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首页> 外文会议>Symposium on Structure and Dynamics of Glasses and Glass Formers held December 2-6, 1996,Boston, Massachusetts,U.S.A >Spectral characterization and excited-state interactions between rare earth ions doped in borosilicate and sol-gel glasses: energy transfer up-conversion in the Pr-Sm system
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Spectral characterization and excited-state interactions between rare earth ions doped in borosilicate and sol-gel glasses: energy transfer up-conversion in the Pr-Sm system

机译：硼硅酸盐和溶胶-凝胶玻璃中掺杂的稀土离子之间的光谱表征和激发态相互作用：Pr-Sm系统中的能量转移上转换

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摘要

Spectroscopic properties of selected 4f-elements in a sol-gel and two high temperature silicate based glasses are reported. In particular, the spectral properties of the Eu~3+ ion have been used to probe the local coordination environment of the f-elements in these glass matrices. Luminescence studies of the high temperature glasses indicated that the electric dipole allowed f-f transitions dominate the spectra which suggests that the local symmetry around the 4f-ions is low. Temperature-dependent spectroscopic studies of the sol-gel glasses indicated that the the f-elements retain a "solution-like" environment prior to thermal processing. After heat treatment, an increase in the emission intensities of the electric-dipole transitions is accompanied by a concomitant decrease in the magnetic-dipole allowedtransitions. moreover, excited state interactions has also been observed in the high temperature glasses that contain certain multiple f-elements. In Pr-Sm systems, exclusive excitation of the sm~3+ ion with a 514 nm argon ion laser line provides a higher energy emission band (ca. 490 nm) from the Pr~3+ ion (~3P_0 -> ~3H_4) transition. This energy up-conversion is attributed to energy transfer from the ~6H_13/2 level of the Sm~3= ion to the ~3H-6 state of the Pr~3+ ion. Following a second photon absorption. the Pr~3+ ion is excited to the emitting ~3P_0 level.
机译：报道了溶胶-凝胶和两种基于高温硅酸盐的玻璃中所选4f元素的光谱性质。特别是，Eu〜3 +离子的光谱特性已被用来探测这些玻璃基质中f元素的局部配位环境。高温玻璃的发光研究表明，电偶极子允许f-f跃迁占主导地位的光谱，这表明4f离子周围的局部对称性很低。溶胶-凝胶玻璃的温度依赖性光谱研究表明，在热处理之前，f元素保留了“类似溶液”的环境。热处理后，电偶极跃迁的发射强度增加，同时磁偶极允许跃迁也随之减少。此外，在含有某些多个f元素的高温玻璃中也观察到了激发态相互作用。在Pr-Sm系统中，用514 nm氩离子激光线对sm〜3 +离子的独家激发提供了Pr〜3 +离子（〜3P_0->〜3H_4）更高的能量发射带（约490 nm）。过渡。这种能量上转换归因于从Sm〜3 =离子的〜6H_13 / 2能级到Pr〜3 +离子的〜3H-6态的能量转移。在第二光子吸收之后。 Pr〜3 +离子被激发到发射〜3P_0能级。

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