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Issue 12, 2016
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Light-blue thermally activated delayed fluorescent emitters realizing a high external quantum efficiency of 25% and unprecedented low drive voltages in OLEDs

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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

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Publication details

The article was received on 01 Dec 2015, accepted on 11 Jan 2016 and first published on 11 Jan 2016


Article type: Communication
DOI: 10.1039/C5TC04057D
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. C, 2016,4, 2274-2278
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    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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