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Sci Technol Adv Mater. 2018 Nov 29;20(1):35-41. doi: 10.1080/14686996.2018.1551040. eCollection 2019.

Enhanced outcoupling in down-conversion white organic light-emitting diodes using imprinted microlens array films with breath figure patterns.

Author information

1
Department of Display Engineering, Pukyong National University, Busan, Republic of Korea.
2
Flexible Information Device Research Center, Electronics and Telecommunications Research Institute (ETRI), Daejeon, Republic of Korea.
3
Department of Creative Convergence Engineering, Hanbat National University, Daejon, Republic of Korea.
4
Robert Frederick Smith School of Chemical and Biomolecular Engineering, Cornell University, New York, NY, USA.
5
Department of Materials Science and Engineering, Yonsei University, Seoul, Republic of Korea.

Abstract

We demonstrate high-performance down-conversion microlens array (DC-MLA) films for white organic light-emitting diodes (OLEDs). The DC-MLA films are readily fabricated by an imprinting method based on breath figure patterns, which are directly formed on the polymer substrate with a novel concept. The DC-MLA films result in high-quality white light as well as enhanced light outcoupling efficiency for white OLEDs. The external quantum efficiency and power efficiency of OLEDs with DC-MLA films are increased by a factor of 1.35 and 1.86, respectively, compared to OLEDs without outcoupling films. Moreover, the white OLEDs with DC-MLA films achieve a high color-rendering index of 84.3. It is anticipated that the novel DC-MLA films fabricated by the simple imprinting process with breath figure patterns can contribute to the development of efficient white OLEDs.

KEYWORDS:

201 Electronics / Semiconductor / TCOs; 204 Optics / Optical applications, organic light-emitting diodes; 40 Optical, magnetic and electronic device materials; Organic light-emitting diodes; down-conversion; light extraction; outcoupling structures; white OLED

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