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Customizing circularly polarized afterglow by stepwise chiral amplification in BINAPs/BINAPOs
Bo Yang1, Suqiong Yan1, Shirong Ban1
1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University Nanjing 210023 P. R. China whuang@nju.edu.cn.
Chemical Science
|May 1, 2025
Summary
Researchers developed chiral phosphors that overcome spin-forbidden radiation, achieving ultra-long room temperature phosphorescence with extended lifetimes and improved dissymmetry factors for advanced optical applications.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Chiral phosphors capable of circularly polarized ultra-long room-temperature phosphorescence (CP-OURTP) are highly sought after.
- Challenges include short lifetimes and low dissymmetry factors due to spin-forbidden transitions and inefficient intersystem crossing (ISC).
Purpose of the Study:
- To design and synthesize novel chiral emitters that overcome limitations in CP-OURTP.
- To achieve enhanced phosphorescence lifetimes, quantum efficiencies, and dissymmetry factors.
- To explore supramolecular chiral amplification for CP-OURTP applications.
Main Methods:
- Synthesis of donor-decorated BINAPs/BINAPOs with tunable D-A character.
- Incorporation of emitters into polymer matrices to form phosphorescent polymers.
- Utilizing in situ chiral liquid crystal polymerization for secondary helical assembly.
- Characterization of photophysical properties including lifetime, quantum efficiency, and circular dichroism.
Main Results:
- Developed emitters exhibit hybridized local and charge-transfer (HLCT) characteristics, enabling efficient ISC and triplet population.
- Doped polymers show high quantum efficiency, impressive CP-OURTP lifetimes (up to 1.02 s), and dissymmetry factors in the 10^-3 level.
- Amplified CP-OURTP with a dissymmetry factor of ±0.11 and a lifetime of 0.83 s was achieved via chiral liquid crystal polymerization.
Conclusions:
- The developed chiral emitters and polymerization strategies effectively overcome spin-forbidden radiation barriers in CP-OURTP.
- The materials demonstrate significant potential for applications in optical encryption and advanced luminescent devices.
- Structural dependence and supramolecular assembly are key factors for enhancing CP-OURTP performance.
