High contrast flexible organic light emitting diodes under ambient light without sacrificing luminous efficiency

作者：Kim Sei Yong; Lee Jeong Hwan; Lee Jae Hyun; Kim Jang Joo^*

来源：Organic Electronics, 2012, 13(5): 826-832.

DOI：10.1016/j.orgel.2012.01.015

• High contrast OLEDs
• Flexible
• High luminous efficiency

We demonstrate a polarizer free high contrast ratio (CR) flexible top emitting organic light emitting diode (TOLED) using a periodic metal/dielectric anti-reflection (AR) cathode structure. The AR cathode was designed to have an asymmetric reflectance for the inward (low reflectance) and outward (high reflectance) directions of the OLED. The flexible AR-TOLED showed a sufficiently low luminous reflectance (6%), very high efficiency (86% of the TOLED without the AR structure), 1.75 times higher than the TOLED employing a circular polarizer, and extremely high durability upon repeated bending with a bending radius of 0.7 cm up to 10,000 times.

• 出版日期2012-5