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

2 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

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Organic light emitting diodes (OLED)
Quantum efficiency
Excitons
Diffraction gratings
Pixels
Metals
LDS 751

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Hwang, H., Shim, Y. S., Choi, J., Lee, D. J., Kim, J. G., Lee, J. S., ... 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

Nano-arrayed OLEDs : Enhanced outcoupling efficiency and suppressed efficiency roll-off. / Hwang, Ha; Shim, Yong Sub; Choi, Junhee; Lee, Dong Jun; Kim, Jae Geun; Lee, Ju Sung; Park, Young Wook; Ju, Byeong Kwon.

In: Nanoscale, Vol. 10, No. 41, 07.11.2018, p. 19330-19337.

Research output: Contribution to journalArticle

Hwang, H, Shim, YS, Choi, J, Lee, DJ, Kim, JG, Lee, JS, Park, YW & Ju, BK 2018, 'Nano-arrayed OLEDs: Enhanced outcoupling efficiency and suppressed efficiency roll-off', Nanoscale, vol. 10, no. 41, pp. 19330-19337. https://doi.org/10.1039/c8nr03198c
Hwang H, Shim YS, Choi J, Lee DJ, Kim JG, Lee JS et al. Nano-arrayed OLEDs: Enhanced outcoupling efficiency and suppressed efficiency roll-off. Nanoscale. 2018 Nov 7;10(41):19330-19337. https://doi.org/10.1039/c8nr03198c
Hwang, Ha ; Shim, Yong Sub ; Choi, Junhee ; Lee, Dong Jun ; Kim, Jae Geun ; Lee, Ju Sung ; Park, Young Wook ; Ju, Byeong Kwon. / Nano-arrayed OLEDs : Enhanced outcoupling efficiency and suppressed efficiency roll-off. In: Nanoscale. 2018 ; Vol. 10, No. 41. pp. 19330-19337.
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