Solution-Processed Pure Blue Thermally Activated Delayed Fluorescence Emitter Organic Light-Emitting Diodes With Narrowband Emission.

Ting Xu,Guohua Xie,Xiao Liang

doi:10.3389/fchem.2021.691172

Abstract

There is a need to satisfy the high color purity requirement of display technology with a simply fabricated process. Herein, solution-processed blue thermally activated delayed fluorescence organic light-emitting diodes (OLEDs) with a narrow spectrum with a full width at half maximum (FWHM) of 32 nm and y color coordinate below 0.2 are demonstrated by employing a molecule containing boron and nitrogen atoms (TBN-TPA) as the guest emitter in the emissive layer. The opposite resonance positions of B-N atoms of TBN-TPA endows a multi-resonance effect, leading to high color purity.

Highlights

Solution-processed organic light-emitting diodes (s-OLEDs) are regarded as one of the most fascinating and competitive technologies for large-area and low-cost display panels and solid-state lighting sources (Müller et al, 2003; So et al, 2008; Zhu et al, 2011; Sasabe and Kido, 2013; Zheng et al, 2013; Xu et al, 2017a; Xu et al, 2019; Wang et al, 2020; Xu et al, 2021)
Solution-processed blue thermally activated delayed fluorescence (TADF) OLEDs with a narrow bandwidth have been demonstrated by applying a molecule TBN-TPA (Liang et al, 2018) containing boron and nitrogen (B-N) atoms
Our results provided new understanding of the electroluminescence of blue multi-resonance TADF (MR-TADF) emitter, which would be beneficial to the development of solution-processed OLED technology for high-performance displays

Summary

Introduction

Solution-processed organic light-emitting diodes (s-OLEDs) are regarded as one of the most fascinating and competitive technologies for large-area and low-cost display panels and solid-state lighting sources (Müller et al, 2003; So et al, 2008; Zhu et al, 2011; Sasabe and Kido, 2013; Zheng et al, 2013; Xu et al, 2017a; Xu et al, 2019; Wang et al, 2020; Xu et al, 2021). Blue MR-TADF materials with high color purity are rarely applied in s-OLED.

Results

Conclusion