A Bipolar Host Based High Triplet Energy Electroplex For An Over 10 ...

A bipolar host based high triplet energy electroplex for an over 10 000 h lifetime in pure blue phosphorescent organic light-emitting diodes†

Mina Jung,a Kyung Hyung Lee,a Jun Yeob Lee *a and Taekyung Kim b Author affiliations

* Corresponding authors

a School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, Republic of Korea E-mail: [email protected]

b Department of Materials Science and Engineering, Hongik University, Sejong, South Korea

Abstract

Ultimate device performances of blue phosphorescent organic light-emitting diodes, an external quantum efficiency of 27.6%, a device lifetime over 10 000 h at 100 cd m−2, and pure blue color coordinates of (0.12, 0.13), were simultaneously achieved using a device architecture employing an electroplex host. A high triplet energy electron transport type host derived from a triazine core, a carbazole substituent, and a triphenylsilyl blocking unit was newly synthesized for the purpose of developing the high emission energy electroplex host. The electroplex host functioned as a carrier balancing host for high external quantum efficiency and a lifetime extending host of pure blue phosphorescent organic light-emitting diodes. This work demonstrates ultimate device performances, high external quantum efficiency and long lifetime, in pure blue phosphorescent organic light-emitting diodes. In particular, the lifetime limit of pure blue phosphorescent organic light-emitting diodes was overcome by demonstrating an over 10 000 h lifetime.

• This article is part of the themed collections: Materials Horizons 10th anniversary regional spotlight collection: Asia-Pacific and Materials Horizons Lunar New Year collection 2021

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