Improved out-coupling efficiency and low haze of organic light-emitting diode (OLED) lighting with an auxiliary electrode are demonstrated by selective microlens arrays (SMLAs). The microlens arrays, aligned with the auxiliary electrode, were selectively fabricated, since the fully packed microlens arrays lead to OLED lighting with high haze. The external quantum efficiency and power efficiency of the devices with the SMLAs increased by 32% when compared with the devices without these arrays. Using the SMLAs, dark grid lines in the emission region became brighter, with a low haze, and the spectra of the emitted light had no shift.
© 2013 Optical Society of America
Original Manuscript: August 27, 2013
Manuscript Accepted: September 6, 2013
Published: October 11, 2013
Ju Hyun Hwang, Tae Hyun Park, Hyun Jun Lee, Kyung Bok Choi, Young Wook Park, and Byeong-Kwon Ju, "Low-haze light extraction from organic light-emitting diode lighting with auxiliary electrode by selective microlens arrays," Opt. Lett. 38, 4182-4185 (2013)