Opt Express. 2015 Nov 30;23(24):30701-8. doi: 10.1364/OE.23.030701.

Luminance uniformity study of OLED lighting panels depending on OLED device structures.

Optics express

Hyeong Woo Bae, Young Hoon Son, Byoung Yeop Kang, Jung Min Lee, Hyoungsik Nam, Jang Hyuk Kwon

PMID: 26698702 DOI: 10.1364/OE.23.030701

Abstract

This paper describes the luminance uniformity of OLED lighting panels depending on OLED device structures of single emission layer (single-EML), 2-tandem, and 3-tandem. The luminance distribution is evaluated through the circuit simulation and the fabricated panel measurement. In the simulation results with yellow-green color panels of 30 × 80 mm² emission area, a 3-tandem structure shows the lowest non-uniformity (1.34% at 7.5V), compared to single-EML (5.67% at 2.8V) and 2-tandem (2.78% at 5.3 V) structures at 1,000 cd/m². The luminance non-uniformity is germane to the OLED conductance showing that the high luminance-current efficiency is of the most importance to achieve the uniform voltage and luminance distribution. In measurement, a 3-tandem structure also achieves the most uniform luminance distribution with non-uniformity of 4.1% while single EML and 2-tandem structures accomplish 9.6%, and 6.4%, respectively, at ~1,000 cd/m². In addition, the simulation results ensure that a 3-tandem structure panel is allowed to be enlarged the panel size up to about 5,000 mm² for lower luminance non-uniformity than 10% without any auxiliary metal electrodes.

Publication Types

• Journal Article