Thermal analysis and optical transition of Yb^3+, Er^3+ co-doped lead–germanium–tellurite glasses
Thermal analysis and optical transition of Yb^3+, Er^3+ co-doped lead–germanium–tellurite glasses
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DOI：
10.1557/jmr.2004.0226
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发表时间：
2004-06
影响因子：
2.7
通讯作者：
Zhongmin Yang;Shiqing Xu;Jianhui Yang;Lili Hu;Zhong-hong Jiang
中科院分区：
文献类型：
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作者：
Zhongmin Yang;Shiqing Xu;Jianhui Yang;Lili Hu;Zhong-hong Jiang
本文研究了一种新的玻璃体系：0.05K_2O-0.1ZnO-0.1BaO-0.2PbO-xGeO_2-（0.55 - x）TeO_2（x = 0.1，0.2，0.3，0.4，0.5和0.55）铅锗碲酸盐玻璃。对该玻璃体系的差热分析表明，在玻璃转变温度（Tg）到玻璃熔化温度的较大温度范围内，GeO_2含量的增加使玻璃转变温度（Tg）升高，并抑制了玻璃的析晶倾向。最大振动频率介于锗酸盐和氟化物玻璃之间，在750 cm^−1到820 cm^−1之间。随后，对Yb^3+，Er^3+共掺的铅碲锗酸盐玻璃进行了光吸收、光致发光和上转换荧光的测量。结果表明，GeO_2取代TeO_2后，荧光光谱在1534 nm处的半高宽减小，辐射寿命增加。在976 nm处激发进入玻璃系统导致强烈的绿色发射和相对较弱的红色发射。随着GeO_2的加入，Er ~（3+）离子的^4 S_3/2和^4 F_9/2态之间的无辐射跃迁速率增加，从而使红光发射增强，绿色发射减弱。绿色和红色发光与激发光功率的二次关系表明，在976 nm激发下，该玻璃体系发生了双光子吸收过程。
In this article, we present a study of a new glass system: lead–germanium–tellurite glasses in the form of 0.05K_2O–0.1ZnO–0.1BaO–0.2PbO– x GeO_2–(0.55 - x )TeO_2 with x = 0.1, 0.2, 0.3, 0.4, 0.5, and 0.55. Differential temperature analysis of this glass system shows that increasing GeO_2 content raises the glass transition temperature (T_g) and suppresses the crystallization tendency in a large temperature range from T_g to the glass melting temperature. The maximum vibrational frequency is intermediate between germanate and fluoride glasses, in the range of 750 cm^−1 to 820 cm^−1. Subsequently, Optical absorption, photoluminescence, and upconversion fluorescence were measured for Yb^3+, Er^3+ co-doped lead–tellurium–germanate glasses. It was found that the full width at half-maximum of the fluorescence spectrum at 1534 nm decreases and the measured radiative lifetime increases with the replacement of TeO_2 by GeO_2. Excitation at 976 nm into the glass system leads to an intense green emission and a relatively weak red emission. With the addition of GeO_2, the increase of red fluorescence and the decrease of green emission in intensity are due to the increase of nonradiative transition rates between the^4 S _3/2 and^4 F _9/2 states of Er^3+ ions. The quadratic dependence of the green and red emissions on excitation power indicates that two-photon absorption process occurs in this glass system excited at 976 nm.