Full-Color Sterically Shielded Boron Difluoride Emitters with Efficient and Ultrapure Electroluminescence via Sensitized Fluorescence

Tianyu Huang; Qi Wang; Renyin Zhou; Haowen Chen; Wei Jiang; Jinbei Wei; Guoyun Meng; Guomeng Li; Xuewen Wang; Lian Duan; Dongdong Zhang

doi:10.1021/acsami.3c02628

Full-Color Sterically Shielded Boron Difluoride Emitters with Efficient and Ultrapure Electroluminescence via Sensitized Fluorescence

ACS Appl Mater Interfaces. 2023 Jun 7;15(22):27018-27025. doi: 10.1021/acsami.3c02628. Epub 2023 May 26.

Authors

Tianyu Huang¹, Qi Wang¹, Renyin Zhou², Haowen Chen², Wei Jiang², Jinbei Wei³, Guoyun Meng¹, Guomeng Li¹, Xuewen Wang⁴, Lian Duan¹, Dongdong Zhang¹

Affiliations

¹ Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
² School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, Jiangsu, China.
³ State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Qianjin Avenue 2699, Changchun 130012, China.
⁴ Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan 528200, China.

PMID: 37232351
DOI: 10.1021/acsami.3c02628

Abstract

Emitters with narrowband emissions are essential to improve the color purity of organic light-emitting diodes (OLEDs). Boron difluoride (BF) derivatives have preliminarily exhibited small full width at half-maximum (FWHM) values in electroluminescent devices, which, however, still face formidable challenges in recycling triplet excitons and realizing full-color emissions covering the whole visible spectra. Here, a systematic molecular engineering on the aza-fused aromatic emitting core and peripheral substitutions is made, affording a family of full-color BF emitters spanning from blue (461 nm) to red (635 nm), with high photoluminescence quantum yields of >90% and a small FWHM of 0.12 eV. The device architectures are delicately manipulated to form effective thermally activated sensitizing emissions, first affording the highest maximum external quantum efficiency of >20% for BF-based OLEDs with negligible efficiency roll-off.

Keywords: TADF-sensitized fluorescence; boron difluoride derivatives; fluorescent organic light-emitting diodes; full-color dopants; ultrapure emission.