Nano-arrayed OLEDs: enhanced outcoupling efficiency and suppressed efficiency roll-off. Issue 41 (11th September 2018)

• Record Type: Journal Article
• Authors: Hwang, Ha; Shim, Yong Sub; Choi, Junhee; Lee, Dong Jun; Kim, Jae Geun; Lee, Ju Sung; Park, Young Wook; Ju, Byeong-Kwon
• Is Part Of: Nanoscale. Volume 10:Issue 41(2018)
• Page Start: 19330
• Page End: 19337
• Publication Date: 2018-09-11
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr03198c
• Languages: English
• ISSNs: 2040-3364

Abstract

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. 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 ( J 0 ) where the external quantum efficiency decreased to half of its initial value was improved by a factor of 2.5.