Solution-processed white organic light-emitting diodes with blue fluorescent and orange-red thermally activated delayed fluorescent dendritic luminogens

Jiwon Yoon, Suna Choi, Cheol Hun Jeong, Seong Keun Kim, Hyuna Lee, Youngseo Kim, Jang Hyuk Kwon, Sungnam Park, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this work, dendritic luminogens, namely, 3ICz-Tr as a blue emitter and Tri-tNID as an orange-red emitter, were synthesized and used for the application of white organic light-emitting diodes (WOLEDs). These molecules have appropriately high molecular weights, which are favorable for the fabrication of thin films with fine surface morphologies. Interestingly, the blue emitting 3ICz-Tr displays fluorescent character and the orange-red emitting Tri-tNID exhibited thermally activated delayed fluorescence, which was confirmed by steady state and transient photoluminescence (TRPL) spectroscopy. Eventually, WOLED devices could be realized by mixing the two molecules and optimizing their mixture composition. Among the devices we fabricated, the device with Tri-tNID and 3ICz-Tr (0.5:99.5 wt ratio) without additional host material demonstrated nearly pure white emission, with the maximum EQE of 8.32% and CIE coordinate of (0.32, 0.30). Furthermore, by changing the composition of the two dendritic molecules, the emission color can be adjusted from a warm white to a cool white in the corresponding WOLED.

Original languageEnglish
Article number107650
JournalDyes and Pigments
Volume170
DOIs
Publication statusPublished - 2019 Nov 1

Keywords

  • Blend film
  • Dendritic molecule
  • Solution-process
  • White organic light-emitting diodes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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