Simultaneous determination of trap depth and the ratio of the rate of recombination to that of capture from thermo-luminescence
Xu Zheng(徐征)a)b)†, Zhang Fu-Jun(张福俊)a), Zhao Su-Ling(赵谡玲)a), Wang Li-Wei(王丽伟)a), A. N. Georgobianic), V. B. Gutanc), and Meng Li-Jian(孟立建)b)
a Institute of Optoelectronics, Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China; b Departamento de Fisica, Instituto Superior de Engenharia do Porto, 4200-072 Porto, Portugal; c P. N. Lebedev Physical Institute of Russian Academy of Sciences, 117924, Moscow, Russia
Abstract Thermo-luminescence (TL) is a kind of luminescence decay measured with varying temperature. In the process of TL the decay parameter itself involves the temperature effect of traps. Thus the trap depth is inseparable from the decay parameter. There are two separate peaks in the TL curve of ZnS:Cu,Co if the measurement starts from liquid nitrogen temperature. In the experiment we started from zero Celsius temperature to isolate the deeper traps. We have proposed and realized three methods for simultaneous determination of trap depth and decay parameter based on the quasi-equilibrium model and experimental data. If we treat the case of kinetic order $\alpha$ =1 as $\alpha$ =2, the error might be as large as 100%.
Received: 16 January 2006
Revised: 20 April 2006
Accepted manuscript online:
(Charge carriers: generation, recombination, lifetime, and trapping)
Fund: Project supported by the National Natural
Science Foundation of China (Grant Nos 10374001, 10434030 and 60576016),
the State Key Development Program for Basic Research of China (Grant No
2003CB314707), the Excellent Doctor's Science and Technology Innovation
Foundation of Beijing Jiaotong University (Grant No 48011), Russian
Foundation of Basic Research (Grant Nos 04-02-16942 and 02-02-39007).
Cite this article:
Xu Zheng(徐征), Zhang Fu-Jun(张福俊), Zhao Su-Ling(赵谡玲), Wang Li-Wei(王丽伟), A. N. Georgobiani, V. B. Gutan, and Meng Li-Jian(孟立建) Simultaneous determination of trap depth and the ratio of the rate of recombination to that of capture from thermo-luminescence 2006 Chinese Physics 15 1883
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