Optical characteristics of refractive-index-matching diffusion layer in organic light-emitting diodes

Cheol Hwee Park, Jae Geun Kim, Sun Gyu Jung, Dong Jun Lee, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


We developed a diffusion layer with a refractive index-matching layer added to a transparent nanoscale polymer-based structure to obtain its effective scattering effects. The diffusion layer had higher haze when the refractive index-matching layer to a higher refractive index was used. This diffusion layer was applied to conventional organic light-emitting diodes (OLEDs) and micro-cavity OLEDs (MC-OLEDs) to evaluate the characteristics. When a diffusion layer was applied to conventional OLEDs, the external quantum efficiency (EQE) was 31.1% higher than that of the device without a diffusion layer due to the reduction of the substrate mode, and the viewing angle characteristic was also improved. Then, when the diffusion layer was applied to the MC-OLEDs, all devices showed similar EQE values regardless of the presence or absence of the diffusion layer, and the viewing-angle-dependent characteristics were greatly improved by the diffusion layer. Furthermore, when the diffusion layer was used with polarizer film, the black color implementation was not affected by the polarizer film, proving that it is applicable to actual OLED display products.

Original languageEnglish
Article number8690
JournalScientific reports
Issue number1
Publication statusPublished - 2019 Dec 1

Bibliographical note

Funding Information:
This research was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP1) (No. 2016R1A2B4014073), the Ministry of Education (No. NRF-2017R1D1A1B03036520), the Brain Korea 21 Plus Project in 2019, 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] and supported by Samsung Display Co., Ltd.

Publisher Copyright:
© 2019, The Author(s).

ASJC Scopus subject areas

  • General


Dive into the research topics of 'Optical characteristics of refractive-index-matching diffusion layer in organic light-emitting diodes'. Together they form a unique fingerprint.

Cite this