In this study, we investigated the effect of a random nanostructure scattering layer (RSL) on the microcavity and light extraction in organic light emitting diodes (OLEDs). In the case of the conventional OLED, the optical properties change with the thickness of the hole transporting layer (HTL) because of the presence of a microcavity. However, OLEDs equipped with the an RSL showed similar values of external quantum efficiency and luminous efficacy regardless of the HTL thickness. These phenomena can be understood by the scattering effect because of the RSL, which suppresses the microcavity effect and extracts the light confined in the device. Moreover, OLEDs with the RSL led to reduced spectrum and color changes with the viewing angle.
© 2014 Optical Society of America
Original Manuscript: February 19, 2014
Revised Manuscript: May 2, 2014
Manuscript Accepted: May 2, 2014
Published: June 9, 2014
Jin-Wook Shin, Doo-Hee Cho, Jaehyun Moon, Chul Woong Joo, Jonghee Lee, Jin Woo Huh, Seung Koo Park, Jun-Han Han, Nam Sung Cho, Joohyun Hwang, Hye Yong Chu, and Jeong-Ik Lee, "Random nanostructure scattering layer for suppression of microcavity effect and light extraction in OLEDs," Opt. Lett. 39, 3527-3530 (2014)