Luminescence of Bound Excitons in Tellurium-Doped Zinc Sulfide Crystals
Luminescence of Bound Excitons in Tellurium-Doped Zinc Sulfide Crystals
复制标题
掺碲硫化锌晶体中束缚激子的发光
DOI：
10.1143/jjap.12.549
复制
发表时间：
1973
影响因子：
1.5
通讯作者：
S. Shionoya
中科院分区：
文献类型：
--
作者：
T. Fukushima;S. Shionoya
本文研究了ZnS：Te中束缚激子的发光性质，特别注意了单个和成对Te中心的性质以及它们之间的能量传递。根据发射光谱和激发光谱的镜像关系，计算了激子与这些中心的结合能。内禀激子的俘获截面在成对中心中比在单个中心中大大约50倍。计算了简单的一维位形坐标图，很好地解释了所观察到的发光性质。由于光谱重叠，从单个中心到成对中心的共振能量转移发生，发射衰减时间的测量提供了直接证据。此外，它表明，在温度高于约100 K的激子或自由电子空穴对热释放从一个单一的中心迁移到一个成对的中心，造成另一种类型的能量转移。
Luminescence properties of bound excitons in ZnS: Te are studied, paying special attention to the nature of the single and paired Te centers and energy transfer between them. From the mirror image relations of emission and excitation spectra the binding energies of an exciton to these centers are evaluated. The capture cross-section for an intrinsic exciton is about fifty times larger in a paired center than in a single center. Simple one-dimensional configuration coordinate diagrams are calculated, which explain well the observed luminescence properties. Resonance energy transfer from a single to a paired center takes place because of the spectral overlap, the measurement of emission decay time, presenting direct evidence. Further it is shown that at temperatures above about 100 K an exciton or a free electron-hole pair thermally released from a single center migrates to a paired center causing another type of energy transfer.