Eu $^{2+}$激活荧光粉发射线宽的设计准则
Design rule for the emission linewidth of Eu$^{2+}$-activated phosphors
摘要：
我们从第一性原理出发研究了Eu $^{2+}$掺杂LED荧光粉的发光线宽。基于一维配置坐标模型，对15种化合物的第一性原理数据进行分析表明，在工作温度下，固体中Eu $^{2+}$发射带的线宽受量子效应的影响可以忽略不计，并且可以从Franck-Condon能移中提取。对于固定的Stokes位移，激发态和基态的Franck-Condon能移的差异是决定半高宽的关键因素。对于具有大正值的这种差异的情况，期望窄发射Eu $^{2+}$掺杂的LED磷光体。
英文摘要：
We study from first principles the emission linewidth of Eu$^{2+}$-doped LED phosphors. Based on the one-dimensional configuration coordinate model, an analysis of first principles data obtained for fifteen compounds show that, at working temperature, the linewidth of Eu$^{2+}$ emission band in solids is negligibly affected by quantum effects, and can be extracted from the Franck-Condon energy shifts. For a fixed Stokes shift, the difference of Franck-Condon energy shifts in the excited and ground states is the key factor for the FWHM determination. Narrow emission Eu$^{2+}$-doped LED phosphors are expected for the case with large positive value of such difference.
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