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Hybridized Local and Charge-Transfer Emitter With a Dual-Hindered Indoline Donor for Fast and Efficient Red Plastic
Qiqi Xu1, Hongying He1, Yiyan Guan2
1State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Shanghai Key Laboratory of Functional Materials Chemistry, Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, Frontiers Science Center For Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China.
Researchers developed a novel red organic scintillator for improved radiation detection. This fast and efficient material offers enhanced light yield and rapid response, paving the way for advanced medical imaging and non-destructive testing applications.
Area of Science:
- Materials Science
- Organic Electronics
- Radiation Detection
Background:
- Organic scintillators convert ionizing radiation to light, crucial for imaging.
- Current limitations include poor radiation absorption, low exciton utilization, and slow response times.
- Compatibility with silicon photomultipliers (SiPM) is key for practical applications.
Purpose of the Study:
- To develop a fast and efficient red organic scintillator with improved performance.
- To address limitations of existing organic scintillators for medical imaging and non-destructive testing.
- To create a material compatible with SiPM technology.
Main Methods:
- Synthesized a novel hybridized local and charge-transfer (HLCT) emitter with an ultra-strong dual-hindered indoline donor.
- Incorporated a chair-shaped indoline donor for red-shifted radioluminescence and aggregation-induced emission.
- Introduced bulky tert-butyl groups to suppress non-radiative decay and accelerate reverse intersystem crossing.
Main Results:
- Achieved an ultrafast decay lifetime of 3.94 ns, among the fastest for red scintillators.
- Demonstrated a high light yield of 24231 photons MeV⁻¹ (1.8x benchmark BC-430).
- Reported an ultralow detection limit of 168 nGy s⁻¹ and resolution of 16.8 lp mm⁻¹.
Conclusions:
- The developed cID-Bt scintillator shows efficient triplet exciton harvesting and superior performance.
- Plastic scintillators and fibers based on cID-Bt show promise for radiation detection and X-ray imaging.
- This work establishes a viable strategy for next-generation organic red/NIR scintillators.
