Abstract:In the paper, five ZnS∶Cu electroluminescent material specimens were prepared by adding 0.05%, 0.10%, 0.15%, 0.20% and 0.25% Cu+ to ZnS. From the sample’s thermoluminescence curve and luminance, the authors can see that with the variation of Cu+ concentration, the peak of thermoluminescence curve changed correspondingly. At first with the increase of Cu+ concentration, the peak of thermoluminescence curve rised gradually. When the Cu+ concentration was 0.05%, the peak of thermoluminescence curve was 124.15 which attainded max, when the Cu+ concentration was 0.25%, the peak of the curve of thermoluminesence forther decreased to 51. But the temperature corresponding to the peak of the curves of thermoluminesence didn’t change, which means that the depth of electron trap did not vary. The authors therefore conclude that excessive Cu+ results in a decline of luminance because the energy of trapped electrons turns into the transition without radiation, though the probability of trapping electrons increases and the life of photoelectrons shortens as the luminescence center increases. In this way, there is an optimal value for Cu+ concentration, which leads to the peak of the curves of thermoluminesence and the maximum of luminance.
李志强,田少华,宋伟朋,韦志仁,窦军红, 李 娟. Cu+浓度对ZnS:Cu电致发光材料热释光曲线的影响[J]. 光谱学与光谱分析, 2005, 25(10): 1730-1732.
LI Zhi-qiang, TIAN Shao-hua, SONG Wei-peng, WEI Zhi-ren, DOU Jun-hong, LI Juan. Effect of the Cu+ Concentration on the Curve of Thermoluminescence of ZnS:Cu Electroluminescent Material . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(10): 1730-1732.
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