Issue 47, 2021

Efficient blue thermally activated delayed fluorescent emitters based on a boranaphtho[3,2,1-de]anthracene acceptor

Abstract

A series of blue thermally activated delayed fluorescence (TADF) emitters have been developed by the combination of boranaphtho[3,2,1-de]anthracene (BO) acceptor (A) and sprio-acridine-fluorene donors (D). Different phenyl substitutions are induced for the comprehension of structure–property relationship. Systematic characterization of thermal, photophysical, electrochemical and electroluminescent (EL) properties have been carried out in detail. The photophysical analysis suggests that these D–A type emitters possess decent TADF properties with high photoluminescence quantum yield of up to 99%. A high reverse inter-system crossing constant (kRISC) of 1.52 × 106 s−1 is achieved by emitter MH without phenyl decoration. Benefitting from their high PLQYs as blue emitters, the doped organic light-emitting diodes (OLEDs) based on these compounds achieve attractive EL performances. The blue-emitting OLEDs with CIE (0.141. 0.215) based on MH exhibits a maximum external quantum efficiency (EQEmax) of 23.9%, current efficiency (CEmax) of 42.9 cd A−1 and power efficiency (PEmax) of 42.1 lm W−1. As the number of the phenyl group increases, the value of EQEmax shows a slight decrease to 20.3% of MP and 19.3% of PP accompanied with a drop of y of CIE coordinates to 0.197 and 0.188, respectively.

Graphical abstract: Efficient blue thermally activated delayed fluorescent emitters based on a boranaphtho[3,2,1-de]anthracene acceptor

Supplementary files

Article information

Article type
Paper
Submitted
01 Okt. 2021
Accepted
09 Nov. 2021
First published
24 Nov. 2021

J. Mater. Chem. C, 2021,9, 17136-17142

Efficient blue thermally activated delayed fluorescent emitters based on a boranaphtho[3,2,1-de]anthracene acceptor

R. Pei, H. Liu, C. Zhou, J. Miao and C. Yang, J. Mater. Chem. C, 2021, 9, 17136 DOI: 10.1039/D1TC04699C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements