Spin-polarized carrier injection through hybrid ferromagnetic electrode for enhanced optical efficiency of organic light-emitting diodes

Ha Hwang, Deok Hyeon Yoon, Im Hyuk Shin, In Seon Yoon, Jin Ho Kwack, Ouk Jae Lee, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

Abstract

Organic light-emitting diodes (OLEDs) with an enhanced optical efficiency were fabricated using a hybrid ferromagnetic (FM) electrode that injected spin-polarized carriers (spin-polarized current). The optical efficiency of the fluorescent OLEDs was increased through the injected spin-polarized carriers, which increased the formation ratio of singlet to triplet exciton. The OLED with the hybrid FM electrode exhibited enhancements of 66.6% in the external quantum efficiency at 50 mA/cm2 and 31.8% in the power efficiency at 500 cd/m2, compared with a reference device at room temperature. The hybrid FM electrode was designed using the finite-difference time-domain method to obtain a high optical efficiency while preventing spectrum distortion.

Original languageEnglish
Article number105755
JournalOrganic Electronics
Volume84
DOIs
Publication statusPublished - 2020 Sep

Keywords

  • Ferromagnetic electrode
  • Finite-difference time-domain simulation
  • Organic light-emitting diode
  • Spin-organic light-emitting diode
  • Spin-polarized carrier injection
  • Spin-polarized current

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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