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Updated: Mar 6, 2026

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Novel Bipolar Indole-Based Solution-Processed Host Material for Efficient Green and Red Phosphorescent OLEDs.

Yi Chen1, Xiang Wei2, Jin Cao2

  • 1Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, China.

ACS Applied Materials & Interfaces
|March 7, 2017
PubMed
Summary

A novel bipolar host material, INDY, was synthesized for solution-processed PHOLEDs, achieving high efficiencies and excellent color stability in green and red devices.

Keywords:
bipolar host materialhigh thermal stabilityhighly efficientindole derivativesphosphorescent OLEDs

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photonic Devices

Background:

  • Development of efficient host materials is crucial for advancing solution-processed phosphorescent organic light-emitting diodes (PHOLEDs).
  • Achieving balanced charge transport and high triplet energy levels are key challenges in designing host materials for high-performance PHOLEDs.

Purpose of the Study:

  • To design and synthesize a new bipolar host material, INDY, for solution-processed PHOLEDs.
  • To investigate the charge transport properties, thermal stability, and device performance of the synthesized material.

Main Methods:

  • Synthesis of the bipolar host material INDY, incorporating hole-transporting indole-dibenzofuran and electron-transporting benzimidazole units via a biphenyl bridge.
  • Fabrication and characterization of solution-processed green and red PHOLEDs using the INDY material.
  • Evaluation of device efficiencies (current efficiency, power efficiency, external quantum efficiency), thermal properties (glass transition temperature), and color stability.

Main Results:

  • The synthesized INDY material exhibits balanced bipolar charge transfer and a high triplet energy level (>2.6 eV).
  • INDY demonstrates good thermal and morphological stability with a high glass transition temperature (148 °C).
  • Solution-processed green PHOLEDs achieved efficiencies of 27.33 cd/A and 12.26 lm/W. Red PHOLEDs reached maximum efficiencies of 17.20 cd/A, 9.82 lm/W, and 12.61% with excellent color stability.

Conclusions:

  • The novel bipolar host material INDY is suitable for high-performance solution-processed PHOLEDs.
  • The orthogonal connection of charge-transporting units and the twisted molecular conformation contribute to excellent device performance and stability.