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Efficient Visible-Light-Activated Ultra-Long Room-Temperature Phosphorescence Triggered by Multi-Esterification.

Jiahong Yu1, Zhiyu Sun1, Huili Ma2

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Researchers developed a new method for ultra-long room-temperature phosphorescence (UL-RTP) using visible light. This breakthrough enables brighter, longer-lasting afterglow in amorphous organic materials for advanced applications.

Keywords:
Amorphous Phosphorescent FilmEncryptionOrganic Room-Temperature PhosphorescenceUltra-Long LifetimesVisible-Light Excitation

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Ultra-long room-temperature phosphorescence (UL-RTP) is crucial for flexible displays, anti-counterfeiting, and bio-imaging.
  • Achieving efficient UL-RTP in amorphous materials, especially with visible light activation and bright afterglow, is challenging due to aggregation-induced quenching.

Purpose of the Study:

  • To develop a general molecular design strategy for efficient visible-light-excited UL-RTP in amorphous organic materials.
  • To overcome limitations of current UL-RTP materials, enabling broader technological applications.

Main Methods:

  • A rational molecular design strategy involving multi-esterification of a rigid, large-plane phosphorescence core.
  • Synthesizing and characterizing multi-esterified coronene derivatives.

Main Results:

  • Multi-esterification enabled visible-light-excited UL-RTP by enhancing excitation, facilitating intersystem crossing, boosting triplet exciton decay, and reducing nonradiative decay.
  • Achieved highly efficient and stable UL-RTP (2.01 s lifetime, 35.4% efficiency at 450 nm) in flexible films using multi-esterified coronene.
  • Demonstrated potential applications in white light-emitting diodes and information technology via flashlight-activated afterglow encryption.

Conclusions:

  • The multi-esterification strategy provides a versatile approach to achieving efficient visible-light-stimulated UL-RTP in amorphous materials.
  • This work paves the way for advanced optoelectronic devices and security features leveraging bright, long-lasting organic phosphorescence.