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采用真空蒸发的方法制备出玻璃衬底ITO／TPD／Alq／A1结构的有机发光器件(OLED)。改变有机层的厚度, 比较不同厚度下OLED的各项性能的差异,包括工作电压,发光效率。实验发现无论增大空穴传输层TPD的厚度 抑或是发光层Alq的厚度都会增大器件的工作电压。发光层Alq厚度的增大还能引起发光效率的增大,而TPD厚 度的增大对发光效率的影响则是复杂的。对于上述现象用隧穿理论以及直带模型进行了解释。对制备高亮度, 高效率低损耗的OLED具有指导意义。
A glass substrate ITO / TPD / Alq / Al structure organic light emitting device (OLED) was prepared by vacuum evaporation. The thickness of the organic layer is changed to compare the performance of the OLED under different thicknesses, including working voltage and luminous efficiency. It was found experimentally that increasing the thickness of the hole transporting layer TPD or the thickness of the light emitting layer Alq increases the operating voltage of the device. The increase of the thickness of the light-emitting layer Alq also causes the increase of the luminous efficiency, while the increase of the thickness of the TPD has a complicated effect on the luminous efficiency. The above phenomenon is explained by the tunneling theory and the straight-line model. The preparation of high brightness, high efficiency and low loss OLED has guiding significance.