Premium
Efficient Near‐Infrared (NIR) Organic Light‐Emitting Diodes Based on Donor–Acceptor Architecture: An Improved Emissive State from Mixing to Hybridization
Author(s) -
Wang Chu,
Li XiangLong,
Gao Yu,
Wang Lu,
Zhang Shitong,
Zhao Lijuan,
Lu Ping,
Yang Bing,
Su ShiJian,
Ma Yuguang
Publication year - 2017
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201700441
Subject(s) - materials science , electroluminescence , excited state , optoelectronics , diode , luminescence , acceptor , quantum efficiency , oled , near infrared spectroscopy , light emitting diode , fluorescence , optics , nanotechnology , atomic physics , physics , layer (electronics) , condensed matter physics
Herein, a high‐efficiency near‐infrared (NIR) material PXZ‐3‐NZP is designed and sythesized using the concept of hybridized local and charge‐transfer (CT) state (HLCT), which is composed of donor (D) and acceptor (A) moieties as well as 10‐substituted isomeride PXZ‐10‐NZP for the purpose of comparison and deep understanding on the essential difference of their excited state properties. As a result, the nondoped electroluminescent (EL) device of PXZ‐3‐NZP exhibits an excellent NIR emission (λ max = 738 nm) with a maximum external quantum efficiency (η EQE ) of 0.82% and a Commission International de L'clairage coordinate of (0.70, 0.29), which is record‐setting among NIR fluorescent organic light emitting diodes with similar EL chromaticity. Also, a high η EQE of 2.03% is achieved in a doped device with a deep red emission at λ max = 676 nm. As a comparison, PXZ‐10‐NZP shows far inferior performance to those of PXZ‐3‐NZP in both nondoped and doped devices, due to the instinct CT character of its S 1 excited state. In terms of excited state, HLCT state is exactly superior to mixed state in high‐efficiency luminescence, which is a particularly useful strategy to design narrow‐bandgap light‐emitting materials beyond energy gap law with donor–acceptor architectures.