Multi-Resonance Induced Thermally Activated Delayed Fluorophores for Narrowband Green OLEDs

Yuewei Zhang; Dongdong Zhang; Jinbei Wei; Ziyang Liu; Yang Lu; Lian Duan

doi:10.1002/anie.201911266

Multi-Resonance Induced Thermally Activated Delayed Fluorophores for Narrowband Green OLEDs

Angew Chem Int Ed Engl. 2019 Nov 18;58(47):16912-16917. doi: 10.1002/anie.201911266. Epub 2019 Oct 15.

Authors

Yuewei Zhang¹, Dongdong Zhang¹, Jinbei Wei², Ziyang Liu¹, Yang Lu¹, Lian Duan¹

Affiliations

¹ Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, China.
² State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Avenue, Changchun, 130012, P. R. China.

PMID: 31553115
DOI: 10.1002/anie.201911266

Abstract

High-color-purity emissions with small a full-width at half-maximum (FWHM) are an ongoing pursuit for high-resolution displays. Though the flourishment of narrow-band emissive materials with multi-resonance induced thermally activated delayed fluorescence (MR-TADF) in the blue region, such materials have not validated their potential in other color regions. By amplifying the influence of skeleton and peripheral units, a series of highly efficient green-emitting MR-TADF materials are firstly reported. Peripheral units with electron-deficit properties can significantly narrow the energy gap for bathochromic emission without compromising the color fidelity. MR-TADF emitters with photo-luminance quantum yields of above 90 % with FWHMs of ≤25 nm are developed. The corresponding organic light-emitting diodes show maximum external quantum efficiency/ power efficiency of 22.02 %/ 69.82 lm W^-1 with excellent long-term stability.

Keywords: delayed fluorescence; full width at half maximum; green emitters; multi-resonance; thermal activation.

Abstract

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