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New boron/nitrogen-B-N-B molecules offer improved organic light-emitting diode (OLED) performance. These novel emitters provide narrow bandwidths and high efficiency, overcoming previous synthesis and performance challenges in thermally activated delayed fluorescence (TADF) materials.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Boron/nitrogen (B/N)-doped multi-resonance (MR) thermally activated delayed fluorescence (TADF) molecules are key narrowband emitters for organic light-emitting diodes (OLEDs).
  • Existing B/N-doped TADF emitters suffer from synthetic difficulties, spectral broadening due to aggregation, and inefficient reverse intersystem crossing (RISC).

Purpose of the Study:

  • To develop novel B/N-doped MR-TADF molecules with enhanced optoelectronic properties and simplified synthesis.
  • To address the limitations of aggregation-induced spectral broadening and inefficient RISC in current TADF emitters.

Main Methods:

  • Integration of a B-N-B covalent bond into an MR framework, combining para-positioned B/N narrowband emission with a helically distorted B-N-B structure.
  • Lithium-free, stepwise nitrogen-directed borylation for efficient synthesis of targeted emitters.
  • Fabrication and characterization of OLED devices using the novel TADF emitters.

Main Results:

  • Achieved high synthesis yields (>80%) for targeted B-N-B integrated MR-TADF emitters.
  • Obtained deep-blue (452 nm) and greenish (495 nm) TADF emissions with narrow full-width-at-half-maximum (FWHM) of 12-14 nm.
  • Demonstrated near-unity photoluminescence quantum yields (PLQYs) and accelerated RISC rates (>10^5 s^-1).
  • OLEDs exhibited high external quantum efficiencies (EQEs) of 37.9-38.3% and narrow electroluminescence bandwidths (15-17 nm) with good operational stability.

Conclusions:

  • The B-N-B integrated MR-TADF system offers a versatile platform for high-performance organic optoelectronics.
  • This molecular design overcomes key challenges in B/N-doped TADF emitters, paving the way for advanced OLED applications.
  • The developed emitters show significant potential for next-generation displays and lighting due to their efficiency, color purity, and stability.