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High-efficiency ultrapure green organic light-emitting diodes

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Abstract

To expand the color reproduction area of displays as stipulated in the Recommendation ITU-R BT.2020 for ultrahigh-definition displays, quantum dot- and perovskite-based LEDs have been intensively examined. However, it is difficult to satisfy the BT.2020 standard using quantum dot-LEDs, and the efficiency and operational stability of perovskite-based LEDs are insufficient. Herein, we report the first-ever organic LED that can emit ultrapure green light with high efficiency. The key to success is the combined use of a platinum-based pure green emitter and a boron-based host material. The optimized bottom-emitting OLED exhibited the maximum current efficiency of 84 cd A−1 with CIE xy coordinates of (0.27, 0.67). Furthermore, the CIE xy coordinates reached (0.18, 0.74) with the use of a top-emitting structure comprising a microcavity structure and an organic capping layer. The optimized top-emitting OLED exhibited a high current efficiency of 98 cd A−1 and CIE color coordinates of (0.18, 0.74) with a small angular color shift of Δxy = 0.03 at viewing angles of 0° to 60°. The newly developed ultrapure green OLED enabled the coverage of 91% of the BT.2020 standard in the CIE 1931 color gamut.

Graphical abstract: High-efficiency ultrapure green organic light-emitting diodes

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Publication details

The article was received on 15 Dec 2017, accepted on 26 Jan 2018 and first published on 29 Jan 2018


Article type: Research Article
DOI: 10.1039/C7QM00588A
Citation: Mater. Chem. Front., 2018, Advance Article
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    High-efficiency ultrapure green organic light-emitting diodes

    H. Fukagawa, T. Oono, Y. Iwasaki, T. Hatakeyama and T. Shimizu, Mater. Chem. Front., 2018, Advance Article , DOI: 10.1039/C7QM00588A

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