Microcavity characteristics analysis of micro-shuttered organic light-emitting diodes

Dong Jun Lee, Soo Jong Park, Cheol Hwee Park, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticle

Abstract

We demonstrated the control of the microcavity (MC) effect in micro-shuttered organic light-emitting diodes (OLEDs) with the introduction of an Ag striped pattern (ASP) layer between the organic layer and the indium zinc oxide layer. The ASP electrodes demonstrated high flexibility, conductivity, and transmittance. The optical and electrical properties of the OLED devices with micro-scale patterned metal electrodes with varying thicknesses and uncovered (open) area:entire glass surface area ratios (open ratios, ORs) were analyzed. The ASP OLEDs demonstrated high color purity and narrowed emission spectra because of the MC effect, increased light extraction by modulating the OR of the micro-shutter structure, and adjustability of the viewing angle distortion by controlling the OR. The ASP OLEDs exhibited maximum efficiency at the OR of 0.3 (Ag thickness; tAg = 15 nm) because of their optimum transmittance and conductivity. The viewing angle distortion decreased by approximately 60.3% with an increase in the OR from 0 to 0.7, as revealed by the changes in the color coordinates. The results showed that when deposited on flexible substrates, ASP electrodes can be used in flexible devices.

Original languageEnglish
Article number137643
JournalThin Solid Films
Volume692
DOIs
Publication statusPublished - 2019 Dec 31

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Keywords

  • Metal electrode
  • Micro-shuttered
  • Microcavity
  • Organic light-emitting diode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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