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December 12, 2025Chemistry - An Asian Journal

Modulating the Singlet–Triplet Energy Gap With Regio‐Specific Substitution on Dibenzo a,c phenazine to Realize Red TADF and Their OLEDs

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Authors

KBKomal Vasant BarhateSNSmruti Ranjan NayakMAMohammad Amir Ahemad

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Overview

Research shows increased electronic properties and room temperature phosphorescence in red TADF emitters, suggesting enhanced OLED performance.

Key Points

  • The aim is to enhance the emission properties of red TADF emitters through regio-specific substitution.
  • Designed donor-acceptor emitters using dibenzo[a,c]phenazine as the acceptor core and twisted dibenzo[b,f]azepine as the donor.
  • Studied electronic properties and the singlet-triplet energy gap of different emitters.
  • Evaluated OLED performance with the synthesized compounds.
  • 2-Az-DBP and 2,7-Az-DBP exhibited significantly low singlet-triplet energy gap values leading to orange and red TADF respectively.
  • The OLED using 2-Az-DBP showed a luminance of 6 × 10^3 Cd/m² at a current density of 50 mA/cm² with an EQE max of about 12.3%.
  • Both compounds displayed room temperature phosphorescence with millisecond lifetimes.

Cite This Study

Barhate et al. (2025) studied this question.

synapsesocial.com/papers/694019222d562116f28f6972https://doi.org/10.1002/asia.70485
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