High-efficiency ultrapure green organic light-emitting diodes†,Materials Chemistry Frontiers

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High-efficiency ultrapure green organic light-emitting diodes†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-01-29 00:00:00 , DOI: 10.1039/c7qm00588a
Hirohiko Fukagawa _{1,

2,

3} , Taku Oono _{1,

2,

3} , Yukiko Iwasaki _{1,

2,

3} , Takuji Hatakeyama _{3,

4,

5,

6,

7} , Takahisa Shimizu _{1,

2,

3}

Affiliation

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 x–y coordinates of (0.27, 0.67). Furthermore, the CIE x–y 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.

中文翻译：

高效超纯绿色有机发光二极管†

为了扩大ITU-R BT.2020建议书中规定的超高清显示器的色彩再现范围，已经对基于量子点和钙钛矿的LED进行了深入研究。然而，使用量子点LED难以满足BT.2020标准，并且钙钛矿基LED的效率和操作稳定性不足。在此，我们报道了有史以来第一个可以高效发射超纯绿色光的有机LED。成功的关键是铂基纯绿色发射体和硼基主体材料的结合使用。经过优化的底部发射OLED的最大电流效率为84 cd A ^-1，CIE x – y坐标为（0.27，0.67）。此外，CIE x –使用包括微腔结构和有机覆盖层的顶部发射结构，y坐标达到（0.18，0.74）。优化的顶部发射型OLED在0°至60°的视角下表现出98 cd A ^-1的高电流效率和（0.18，0.74）的CIE颜色坐标，并且具有较小的角度色移Δxy = 0.03。新开发的超纯绿色OLED在CIE 1931色域中实现了BT.2020标准的91％的覆盖率。

更新日期：2018-01-29

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