Performance of Three-Layered Organic Light-Emitting Diodes Using the Hole-Transport and Injection Layer of TPD and Teflon-AF, and the Electron-Injection Layer of Li 2 CO 3 and LiF

• Published in: Transactions on electrical and electronic materials Vol. 18; no. 2; pp. 89 - 92
• Main Authors: Shin, Jong Yeol, Kim, Tae Wan, Kim, Gwi Yeol, Lee, Su Min, Hong, Jin Woong
• Format: Journal Article
• Language: Korean
• Published: 한국전기전자재료학회 25.04.2017
• Subjects: Electron-injection layer; Hole transport layer; LiF/Al cathode; Organic light-emitting diodes; Hole transport layer; Electron-injection layer; Organic light-emitting diodes; LiF/Al cathode
• ISSN: 1229-7607; 2092-7592

The performance of three-layered organic light-emitting diodes (OLEDs) was investigated using TPD hole-transport and injection layers, Teflon-AF, and the electron-injection layer of Li 2 CO 3 and LiF. The OLEDs were manufactured in a structure of TPD/Alq 3 /LiF, TPD/Alq 3 /Li 2 CO 3 , and AF/Alq 3 /LiF using low-molecular organic materials. In three different three-layered OLEDs, it was found that the device with the TPD/Alq 3 /LiF structure shows higher performance in maximum luminance, and maximum external quantum efficiency compared to those of the device with TPD/Alq 3 /Li 2 CO 3 and TPD/Alq 3 /LiF by 35% and 17%, and 193% and 133%, respectively. It is thought that the combined LiF/Al cathode contributes to a reduced work function and improves an electrical conduction mechanism due to the electron injection rather than the hole transport, which then increases a recombination rate of charge carriers.