Simultaneous Determination of Rate Ratio of Recombination to Capture and Trap Depth from Thermo-Luminescence of ZnS:Cu, Co
WANG Li-wei1, XU Zheng1，2, 3*, TENG Feng1,ZHANG Fu-jun1, MENG Li-jian2,XU Xu-rong1
1. Institute of Optoelectronics, Beijing Jiaotong University, Beijing 100044, China 2. Departamento de Fisica, Instituto Superior de Engenharia do Porto, Porto, 4200-072, Portugal 3. Tianjin University Postdoctoral Working Station, Postdoctoral Working Station of Zhong-Huan San-Jin Ltd., Tianjin Economy and Technological Development Area, Tianjin 300457, China
Abstract：The recombination luminescence is in nature a bimolecular process, but the decay rule may be changing from that of mono-molecular to bimolecular rule, i.e., from exponential to hyperbolic rule, depending on the behavior of conduction electrons. This behavior is represented by relative rate of recombination with ionized centers to that of capture by traps. This relative rate depends partly on the intrinsic parameters of the specified materials, and partly on the concentration of conduction electrons supplied by traps. Each point of the TL curve is related to the material parameters and the release of electrons from traps. The ratio of relative rate of recombination to that of capture γ(ε)＝σ0n0/σ(ν-n) involves the parameter ε. They are inseparable and must be determined at the same time. In the present report, starting from the same sample ZnS:Cu, Co which has only one peak in its TL(i.e., only one kind of luminescent center and only one kind of traps), and the experimental value of σ/σ0=0.005，the authors use thermo-luminescence kinetics models and some mathematic tools to exactly estimate the ratio σ０n0/σν and the trap depth ε simultaneously from the glow curve. The authors found that σ0n0/σν=2.6 and ε=0.86 eV.
王丽伟1，徐 征1, 2，3*，滕 枫1，张福俊1，孟立建２，徐叙瑢1 . 从热释光曲线同时确定电子复合与俘获之比及陷阱深度[J]. 光谱学与光谱分析, 2005, 25(10): 1537-1541.
WANG Li-wei1, XU Zheng1，2, 3*, TENG Feng1,ZHANG Fu-jun1, MENG Li-jian2,XU Xu-rong1 . Simultaneous Determination of Rate Ratio of Recombination to Capture and Trap Depth from Thermo-Luminescence of ZnS:Cu, Co . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(10): 1537-1541.
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