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Issue 11, 2012
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Solution-processable small molecules as efficient universal bipolar host for blue, green and red phosphorescent inverted OLEDs

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Abstract

Inverted organic light-emitting diodes (IOLEDs) with a bottom cathode are of great interest for large-size active-matrix displays due to their easy integration with n-type thin film transistors (TFTs) based on low-cost and highly-uniform amorphous silicon and oxide. In this work, a solution-processable electron transporting material 2,7-bis(diphenylphosphoryl)-9,9′-spirobi[fluorene] (SPPO13) is employed to blend with a solution-processable hole transporting material 4,4′,4′′-tri(9-carbazoyl)triphenylamine (TCTA) to be used as a universal bipolar co-host for blue, green and red phosphors, and for the first time, phosphorescent IOLEDs are fabricated by solution-processing small molecules. High efficiency and reduced efficiency roll-off are achieved in the solution-processed IOLEDs, which mainly contribute to the high quality of the solution-processed small molecule films as well as the balanced charge injection in the co-host system. Importantly, the solution process is advantageous over vacuum evaporation to deposit multi-component small molecule films, and can be expected to reduce manufacturing costs. Our results demonstrate a promising approach to fabricate low-cost and high-performance IOLEDs for n-type TFT-based displays.

Graphical abstract: Solution-processable small molecules as efficient universal bipolar host for blue, green and red phosphorescent inverted OLEDs

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Publication details

The article was received on 09 Dec 2011, accepted on 06 Jan 2012 and first published on 03 Feb 2012


Article type: Paper
DOI: 10.1039/C2JM16463A
Citation: J. Mater. Chem., 2012,22, 5164-5170
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    Solution-processable small molecules as efficient universal bipolar host for blue, green and red phosphorescent inverted OLEDs

    J. Chen, C. Shi, Q. Fu, F. Zhao, Y. Hu, Y. Feng and D. Ma, J. Mater. Chem., 2012, 22, 5164
    DOI: 10.1039/C2JM16463A

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