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Highly Efficient Blue Fluorescent OLEDs Based on Upper Level Triplet-Singlet Intersystem Crossing.

Yuwei Xu1, Xiaoming Liang1, Xuehong Zhou1

  • 1Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

This study introduces a novel "hot exciton" fluorescent material that converts triplet excitons to singlet excitons, achieving over 10% external quantum efficiency in organic light-emitting devices with minimal efficiency roll-off.

Keywords:
RISC from the high-lying triplet statefluorescent OLEDshot excitonmaximum EQE of 10.5%pure blue emission

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Area of Science:

  • Organic electronics
  • Materials science
  • Photophysics

Background:

  • Organic electroluminescent materials like TADF and TTA harness triplet excitons from T1 for high efficiency.
  • Exploiting triplet excitons is key for efficient organic light-emitting devices (OLEDs).

Purpose of the Study:

  • Report a fluorescent material utilizing a "hot exciton" path for efficient light emission.
  • Investigate the conversion of triplet excitons from a high-lying T2 state to singlet excitons.
  • Explore the potential for stable, high-efficiency pure-blue and deep-blue fluorescent OLEDs.

Main Methods:

  • Determined energy levels using sensitization and nanosecond transient absorption spectroscopy.
  • Investigated the high-lying reverse intersystem crossing (hRISC) process via ketone sensitization.
  • Fabricated and tested nondoped OLED devices to evaluate performance.

Main Results:

  • Confirmed a "hot exciton" path enabling triplet-triplet conversion from the T2 state.
  • Demonstrated a small S1-T2 energy splitting and large T2-T1 gap, favoring hRISC.
  • Achieved a maximum external quantum efficiency exceeding 10% with low roll-off in nondoped OLEDs.
  • Obtained CIE coordinates of (0.15, 0.13) for the emitted light.

Conclusions:

  • The "hot exciton" pathway offers a promising strategy for developing efficient and stable fluorescent emitters.
  • This approach is particularly relevant for achieving high performance in pure-blue and deep-blue fluorescent OLEDs.
  • The reported material demonstrates the viability of exploiting high-lying triplet states for enhanced electroluminescence.