2022 Fiscal Year Research-status Report
Investigation of donor/acceptor interactions toward high-performance organic near-infrared (NIR) lasers beyond 900 nm
| Project/Area Number |
22K20536
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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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| Keywords | Organic lasers / D/A interactions / Near-infrared |
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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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| Causes of Carryover |
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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[Journal Article] A Donor-Acceptor Cage for Thermally Activated Delayed Fluorescence: toward a New Kind of TADF Exciplex Emitters2023
Author(s)
Lihua Chen, Chuanlong Li, Enguang Fu, Mengyang Li, Yoshiaki Kuboi, Zi-Ying Li, Zhenghong Chen, Jiaolong Chen, Xuelong Liu, Xun Tang, Lucas Frederic, Francois Maurel, Chihaya Adachi, Fabrice Mathevet, Shaodong Zhang
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Journal Title
ACS Materials Letters
Volume: 5
Pages: 1450-1455
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] Artificial p-n‐like Junction Based on Pure 2D Organic-Inorganic Halide Perovskite Structure Having Naphthalene Diimide Acceptor Moieties2023
Author(s)
Zhao Feng, Xuelong Liu, Kentaro Imaoka, Tomohiro Ishii, Ganbaatar Tumen‐Ulzii, Xun Tang, George F Harrington, Benoit Heinrich, Jean‐Charles Ribierre, Lise‐Marie Chamoreau, Lydia Sosa Vargas, David Kreher, Kenichi Goushi, Toshinori Matsushima, Guijiang Zhou, Fabrice Mathevet, Chihaya Adachi
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Journal Title
Advanced Optical Materials
Volume: 2202734
Pages: 1-8
DOI
Peer Reviewed / Int'l Joint Research
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