从热释光曲线同时确定电子复合与俘获之比及陷阱深度

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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 σ_０n₀/σν and the trap depth ε simultaneously from the glow curve. The authors found that σ₀n₀/σν=2.6 and ε=0.86 eV.

Key words：Luminescence decay kinetics;Monomolecular processes;Bimolecular processes;Thermo-luminescence;Trap depth

Received: 2004-04-09 Accepted: 2004-09-16

ZTFLH:

O433.4

Corresponding Authors: XU Zheng

Cite this article:

WANG Li-wei,XU Zheng,ZHANG Fu-jun, et al. Simultaneous Determination of Rate Ratio of Recombination to Capture and Trap Depth from Thermo-Luminescence of ZnS:Cu, Co [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(10): 1537-1541.

URL:

https://www.gpxygpfx.com/EN/Y2005/V25/I10/1537