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以真空热蒸镀的方法制备了基于八羟基喹啉铝(Alq3)为发光层的单层和双层有机电致发光器件,测试了器件在不同温度条件下其电致发光特性的变化,研究了器件性能的温度特性,详细分析了温度对器件电流传导机制的影响.结果表明,器件的电流-电压特性与陷阱电荷限制电流理论的预测很好地符合.此外,由于有机层内载流子迁移率和浓度都随着温度的增加而增加,导致Alq3器件的电流随温度单调上升.不同温度下Alq3器件的电流传导机制没有改变,但是电流-电压关系式中的幂指数m随温度无规则变化.由于温度上升会引起Alq3发光性能衰减,所以器件的发光亮度随温度略有上升,而发光效率随温度单调下降.电致发光光谱随温度上升出现微小的蓝移,其单色性的降低是来源于有机半导体材料本身的能级特征.
The single-layer and double-layer organic electroluminescent devices based on Alq3 as luminescent layer were prepared by vacuum thermal evaporation. The electroluminescent properties of the device under different temperatures were tested. The temperature characteristics of the device performance are analyzed in detail, and the influence of temperature on the conduction mechanism of the device is analyzed in detail.The results show that the current-voltage characteristics of the device are in good agreement with the trapped current-limited current theory.Furthermore, The mobility and concentration of Alq3 devices increase with the increase of temperature, which leads to the monotonous increase of current in Alq3 device. The current conduction mechanism of Alq3 device does not change at different temperatures, but the power exponent m in the current-voltage relationship Changes.As the temperature rise will cause Alq3 luminescence performance decay, so the device luminescence brightness increases slightly with the temperature, and luminous efficiency decreases monotonously with temperature.Electroluminescence spectrum with temperature rise slight blue shift, the monochromaticity decreased Is derived from the energy level characteristics of the organic semiconductor material itself.