用高压显微光谱系统研究(Zn0.85Cd0.15)S:Cu,Al磷光体在流体静压力下施主-受主对的发光

用金刚石对顶砧高压显微光谱系统在室温和1bar—66kbar的流体静压力范围内研究了(Zn_0.85Cd_0.15)S:Cu,Al磷光体的发光峰位置和相对发光强度随压力而变化的规律。随着压力的增加,发射峰值波长迅速移向短波方向,而发射峰值对应的光子能量随压力增加的速率为4.7meV/kbar(38cm^-1/kbar)。这个值比该材料的吸收边随压力增加的速率要小。随着压力的增加,该磷光体的发光峰值相对强度急骤下降,当压力从常压升到66kbar时,发光峰值相对强度下降到原值的6％。这些结果可以用Al³⁺-Cu⁺的施主-受主对模型来解释。本文还估计施主(Al³⁺)和受主(Cu⁺)的激活能之和随压力增加的速率为3.7meV/kbar(30cm^-1/kbar)。 关键词：

STUDY ON THE DEPENDENCE OF DONOR-ACCEPTOR LUMINESCENCE OF (Zn0.85Cd0.15)S: Cu, Al PHOSPHOR ON HYDROSTATIC PRESSURE USING HIGH-PRESSURE MICROSPECTROSCOPIC SYSTEM

The dependences of luminescence peak shift and relative emission intensity of (Zn_0.85Cd_0.15)S:Cu, Al phosphor on hydrostatic pressure have been studied at room temperature with a high-pressure microspectroscopic system in conjunction with the gasketed diamond anvil cell, using the methanal ethanal mixture as pressure liquid, the hydrostatic pressure ranging 1bar-66 kbar was monitored by ruby R-line shift. The emission peak E(r) of (Zn_0.85Cd_0.15)S:Cu, Al shift to higher energy with increasing pressure, dE(r)/dP=4:.7 meV/kbar (38 cm^-1/kbar), but less strongly than does the absorption edge of the host. The relative emission intensity decreases strongly with increasing pressure, decreasing by 6% when pressure increasing from 1bar to 66 kbar. The results can be explained in terms of Al³⁺-Cu⁺ donor-acceptor pair model. Finally, we estimate that dE_D(Al³⁺)/dP+dE_A(Cu⁺)/dP=3.7 meV/kbar (30cm^-1/kbar).