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Self-Stabilized Amorphous Organic Materials with Room-Temperature Phosphorescence.

Wei Xu1,2, Yaguo Yu1,2, Xiaonan Ji1,2

  • 1State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Changning Road 865, Shanghai, 200050, China.

Angewandte Chemie (International Ed. in English)
|August 17, 2019
PubMed
Summary

Researchers developed self-stabilized organic room-temperature phosphorescent (RTP) materials using a novel ionization strategy. This breakthrough enhances RTP material stability and enables applications like peroxide vapor detection.

Keywords:
amorphous stabilitymolecular recognitionphoto-induced charge separationroom-temperature phosphorescencesupramolecular chemistry

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Area of Science:

  • Organic electronics
  • Photophysics
  • Materials science

Background:

  • Organic room-temperature phosphorescent (RTP) materials face stability challenges in air.
  • Existing methods often require crystallization or encapsulation to improve stability.

Purpose of the Study:

  • To develop a new strategy for creating self-stabilized organic RTP materials without crystallization or encapsulation.
  • To investigate the potential of these materials for applications such as vapor detection.

Main Methods:

  • A photo-induced charge separation system was employed to achieve complete ionization.
  • The aromatic phenol 4-carbazolyl salicylaldehyde (CSA) was ionized to form a stable H-bonding anion-cation radical structure.
  • A completely amorphous CSA-I film was obtained.

Main Results:

  • The amorphous CSA-I film exhibited remarkable stability in air.
  • Phosphorescent lifetimes of 0.14 s were achieved at room temperature with direct air exposure.
  • A significant 21.5-fold increase in emission intensity was observed.
  • The material demonstrated successful utilization for peroxide vapor detection.

Conclusions:

  • The novel ionization strategy successfully created self-stabilized amorphous organic RTP materials.
  • This approach reconciles the trade-off between phosphorescence stability and vapor permeability.
  • The developed material shows promise for sensitive and stable vapor sensing applications.