Non-Doped Deep Blue and Doped White Electroluminescence Devices Based on Phenanthroimidazole Derivative

Shuo Chen, Yukun Wu, Shoucheng Hu, Yi Zhao, Daining Fang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

A novel deep-blue emitter PhImPOTD based on phenathroimidazole was synthesized, which is incorporated by an electron-donating dibenzothiophene unit and electron-withdrawing phenanthroimidazole and diphenylphosphine oxide moieties. Furthermore, the weak π–π stacking and intermolecular aggregation render the photoluminescence quantum yield is as high as 0.34 in the solid state. Non-doped organic light emitting diodes (OLEDs) based on PhImPOTD emitter exhibits a low turn-on voltage of 3.6 V, a favorable efficiency of 1.13 cd A−1 and a deep blue emission with Commission Internationale de l’Eclairage (CIE) coordinates of (0.15, 0.08). The CIE is very close to the NTSC (National Television Standards Committe) blue standard (CIE: 0.14, 0.08). PhImPOTD is also utilized as blue emitter and the host for a yellow emitter (PO-01) to fabricate white organic light-emitting diodes (WOLEDs). This gives a forward-viewing maximum CE of 4.83 cd A−1 and CIE coordinates of (0.32, 0.32) at the luminance of 1000 cd m−2. Moreover, the single-carrier devices unambiguously demonstrate that typical bipolar-dominant characteristics of PhImPOTD. This work demonstrates not only that the phenanthroimidazole unit is an excellent building block to construct deep blue emission materials, but also the introduction of a diphenylphosphine oxide deprotonation substituent is an efficient tactic for harvesting deep-blue emitting devices.

Original languageEnglish
Pages (from-to)451-461
Number of pages11
JournalJournal of Fluorescence
Volume27
Issue number2
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • Bipolar
  • Doped white
  • Non-doped deep blue
  • OLEDs
  • Phenanthroimidazole derivative

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