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采用射频(RF)反应共溅射法制备了a-SiOxNy∶Er3+薄膜,在不同温度下进行退火处理,并测量了样品的可见及红外发光PL谱,观察到Er3+在550nm、525nm和1532nm的发光以及基质在620nm和720nm的发光.发现退火能明显增强Er3+的发光且对可见和红外发光的影响不同,讨论了退火明显增强Er3+发光及退火对可见和红外发光影响不同的机理.测量了Er3+可见发光的变温PL谱,讨论了退火对Er3+不同能级辐射跃迁几率的影响.根据基质发光随退火温度的变化,分析了基质发光峰的起源. 相似文献
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通过数值模拟的方法计算了圆坯感应加热过程的温度分布情况,研究了线圈匝数、聚磁体、坯料表面与空气的对流换热等因素对感应加热的影响。结果表明,线圈匝数对坯料温度分布有较大的影响,为了得到相对均匀的温度分布需选择合理的线圈匝数;感应加热中采用聚磁体,可显著提高坯料端部温度,消除坯料端部温度偏低的现象;同时,计算了感应加热过程的磁场分布,解释了坯料温度分布和变化的原因,并提出控制感应加热过程坯料温度的合理措施。 相似文献
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Properties of Local Structure Surrounding Eu3+ Ion in Various Niobate-Silicate Glasses 总被引:3,自引:0,他引:3
A Series of niobate-silicate glasses doped with Eu3 ions were prepared. The emission, phonon-side band spectra, fluorescence line narrowing spectroscopy and fluorescence lifetimes in these glasses were studied. The intensity parameters and crystal field parameter of Eu3 were obtained. The results indicate that the intensity ratio of the electric-dipole to magnetic-dipole transition and the intensity parameter Ω2 increase with the increasing concentration of Nb2Os, indicating that the symmetry becomes lower, the Eu-O bonds become stronger and the covalency of Eu-O bond increases. The value of B20 decreases with the increasing concentration of Nb2O5, indicating that the distance between the Eu3 ion and oxygen decreases and the Eu-O bond becomes strong, corresponding to the results of the former. As the concentration of Nb2O5 increases, the electron-phonon coupling becomes stronger, thus the nonradiative transition rate of 5Do becomes larger and the lifetime of 5D0 becomes shorter. 相似文献
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