| 研究課題/領域番号 |
22K20536
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| 研究機関 | 九州大学 |
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研究代表者 |
TANG XUN 九州大学, 工学研究院, 学術研究員 (70961754)
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| 研究期間 (年度) |
2022-08-31 – 2024-03-31
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| キーワード | Organic lasers / D/A interactions / Near-infrared |
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| 研究実績の概要 |
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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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
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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| 今後の研究の推進方策 |
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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| 次年度使用額が生じた理由 |
This year, I mainly focused on the molecular structure design and theoretical calculation and synthesis, some chemical intermediates require special order, which takes time and then causes the delay. Meanwhile, considering the required optical instruments for the next year, such as quartz substrates, encapsulation sapphires, optical lens, oscilloscope, wave generation, laser sources and so on, are quite expensive, I would like to reserve the budget to the next fiscal year.
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