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Clustering-Triggered Efficient Room-Temperature Phosphorescence from Nonconventional Luminophores.

Shuyuan Zheng¹, Taiping Hu², Xin Bin¹

¹School of Chemistry and Chemical Engineering Shanghai Key Lab of Electrical Insulation and Thermal Aging Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, No. 800 Dongchuan Rd., Minhang District, Shanghai, 200240, China.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry

|November 20, 2019

Summary

Researchers developed a new strategy for efficient pure organic room-temperature phosphorescence (RTP) using nonconventional luminophores. This method enhances light emission by incorporating lone pairs and promoting electronic interactions, achieving high efficiency in thiourea solids.

Keywords:

aggregation-induced emission clustering-triggered emission luminescence nonconventional luminophores room-temperature phosphorescence

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Area of Science:

Materials Science
Organic Chemistry
Photophysics

Background:

Pure organic room-temperature phosphorescence (RTP) is gaining attention for novel optoelectronic applications.
Achieving efficient RTP from nonconventional luminophores is hindered by a lack of mechanistic understanding.

Purpose of the Study:

To develop a strategy for efficient RTP in nonconventional luminophores.
To elucidate the mechanism behind enhanced RTP through molecular design.

Main Methods:

Incorporation of lone pair elements into organic molecules.
Inducing molecular clustering and electronic interactions.
Experimental characterization and theoretical calculations (e.g., DFT) of urea and thiourea derivatives.

Main Results:

A strategy combining lone pairs, clustering, and electronic interactions was proposed and validated.
High RTP efficiency (up to 24.5%) was achieved in thiourea solids.
Through-space delocalization was identified as crucial for efficient emission.

Conclusions:

The proposed strategy effectively enhances RTP in nonconventional luminophores.
Understanding and controlling electronic interactions and molecular aggregation are key to efficient phosphorescence.
This work paves the way for new nonconventional phosphors and deeper mechanistic insights.