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Er3+掺杂Ge25Ga10S65玻璃的中红外发光及多声子弛豫
作者:黄正裕1 2 戴世勋1 徐铁峰1 王训四1 聂秋华1 沈祥1 
单位:1. 宁波大学信息科学与工程学院 浙江 宁波 315211 2. 中国人民解放军91765部队 浙江 温州 325011 
关键词:硫卤玻璃 中红外发光 稀土掺杂 多声子弛豫率 
分类号:TQ171
出版年,卷(期):页码:2010,38(12):2236-2240
DOI:
摘要:

用熔融急冷法制备系列掺杂不同KBr含量且一定量Er3+浓度的Ge25Ga10S65硫卤玻璃,测试样品折射率、吸收光谱及近中红外荧光光谱。通过吸收光谱计算Er3+吸收谱线的振子强度,应用Judd–Ofelt理论计算分析Er3+在不同系列Ge25Ga10S65玻璃的强度参数(Ωi, i = 2,4,6)和4I11/2能级的计算能级寿命(tc),并与测量能级寿命(tm)进行比较,研究其能级寿命的变化规律。结果表明:随着KBr浓度的增加,4I11/2的tc和tm均有所增加,tm = (6.61±0.19) ms,tc = 10.82 ms。研究样品玻璃中Er3+:4I11/2→4I13/2能级间跃迁过程中的多声子弛豫率(Wmp)跟KBr浓度之间的关系,结果表明:随着KBr浓度的增加,4I11/2→4I13/2能级间跃迁过程中的Wmp有所减小,为133~58/s。

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A series of chalcogenide glasses based on a Ge25Ga10S65 system doped with different concentrations of KBr and constant Er3+ were synthesized by the melt-quenching technique. Refractive indexes, absorption spectra and near & mid-infrared emission spectra were measured. Oscillation strength of absorption line of Er3+ was calculated according to the absorption spectra. Intensity parameters (Ωi, i = 2, 4, 6) and theoretical lifetimes (tc) of 4I11/2 energy level of Er3+ were calculated by employing the Judd–Ofelt theory. Comparison of the tc with the measured lifetimes (tm) reveals that both measured and theoretical lifetimes increase as the KBr concentrations increase, and the maximum tm and tc values are (6.61±0.19) ms and 10.82 ms. A decrease in multiphonon relaxation rates with addition of KBr is associated with an increase of 4I11/2→4I13/2 manifolds width of Er3+. The multiphonon relaxation rate (Wmp) was 133–58/s.

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基金项目:
国家自然科学基金(60878042,60978058);浙江省杰出青年基金(R1101263);宁波市科技创新团队(2009B21007)及宁波大学王宽诚幸福基金资助项目
作者简介:
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参考文献:

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