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Issue 41, 2018
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Nano-arrayed OLEDs: enhanced outcoupling efficiency and suppressed efficiency roll-off

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Abstract

Organic light-emitting diodes (OLEDs) with an enhanced outcoupling efficiency and a suppressed efficiency roll-off were fabricated by inserting a nanosize pixel-defining layer (nPDL) that defines the OLED emission region as an array of nanoholes. The outcoupling efficiency of the nano-arrayed OLEDs was increased through the reduced surface plasmon polariton loss caused by the wavy diffraction grating at the metal–organic interface, and their efficiency roll-off was suppressed through the diffusive exciton outside the exciton-formation zone. As a result, the nano-arrayed OLEDs exhibited enhancements of 148.7% in the power efficiency and 137.0% in the external quantum efficiency at 1000 cd m−2 compared with a reference device. Furthermore, the critical current density (J0) where the external quantum efficiency decreased to half of its initial value was improved by a factor of 2.5.

Graphical abstract: Nano-arrayed OLEDs: enhanced outcoupling efficiency and suppressed efficiency roll-off

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Publication details

The article was received on 19 Apr 2018, accepted on 28 Aug 2018 and first published on 01 Sep 2018


Article type: Paper
DOI: 10.1039/C8NR03198C
Nanoscale, 2018,10, 19330-19337

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    Nano-arrayed OLEDs: enhanced outcoupling efficiency and suppressed efficiency roll-off

    H. Hwang, Y. S. Shim, J. Choi, D. J. Lee, J. G. Kim, J. S. Lee, Y. W. Park and B. Ju, Nanoscale, 2018, 10, 19330
    DOI: 10.1039/C8NR03198C

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