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 journalArticlepeer-review

15 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

Bibliographical note

Funding Information:
This work was supported by the Industry Technology R&D program of MOTIE/KEIT [10048317, Development of red and blue OLEDs with external quantum efficiency over 20% using delayed fluorescent materials], the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (No. 2016R1A2B4014073), Basic Science Research Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. NRF-2017R1D1A1B03036520), and the KIAT (Korea Institute for Advancement of Technology) grant funded by the Korea Government (MOTIE: Ministry of Trade Industry and Energy). (No. P0001018, HRD program for Highly educated human resources development project on cutting-edge sensor technology for sensor industry acceleration).

Publisher Copyright:
© 2018 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Materials Science

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