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Updated: Apr 10, 2026

Development of Efficient OLEDs from Solution Deposition
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Red OLED with efficiency of 25.6% at 10,000 cd m-2 based on selenium embedding multiple resonance framework.

Yexuan Pu1, Xinliang Cai1, Chenglong Li1

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.

Light, Science & Applications
|April 8, 2026
PubMed
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Researchers developed a novel selenium-embedded red emitter for organic light-emitting diodes (OLEDs). This material significantly reduces efficiency roll-off in red OLEDs by enabling faster reverse intersystem crossing (RISC), paving the way for better displays.

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Multiple resonance thermally activated delayed fluorescence (MR-TADF) materials offer narrowband emission and high efficiency, crucial for advanced displays.
  • Red MR-TADF organic light-emitting diodes (OLEDs) face significant efficiency roll-off due to slow reverse intersystem crossing (RISC).

Purpose of the Study:

  • To develop efficient red MR-TADF emitters that overcome the efficiency roll-off limitation.
  • To investigate a novel selenium-embedded framework for enhanced RISC rates and performance in OLEDs.

Main Methods:

  • Synthesis and characterization of a novel selenium-embedded red MR emitter (tFSeBN).
  • Fabrication and testing of OLED devices utilizing the tFSeBN emitter.
  • Evaluation of device performance, including external quantum efficiency (EQE) and efficiency roll-off at various luminance levels.

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  • Assessment of tFSeBN as a sensitizer in hyperfluorescent OLEDs.

    • Main Results:

    • The tFSeBN emitter exhibits red emission at 607 nm with a record-high RISC rate of 7.5 × 10^5 s^-1.
    • The corresponding OLED achieved a maximum EQE of 34.7% and maintained high EQE values (31.0% at 1000 cd/m^2, 25.6% at 10,000 cd/m^2), demonstrating ultra-low efficiency roll-off.
    • As a sensitizer, tFSeBN enabled pure-red emission (CIE: (0.70, 0.30)) with high EQE and suppressed roll-off in hyperfluorescent OLEDs.

    Conclusions:

    • The selenium-embedded MR framework effectively accelerates RISC, addressing the critical efficiency roll-off issue in red OLEDs.
    • tFSeBN serves as both a high-performance emitter and an efficient sensitizer, offering a viable alternative to noble-metal-sensitized systems.
    • This approach provides a promising pathway for developing next-generation red OLEDs for ultra-high-definition displays.