CN-Modified Host Materials for Improved Efficiency and Lifetime in Blue Phosphorescent and Thermally Activated Delayed Fluorescent Organic Light-Emitting Diodes

Sung Yong Byeon; Ji Han Kim; Jun Yeob Lee

doi:10.1021/acsami.6b15502

CN-Modified Host Materials for Improved Efficiency and Lifetime in Blue Phosphorescent and Thermally Activated Delayed Fluorescent Organic Light-Emitting Diodes

ACS Appl Mater Interfaces. 2017 Apr 19;9(15):13339-13346. doi: 10.1021/acsami.6b15502. Epub 2017 Apr 10.

Authors

Sung Yong Byeon¹, Ji Han Kim¹, Jun Yeob Lee¹

Affiliation

¹ School of Chemical Engineering, Sungkyunkwan University , 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Korea.

PMID: 28362481
DOI: 10.1021/acsami.6b15502

Abstract

CN-modified host materials, 9-(2-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-carbazole-3-carbonitrile (o-CzCN) and 9-(3-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-carbazole-3-carbonitrile (m-CzCN), which can improve the external quantum efficiency and lifetime of both blue phosphorescent and thermally activated delayed fluorescent (TADF) emitters were developed. A molecular design approach to stabilize the molecular structure and reduce the energy gap produced two high triplet energy host materials of o-CzCN and m-CzCN compatible with the phosphorescent and TADF emitters. The new host materials lowered operation voltage, increased quantum efficiency, and elongated lifetime of both phosphorescent and TADF devices.

Keywords: blue device; delayed fluorescence; efficiency; host; lifetime.