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

Ha Hwang, Yong Sub Shim, Junhee Choi, Dong Jun Lee, Jae Geun Kim, Ju Sung Lee, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)19330-19337
Number of pages8
JournalNanoscale
Volume10
Issue number41
DOIs
Publication statusPublished - 2018 Nov 7

ASJC Scopus subject areas

  • Materials Science(all)

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    Hwang, H., Shim, Y. S., Choi, J., Lee, D. J., Kim, J. G., Lee, J. S., Park, Y. W., & Ju, B. K. (2018). Nano-arrayed OLEDs: Enhanced outcoupling efficiency and suppressed efficiency roll-off. Nanoscale, 10(41), 19330-19337. https://doi.org/10.1039/c8nr03198c