Highly twisted bipolar molecules for efficient near-ultraviolet organic light-emitting diodes via a hybridized local and charge-transfer mechanism

Near ultraviolet (NUV) electroluminescence (EL) is very important but seldom reported for being short of short-wavelength emitters. Herein, we report two highly twisted terphenyl-based donor–acceptor molecules exhibiting excellent thermal and morphological stability and nearly quantitative NUV lumin...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2023-02, Vol.11 (5), p.1733-1741
Main Authors: Zhong, Ziting, Liu, Zhangshan, Geng, Sinuo, Li, Huihui, Feng, Xin Jiang, Zhao, Zujin, Lu, Hua
Format: Article
Language:English
Subjects:
Charge transfer
Emitters
Luminescence
Near ultraviolet radiation
Organic light emitting diodes
Quantum efficiency
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Near ultraviolet (NUV) electroluminescence (EL) is very important but seldom reported for being short of short-wavelength emitters. Herein, we report two highly twisted terphenyl-based donor–acceptor molecules exhibiting excellent thermal and morphological stability and nearly quantitative NUV luminescence. Via a hybridized local and charge-transfer (HLCT) process, excellent NUV EL is achieved with a maximum external quantum efficiency of 6.97% and CIE x , y of (0.16, 0.06) in a nondoped OLED. The device shows excellent colour purity with a small full width at half maximum of 48 nm. Our research demonstrates that highly twisted structures can efficiently tune the luminescence wavelength of bipolar molecules to the NUV region and achieve high-performance NUV EL.
ISSN:2050-7526
2050-7534
DOI:10.1039/D2TC04421H