Enhancing light extraction efficiency and color stability for OLED by truncated micro-cone array films

Wei-Chu Sun; Ben Hsu; Su-Hua Chen; Mao-Kuo Wei; Bo-Yen Lin

Results in Optics (Dec 2023)

Enhancing light extraction efficiency and color stability for OLED by truncated micro-cone array films

Wei-Chu Sun,
Ben Hsu,
Su-Hua Chen,
Mao-Kuo Wei,
Bo-Yen Lin

Affiliations

Wei-Chu Sun: Department of Materials Science and Engineering, National Dong Hwa University, Hualien 974301, Taiwan
Ben Hsu: Department of Materials Science and Engineering, National Dong Hwa University, Hualien 974301, Taiwan
Su-Hua Chen: Department of Materials Science and Engineering, National Dong Hwa University, Hualien 974301, Taiwan
Mao-Kuo Wei: Department of Materials Science and Engineering, National Dong Hwa University, Hualien 974301, Taiwan; Corresponding authors at: Department of Material Science and Engineering, Opto-Electronic Engineering, National Dong Hwa University, Hualien 974301, Taiwan.
Bo-Yen Lin: Department of Opto-Electronic Engineering, National Dong Hwa University, Hualien 974301, Taiwan; Corresponding authors at: Department of Material Science and Engineering, Opto-Electronic Engineering, National Dong Hwa University, Hualien 974301, Taiwan.

Journal volume & issue: Vol. 13
p. 100570

Abstract

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A newly truncated micro-cone array film as light extraction layer for organic light emitting diodes (OLEDs) has been developed, which was fabricated by process combined with photolithography, polydimethylsiloxane (PDMS) molding, self-assembled anti-adhesion, and ultraviolet (UV) forming techniques. In this study, by varying the sidewall angle and fill factor of this film, their influences on the optical properties and light extraction efficiency for OLED are fully investigated. As a result, device performance of OLED employed truncated micro-cone array film, with a high fill factor and sidewall angle of 76.49⁰, was found to be significantly enhanced up to 52% compared with the reference OLED. Notably, the proposed truncated micro-cone array film also stabilized emissive color stability while the viewing angle changes from 0° to 70°, achieving an excellent angular shift with CIE-indices of (0.0025, 0.0066). Aforementioned findings contribute to the development in advanced OLEDs for display and lighting applications.

Published in Results in Optics

ISSN: 2666-9501 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics: Optics. Light
Website: https://www.journals.elsevier.com/results-in-optics

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