Extracting internal modes of top emission organic light emitting diodes by using internal random mesoscopic wrinkles

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 96; pp. 163 - 168
• Main Authors: Jeong, Jong Chan, Woo, Kie Young, Cho, Hyunsu, Cho, Yong-Hoon, Cho, Nam Sung, Yang, Sung Yun, Moon, Jaehyun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.04.2021; 한국공업화학회
• Subjects: Light extraction; Mesoscopic wrinkle; Spectrum stability; Top emitting organic light emitting diode; 화학공학; Spectrum stability; Top emitting organic light emitting diode; Light extraction; Mesoscopic wrinkle
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2021.01.025

[Display omitted] •Mesoscopic wrinkles were applied to fabricate wavy TOLEDs to overcome shortages.•Wrinkles were formed spontaneously without patterning processes.•Wavy TOLEDs showed angular stabilized spectra and 39% efficiency enhancement. Angular electroluminescence spectra stabilized and efficiency enhanced top-emitting organic light-emitting devices (TOLEDs) were demonstrated using randomly distributed mesoscopic internal wrinkles. Compared to planar TOLEDs, wrinkled TOLEDs showed a faster exciton decay rate in the emissive layer and high rate of radiative recombination, which leads to enhanced efficiency. Our wrinkled TOLEDs showed angular spectral dependency (u′v′(θ)) of 0.0032, which is low enough to be imperceptible to the human eyes, and 38.7 % enhanced external quantum efficiency relative to the planar counterpart. The approach described here provides an effective scheme for improving TOLEDs and obviating the necessity of modifying the stack structure of the device.