| Project/Area Number |
22K20536
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
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| Research Institution | Kyushu University |
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Principal Investigator |
TANG XUN 九州大学, 工学研究院, 学術研究員 (70961754)
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| Project Period (FY) |
2022-08-31 – 2024-03-31
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| Project Status |
Granted (Fiscal Year 2022)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | Organic lasers / D/A interactions / Near-infrared / organic lasers / near-infrared (NIR) |
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| Outline of Research at the Start |
Near-infrared (NIR) lasers own tremendous value in communication and surgery. Our research is aimed at manipulating interactions between the electon donating and accepting moieties in molecules, to reduce the NIR laser thresholds, and further extend the lasing wavelength beyond 900 nm.
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| Outline of Annual Research Achievements |
Donor (D) and acceptor (A) interactions have been evidenced as an effective strategy to redshift emission, but are commonly not preferred for lasing. The purpose of our work is to clarify and manipulate the D-A interactions for realizing high performance near-infrared (NIR) organic lasers. In this year, we built up a strong D-spacer-A molecular skeleton,several molecules have been designed by substituting D/A fragments, and inserting various functional spacers. For triphenylamine (TPA)/benzo[1,2-c:4,5c’]bis[1,2,5]thiadiazole (BBTD) based structure, we have theoretically predicted the photophysical properties by density functional theory calculation and synthesized the promising molecules. The photophysical properties and lasing performance have been initially evaluated, two D-A-D type molecules with different donor moieties exhibited NIR emission in toluene, the corresponding wavelength peaks were around 790 nm. These two molecules showed good photoluminescence quantum yields (PLQYs) in blend solid-state films, relatively fast radiative rates, and promising amplified spontaneous emission (ASE)/lasing performance. Up to now, one Perspective paper, which includes the organic lasing dyes from ultraviolet to NIR, insights of triplet manipulation in organic lasing, and advanced optical resonators, has been accepted. Also, one oral prsentation in JSAP spring 2023 conference has been finished.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
In the past year, to extend the lasing emission wavelength, the electron-accepting benzothiadiazole (BTD), benzo[1,2-c:4,5c’]bis[1,2,5]thiadiazole (BBTD), and curcuminoid were used as strong acceptors, strong electron-donating triphenylamine (TPA), 9-phenylcarbazole, methoxy, and isopropyl group was selected as the donor moieties. Meanwhile, D/A interactions were manipulated by different spacers, including the phenyl and fluorene groups. Therefore, we have designed the potential molecular structures and theoretically calculated them, we have successfully synthesized some of them, and initially measured their photophysical properties, ASE and lasing performance.
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| Strategy for Future Research Activity |
For the future work, the systematic photophysical properties and the deep dynamic exciton behaviours of singlets and triplets in strong D-A lasing molecules will be conuducted to clarify the lasing process.
Amplified spontaneous emission (ASE) in different lasing molecules will be measured to evaluate the potential lasing performance. Advanced distributed feedback (DFB) resonators will be designed the fabricated to realize the lasing output.
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