic Frequencies of MnF 6 2 - Ions in Cs2SiF6 and Cs2GeF6 Red Phosphors
Optical Transitions and Internal Vibronic Frequencies of MnF 6 2 - Ions in Cs2SiF6 and Cs2GeF6 Red Phosphors
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DOI：
10.1149/1.3576124
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发表时间：
2011-06
影响因子：
3.9
通讯作者：
Y. Arai;S. Adachi
中科院分区：
文献类型：
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作者：
Y. Arai;S. Adachi
通过在HF/CsMnO 4 水溶液中化学蚀刻Si和Ge来合成Cs 2 SiF 6 :Mn 4+ 和Cs 2 GeF 6 :Mn 4+ 红色荧光粉。光致发光 (PL) 分析、PL 激发 (PLE) 光谱和拉曼散射技术用于研究磷光体的光学特性。 PLE 数据的 Franck-Condon 分析得出与 Mn 4+ 相关的光学跃迁，对于 Cs 2 SiF 6 :Mn 4+ 和 Cs 2 GeF 6 :Mn 而言，发生在 ∼2.39 和 ∼2.35 eV ( 4 A 2 → 4 T 2 ) 以及 ∼2.82 和 ∼2.79 eV (4 A 2 → 4 T 1 )分别为4+。与温度相关的 PL 测量在 20 至 450 K 范围内以 10 K 的增量进行，并且通过考虑玻色-爱因斯坦占据因子可以很好地解释所获得的结果。根据Cs 2 SiF 6 :Mn 4+ 和Cs 2 GeF 6 :Mn 4+ 的PL和拉曼散射光谱确定了一组完整的红外和拉曼活性频率v 1 ―v 6 。
Cs 2 SiF 6 :Mn 4+ and Cs 2 GeF 6 :Mn 4+ red phosphors are synthesized by chemically etching Si and Ge in aqueous HF/CsMnO 4 solutions. Photoluminescence (PL) analysis, PL excitation (PLE) spectroscopy, and Raman scattering techniques are used to investigate the optical properties of the phosphors. The Franck―Condon analysis of the PLE data yields the Mn 4+ -related optical transitions to occur at ∼2.39 and ∼2.35 eV ( 4 A 2 → 4 T 2 ) and at ∼2.82 and ∼2.79 eV ( 4 A 2 → 4 T 1 ) for Cs 2 SiF 6 :Mn 4+ and Cs 2 GeF 6 :Mn 4+ , respectively. Temperature-dependent PL measurements are performed from 20 to 450 K in increments of 10 K, and the obtained results are well interpreted by taking into account the Bose―Einstein occupation factor. A complete set of infrared and Raman active frequencies, v 1 ―v 6 , are determined from the PL and Raman scattering spectra of Cs 2 SiF 6 :Mn 4+ and Cs 2 GeF 6 :Mn 4+ .