Jump to main content
Jump to site search

Issue 4, 2018
Previous Article Next Article

High-efficiency ultrapure green organic light-emitting diodes

Author affiliations


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

Back to tab navigation

Supplementary files

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., 2018,2, 704-709

  •   Request permissions

    High-efficiency ultrapure green organic light-emitting diodes

    H. Fukagawa, T. Oono, Y. Iwasaki, T. Hatakeyama and T. Shimizu, Mater. Chem. Front., 2018, 2, 704
    DOI: 10.1039/C7QM00588A

Search articles by author