Improvement of viewing angle dependence of bottom-emitting green organic light-emitting diodes with a strong microcavity effect

Nam Su Kim; Dae Yeong Kim; Jae Ho Song; Min Chul Suh

doi:10.1364/oe.403398

journal article Oct 06, 2020

Improvement of viewing angle dependence of bottom-emitting green organic light-emitting diodes with a strong microcavity effect

Nam Su Kim Dae Yeong Kim Jae Ho Song Min Chul Suh

Optics Express Vol. 28 No. 21 pp. 31686 · Optica Publishing Group

View at Publisher Save 10.1364/oe.403398

Abstract

The current efficiency and color purity of organic light-emitting diodes (OLEDs) can be easily improved by means of a microcavity structure, but this improvement is typically accompanied by a deterioration in the characteristics of viewing angle. To minimize the angular dependence of the color characteristics exhibited by these strong microcavity devices, we investigated the changes in the optical properties of the green OLED with a bottom resonant structure. This investigation was based on varying the hole transport layer and semitransparent anode thicknesses. The results of optical simulations revealed that the current efficiency and viewing angle characteristics can be simultaneously improved by adjusting the thickness of the two layers. Furthermore, optical simulations predicted that the angular color dependence could be limited to 0.019 in the International Commission on Illumination (CIE) 1976 coordinate system. This optimum condition yielded a current efficiency of ∼134 cd/A. To further reduce this color shift, a nanosized island array (NIA) was introduced through the dewetting process of cesium chloride. By employing NIAs, the color coordinate shift value was reduced to 0.016 in the CIE 1976 coordinate system, and a current efficiency of 130.7 cd/A was achieved.

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References

Details

Published: Oct 06, 2020
Vol/Issue: 28(21)
Pages: 31686
License: View

Authors

Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea

Department of Information Display, College of Science, Kyung Hee University, 26 Kyungheedae-Ro, Dongdaemoon-Gu, Seoul 02447, Republic of Korea

Funding

Ministry of Trade, Industry and Energy Award: 20010443

Cite This Article

Nam Su Kim, Dae Yeong Kim, Jae Ho Song, et al. (2020). Improvement of viewing angle dependence of bottom-emitting green organic light-emitting diodes with a strong microcavity effect. Optics Express, 28(21), 31686. https://doi.org/10.1364/oe.403398

Improvement of viewing angle dependence of bottom-emitting green organic light-emitting diodes with a strong microcavity effect

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