Efficient narrowband electroluminescence based on a hetero-bichromophore thermally activated delayed fluorescence dyad. Issue 12 (4th March 2022)

• Record Type: Journal Article
• Authors: Yu, You-Jun; Zou, Sheng-Nan; Peng, Chen-Chen; Feng, Zi-Qi; Qu, Yang-Kun; Yang, Sheng-Yi; Jiang, Zuo-Quan; Liao, Liang-Sheng
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 12(2022)
• Page Start: 4941
• Page End: 4946
• Publication Date: 2022-03-04
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1tc05711a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A hetero-bichromophore thermally activated delayed fluorescence (TADF) emitter named BOQAO was designed and synthesized, which consists of two multi-resonance TADF (MR-TADF) cores, t BuBO and t BuQAO. Abstract : A hetero-bichromophore thermally activated delayed fluorescence (TADF) emitter named BOQAO was designed and synthesized, which consists of two multi-resonance TADF (MR-TADF) cores, t BuBO and t BuQAO. The short-range intramolecular charge transfer (ICT) characteristics of t BuBO and t BuQAO weaken its electron-donating and electron-withdrawing ability, respectively. Thus, weak long-range ICT from t BuBO to t BuQAO is established in BOQAO for holding blue fluorescence emission with a slight redshift, keeping a small FWHM, and maintaining the TADF properties, simultaneously. The simple doped devices exhibited high color purity with FWHMs of less than 35 nm in a wide doping ratio range from 1 wt% to 40 wt%. At a 5 wt% doping ratio, the device based on BOQAO exhibited the best device performance with an EQE of 21.8% and an FWHM of 32 nm. This work provides a simple and practical strategy for suppressing aggregation-induced spectral broadening for the development of MR-TADF.