Abstract Luminescent properties of yttrium-aluminum garnet activated by different amount of europium (YAG:Eu3+) single crystals were studied by local cathodoluminescence (CL) technique. Samples were grown by flux method. CL spectra were obtained in the range from 400 to 800 nm with spectral resolution of 0.1 nm. The rise and decay kinetics of various CL bands were investigated. The concentration dependencies of CL intensity and decay times of transitions were plotted. The concentration quenching for 5D1-7F2 Eu3+ transition was observed at about 3.5 at.% of Eu by Y, and for 5D2-7F1 and 5D3-7F3 transitions – at about 2.5–3 at.% of Eu by Y. For transition 5D0-7F1 no concentration quenching was observed. The high-energy excitation capture efficiency by different energy levels of Eu3+ in YAG was estimated based on the dependence of the CL rise rate of these levels on the electron beam current density. It was found that 5D1 energy level excitation capture efficiency is about three times higher than that of the 5D0, 5D2 and 5D3 energy levels.

中文翻译：

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YAG 的动力学特性：电子束激发时的 Eu3+ 发射

摘要 采用局域阴极发光(CL)技术研究了不同量铕(YAG:Eu3+)单晶活化钇铝石榴石的发光特性。样品通过通量方法生长。CL 光谱在 400 至 800 nm 范围内获得，光谱分辨率为 0.1 nm。研究了各种 CL 带的上升和衰减动力学。绘制了 CL 强度和跃迁衰减时间的浓度依赖性。观察到 5D1-7F2 Eu3+ 跃迁的浓度猝灭发生在约 3.5 at.% Eu 由 Y 引起，而对于 5D2-7F1 和 5D3-7F3 跃迁 - 在约 2.5-3 at.% Eu 由 Y 引起。对于过渡 5D0 7F1 没有观察到浓度猝灭。基于这些能级的 CL 上升率对电子束电流密度的依赖性，估计了 YAG 中不同能级 Eu3+ 的高能激发捕获效率。发现5D1能级激发捕获效率比5D0、5D2和5D3能级高约三倍。