Cai Jia-Heng, Tian Qi-Sheng, Zhu Xiao-Zhao, Qu Zhi-Hao, He Wei, Zhou Dong-Ying, Liao Liang-Sheng
Institute of Functional Nano & Soft Materials, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China.
Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa 999078, Macau, China.
Molecules. 2022 Sep 5;27(17):5723. doi: 10.3390/molecules27175723.
The effective reflective anode remains a highly desirable component for the fabrication of reliable top-emitting organic light-emitting diodes (TE-OLEDs) which have the potential to be integrated with complementary metal-oxide-semiconductor (CMOS) circuits for microdisplays. This work demonstrates a novel laminated anode consisting of a Cr/Al/Cr multilayer stack. Furthermore, we implement an ultra-thin titanium nitride (TiN) layer as a protective layer on the top of the Cr/Al/Cr composite anode, which creates a considerably reflective surface in the visible range, and meanwhile improves the chemical stability of the electrode against the atmosphere or alkali environment. Based on 2-(2-pyridinyl-N)phenyl-Ciridium(III) as green emitter and Mg/Ag as transparent cathode, our TE-OLED using the TiN-coated anode achieves the maximum current efficiency of 71.2 cd/A and the maximum power efficiency of 66.7 lm/W, which are 81% and 90% higher than those of the reference device without TiN, respectively. The good device performance shows that the Cr/Al/Cr/TiN could function as a promising reflective anode for the high-resolution microdisplays on CMOS circuits.
有效的反射阳极仍然是制造可靠的顶部发射有机发光二极管（TE-OLED）的非常理想的组件，这种二极管有潜力与用于微显示器的互补金属氧化物半导体（CMOS）电路集成。这项工作展示了一种由Cr/Al/Cr多层堆叠组成的新型叠层阳极。此外，我们在Cr/Al/Cr复合阳极顶部实施了一层超薄的氮化钛（TiN）层作为保护层，该层在可见光范围内形成了相当高反射率的表面，同时提高了电极在大气或碱性环境中的化学稳定性。基于2-(2-吡啶基-N)苯基-C铱(III)作为绿色发光体和Mg/Ag作为透明阴极，我们使用涂有TiN的阳极的TE-OLED实现了71.2 cd/A的最大电流效率和66.7 lm/W的最大功率效率，分别比没有TiN的参考器件高81%和90%。良好的器件性能表明，Cr/Al/Cr/TiN可以作为CMOS电路上高分辨率微显示器的一种很有前景的反射阳极。
