Issue 12, 2016

Light-blue thermally activated delayed fluorescent emitters realizing a high external quantum efficiency of 25% and unprecedented low drive voltages in OLEDs

Abstract

Thermally activated delayed fluorescent (TADF) emitters are one of the most promising candidates for low-cost and high efficiency organic light-emitting devices (OLEDs) to realize an internal quantum efficiency of unity. However, the power efficiency (ηp), which is inversely related to the drive voltage, is significantly lower than that of the phosphorescent counterparts, especially for blue devices. Here, we developed a series of TADF emitters, 2-functionalized-4,6-bis[4-(9,9-dimethyl-9,10-dihydroacridine)phenyl]pyrimidine called Ac-RPM. We introduced a phenylacridine moiety into the 4,6-position of the pyrimidine core to induce a twisted structure leading to a high photoluminescence quantum yield of ∼80%, and a small singlet and triplet excited energy difference of <0.20 eV. The optimized device realized an ηp of 62 lm W−1, a high external quantum efficiency of 25%, light-blue emissions with the Commission Internationale de l’Eclairage chromaticity coordinates of (0.19, 0.37) and a low turn-on voltage of <3.0 V.

Graphical abstract: Light-blue thermally activated delayed fluorescent emitters realizing a high external quantum efficiency of 25% and unprecedented low drive voltages in OLEDs

Supplementary files

Article information

Article type
Communication
Submitted
01 Dec. 2015
Accepted
11 Janv. 2016
First published
11 Janv. 2016

J. Mater. Chem. C, 2016,4, 2274-2278

Light-blue thermally activated delayed fluorescent emitters realizing a high external quantum efficiency of 25% and unprecedented low drive voltages in OLEDs

R. Komatsu, H. Sasabe, Y. Seino, K. Nakao and J. Kido, J. Mater. Chem. C, 2016, 4, 2274 DOI: 10.1039/C5TC04057D

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