Achieving High Efficiency and Pure Blue Color in Hyperfluorescence Organic Light Emitting Diodes using Organo-Boron Based Emitters

Kenkera Rayappa Naveen, Hyuna Lee, Ramanaskanda Braveenth, Durai Karthik, Ki Joon Yang, Soon Jae Hwang, Jang Hyuk Kwon

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In the field of organic light-emitting diodes, organo-boron based thermally activated delayed fluorescence (TADF) emitters have witnessed outstanding achievements. However, it is still challenging to achieve pure blue color (CIE y < 0.20) along with high efficiencies. To overcome these hurdles, the hyperfluorescence (HF) system suggests a key strategy for future display applications. Here, two TADF host materials, pMDBA-DI and mMDBA-DI, and a pure blue multi-resonance type tert-butyl substituted TADF fluorescence emitter t-Bu-ν-DABNA are reported, for efficient HF devices. Among the synthesized TADF sensitized host materials, the mMDBA-DI HF device exhibits a high external quantum efficiency of 39.1% along with narrow emission with full width at half maximum of 19 nm (CIE y = 0.15). The high device efficiency is mainly attributed to the high molecular orientation factor, enhanced photoluminescence quantum yield, and a good TADF characteristic of t-Bu-ν-DABNA with efficient Förster energy transfer.

Original languageEnglish
Article number2110356
JournalAdvanced Functional Materials
Volume32
Issue number12
DOIs
Publication statusPublished - 16 Mar 2022

Keywords

  • DABNA
  • FRET
  • OLED
  • boron blue TADF
  • hyperfluorescence

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