【摘要】 通过对不同掺杂浓度Yb:YAG晶体的透过光谱、激发光谱、发射光谱和衰减时间的测量,研究了Yb:YAG晶体的UV发光特性和发光机制。Yb:YAG晶体在紫外波段具有宽的激发带和发射带。最强的发射峰位于320-350nm波长范围,此即为Yb:YAG晶体的闪烁发光峰;次强的发射峰位于500nm附近。Yb:YAG晶体的UV发光衰减时间小于50ns.Yb:YAG晶体的UV发光行为是电子从Yb3+离子的4f壳层向配体O2-的满壳层的分子轨道迁移的结果,属于电荷迁移(CT)发光。更多还原

【Abstract】 UV emission properties and mechanism of Yb:YAG scintillation crystal were studied by measuring transmission spectra, excitation spectra, emission spectra and decay time of Yb:YAG crystal. Yb:YAG crystal has broad emission band and the strongest emission peak locates in the range of 320-350nm. Additionally, it has another weak emission peak near 480-500nm. The decay time for UV emission of Yb:YAG crystal with different doping levels is less than 50ns. The UV emission mechanism of Yb:YAG crystal can be ascribed to the charge transfer luminescence, which is caused by the transfer of electrons from the ligands O2 - to the central metal ion Yb3+ .更多还原