Effects of polystyrene on morphology and electrical performance of solution-processed thermally activated delayed fluorescent organic light-emitting diodes

Jonghyun Choi, Seungwon Lee, Mamatimin Abbas, Laurence Vignau, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A polymer was added to the emissive-layer (EML) solution of thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs) to enhance their electrical and optical performances. A blue 4CzFCN TADF emitter and m-CBP host were used with 15 wt% dopant, and 1 wt% polystyrene (PS) was added to this EML solution. The PS enhanced the surface morphology, electroluminescence (EL), and external quantum efficiency (EQE). Energy transfer between the host and the dopant material was verified by analyzing the photoluminescence and time-resolved photoluminescence. After PS treatment, the surface roughness was reduced, according to the root-mean-square value obtained using atomic force microscopy. Finally, we fabricated solution-processed TADF-based OLEDs with an EQE of 4.7% at 7.7 V and a maximum luminance of 3700 cd/m2 at 10 V.

Original languageEnglish
Pages (from-to)25-29
Number of pages5
JournalCurrent Applied Physics
Volume45
DOIs
Publication statusPublished - 2023 Jan

Keywords

  • Organic light-emitting diodes (OLEDs)
  • Polymer blend
  • Polystyrene
  • Surface morphology
  • TADF OLEDs
  • Thermally activated delayed fluorescence (TADF)

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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