Power-efficient solution-processed red organic light-emitting diodes based on an exciplex host and a novel phosphorescent iridium complex

Xuejing Liu, Bing Yao, Zilong Zhang, Xiaofei Zhao, Baohua Zhang, Wai Yeung Wong, Yanxiang Cheng, Zhiyuan Xie

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69 Citations (Scopus)


High power-efficiency solution-processed red phosphorescent organic light-emitting diodes (s-PhOLEDs) are urgently needed in OLED displays and lighting applications. Herein, we have synthesized a novel solution-processable red heteroleptic iridium complex bis[2-di(p-methoxyphenyl) amino (9,9-diethylfluoren-2-yl)-5-(trifluoromethyl) pyridine][acetylacetonate] iridium(iii), i.e. Ir(DPA-Flpy-CF3)2acac, which shows efficient red photoluminescence with an emission peak located at 602 nm. This novel red phosphor possesses a high absorption coefficient in the long wavelength region, ensuring the efficient energy transfer from the interfacial exciplex host to the phosphor guest at low phosphor-doping concentration. The optimized red s-PhOLED based on the red Ir(DPA-Flpy-CF3)2acac shows a maximum external quantum efficiency of 19.3% and a power efficiency of 44.5 lm W-1with Commission International de L'Eclairage (CIE) coordinates of (0.64, 0.36). It is so far the highest power efficiency ever reported for red s-PhOLEDs and is comparable to state-of-the-art red PhOLEDs prepared by thermal evaporation.
Original languageEnglish
Pages (from-to)5787-5794
Number of pages8
JournalJournal of Materials Chemistry C
Issue number24
Publication statusPublished - 1 Jan 2016
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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