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Related Experiment Video

Updated: Sep 18, 2025

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
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N─B─N Isomer Induced Room Temperature Phosphorescence: Expression, Mechanistic Insights, and Multi-Level

Jianhua Liu1, Junxiong Yao1,2, Ruping Mu1

  • 1College of Chemistry and Chemical Engineering; Jiangxi Province Engineering Research Center of Ecological Chemical Industry, Jiujiang University, Jiujiang, 332005, China.

Angewandte Chemie (International Ed. in English)
|June 20, 2025
PubMed
Summary

Researchers developed a novel N─B─N isomerization strategy to create pure organic room temperature phosphorescence (RTP) materials. One isomer, 1,1-DB, shows excellent RTP, while the other, 1,2-DB, does not, offering insights for designing new phosphorescent materials.

Keywords:
Anti‐counterfeiting and information encryptionColor‐tunable emissionDiborane isomerPhosphorescencePhosphorescence resonance energy transfer

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Pure organic room temperature phosphorescence (RTP) materials are crucial for optoelectronics.
  • Controlling triplet excitons in organic materials for enhanced RTP is challenging due to complex relaxation pathways.

Purpose of the Study:

  • To explore a N─B─N isomerization strategy for enhancing RTP performance in pure organic materials.
  • To synthesize and investigate the RTP properties of two isomers, 1,1-DB and 1,2-DB, based on HN─B─NH units.

Main Methods:

  • Synthesis of two isomers: 1,1-DB and 1,2-DB, containing HN─B─NH units.
  • Investigation of RTP properties of the synthesized isomers.
  • Exploration of multicolor afterglows via phosphorescence resonance energy transfer (PER).

Main Results:

  • 1,1-DB exhibited excellent RTP, while 1,2-DB showed negligible phosphorescence.
  • The N─B─N unit in 1,1-DB enhances electron delocalization and stabilizes triplet excitons, improving intersystem crossing (ISC) and spin-orbit coupling (SOC).
  • Multicolor afterglows were achieved by doping fluorescein into 1,1-DB.

Conclusions:

  • The N─B─N isomerization strategy is effective for modulating triplet excitons and enhancing RTP.
  • 1,1-DB represents a new class of efficient pure organic RTP materials.
  • This work provides valuable insights for rational design and discovery of novel boron-nitrogen molecular systems for RTP applications.