基于B3PyMPM∶Cs高效叠层OLED器件的制备

以B 3 PyMPM∶Cs/Al/HAT-CN作为电荷生成单元制备高效叠层绿色磷光有机电致发光器件,叠层器件的最大电流效率和最大流明效率分别为172.2 cd/A和111.0 lm/W,在5 mA/cm^2电流密度下,叠层器件的电压和亮度分别为传统器件的2.04倍和2.84倍.为了探究叠层器件性能优于传统器件的原因,研究了电荷生成单元内的电荷产生和注入过程,以及薄层铝对电子注入特性和电荷生成单元稳定性的影响.实验结果表明,电荷能够有效地在电荷生成单元内产生并顺利注入电子传输层中,B3PyMPM∶Cs和HAT-CN间Al薄层的插入能够进一步提高电子注入效率及器件结构的稳定性.

Preparation of Highly-efficient Tandem OLED Based on B3 PyMPM:Cs

Charge generation unit consisting of B3PyMPM∶Cs/Al/HAT-CN was employed to fabricate a highly-efficient tandem green phosphorescent organic light-emitting device.The maximum current efficiency and the maximum luminous efficiency of tandem organic light-emitting device are as high as 172.2 cd/A and 111.0 lm/W,respectively.At the given current density of 5 mA/cm^2,the voltage and luminance of the tandem device are 2.04 times and 2.84 times those of single-unit device.In order to explore the reason why the performance of tandem device is better than the single device,the charge generation and injection processes in charge generation unit,and the effect of ultrathin Al layer on electron injection capability and the stability of charge generation unit systemically were studied.Experimental results show that the charges can be efficiently generated in the charge generation unit and smoothly injected into the electron transport layer.The insertion of the thin layer of aluminum between B 3 PyMPM∶Cs and HAT-CN can increase both the electron injection and the device stability.