Issue 43, 2021

High performance non-doped green organic light emitting diodes via delayed fluorescence

Abstract

Non-doped, delayed fluorescence organic light-emitting diodes (OLEDs) provide a route to high performance devices and simplified device fabrication. Here, two ambipolar anthracene derivatives containing a hole-transporting di-p-tolylamine and a carbazole and an electron-transporting phosphine oxide moiety are rationally designed and synthesized. The thermal and optoelectronic properties were investigated and the neat films of these compounds show high photoluminescence quantum yields of 84–87%. Non-doped OLEDs with these luminogens exhibit green emission at ∼545 nm and an EQEmax of over 7.2% due to the delayed fluorescence resulting from triplet–triplet annihilation (TTA). The devices show a high luminance of over 104 400 cd m−2. Power efficiency and current efficiency maxima are up to 23.0 lm W−1 and 28.3 cd A−1, respectively. Moreover, the devices show very low efficiency roll-off and retain 90% of the maximum efficiency even at 20 000 cd m−2. When combined with a thermally activated delayed fluorescent (TADF) assistant dopant, the green-emitting OLEDs show a high EQEmax of 17.8%.

Graphical abstract: High performance non-doped green organic light emitting diodes via delayed fluorescence

Supplementary files

Article information

Article type
Paper
Submitted
15 août 2021
Accepted
13 oct. 2021
First published
14 oct. 2021

J. Mater. Chem. C, 2021,9, 15583-15590

High performance non-doped green organic light emitting diodes via delayed fluorescence

B. Sk, V. Thangaraji, N. Yadav, G. P. Nanda, S. Das, P. Gandeepan, E. Zysman-Colman and P. Rajamalli, J. Mater. Chem. C, 2021, 9, 15583 DOI: 10.1039/D1TC03849D

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