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Boron-Cluster-Enhanced Ultralong Organic Phosphorescence
Deshuang Tu1, Suzhi Cai2, Charlene Fernandez1
1State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, Nanjing University, Nanjing, 210023, China.
Angewandte Chemie (International Ed. in English)
|April 26, 2019
Summary
Researchers developed novel boron-cluster-based persistent phosphors. These materials exhibit long-lived luminescence and dynamic emission properties, opening avenues for advanced phosphor applications.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Carborane-based luminescent materials have been investigated, but persistent phosphors remain unreported.
- Persistent phosphors are crucial for applications requiring long-term light emission after excitation.
Purpose of the Study:
- To synthesize and characterize novel boron-cluster-based persistent phosphors.
- To investigate the role of carboranes in promoting intersystem crossing and stabilizing triplet excitons.
- To explore the photophysical properties and potential applications of these new phosphors.
Main Methods:
- Synthesized carborane-carbazole conjugates.
- Investigated photoluminescence properties, including lifetime and quantum yield.
- Analyzed structural contributions to exciton stabilization using nonclassical hydrogen bonds (B-H⋅⋅⋅π).
Main Results:
- Achieved persistent phosphors by linking carboranyl cages to carbazole π-systems.
- Carboranes facilitated intersystem crossing and stabilized triplet excitons.
- Observed a long luminescence lifetime (0.666 s) and high quantum yield (7.1%) without heavy atoms.
- Demonstrated dynamic emission behaviors: thermochromism and mechanochromism.
Conclusions:
- Non-metal/heavy-atom boron clusters can be utilized to create high-performance, multifunctional phosphors.
- The developed phosphors exhibit outstanding properties for potential applications.
- This work establishes a new class of persistent phosphors based on boron clusters.
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