Issue 8, 2023

Highly efficient (EQE > 27%) Yellow OLEDs using spiro[fluorene-9,9′-phenanthren-10′-one]-carbazole-based donor–acceptor–donor host materials

Abstract

Four bipolar host materials, with spiro[fluorene-9,9′-phenanthrene-10′-one] acceptors with nitrile fragments and ortho, para-phenyl carbazole, and triphenylamine as donor fragments, namely MS-CN, MS-OC, MS-PC, and MS-TPA, respectively, were designed, synthesized, and their photophysical and electrochemical studies were investigated. All MS-host materials exhibited adequate energy gaps, making them suitable candidates for use as host materials for green, yellow, and red phosphorescent organic light-emitting diodes (OLEDs). We have also designed a series of OLED devices with three different emitting layered architectures to explore their potential in electroluminescence applications. Among the devices using MS-OC, the CN-T2T-blended cohost achieved the highest efficiency among the tested yellow-emitting OLEDs, having a luminance efficiency of 80.0 cd A−1, power efficiency of 113.0 lm W−1, low turn-on voltage of 2.1 V, high maximum luminance of 142464 cd m−2, and peak EQE of 27.1%. The maximum efficiency of the device is one of the highest values reported in the literature for PO-01-based devices, demonstrating the high potential of our molecular design for host materials.

Graphical abstract: Highly efficient (EQE > 27%) Yellow OLEDs using spiro[fluorene-9,9′-phenanthren-10′-one]-carbazole-based donor–acceptor–donor host materials

Supplementary files

Article information

Article type
Paper
Submitted
12 Dez 2022
Accepted
31 Jan 2023
First published
15 Feb 2023

J. Mater. Chem. C, 2023,11, 3101-3111

Highly efficient (EQE > 27%) Yellow OLEDs using spiro[fluorene-9,9′-phenanthren-10′-one]-carbazole-based donor–acceptor–donor host materials

Y. H. Lin, W. Lin, Y. Huang, C. Wu, P. Gnanasekaran, Y. Chang, S. Teng, C. Lu, C. Chang and Y. J. Chang, J. Mater. Chem. C, 2023, 11, 3101 DOI: 10.1039/D2TC05296B

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