1
|
Malatong R, Sato T, Kumsampao J, Minato T, Suda M, Promarak V, Yamamoto HM. Highly Durable Spin Filter Switching Based on Self-Assembled Chiral Molecular Motor. Small 2023; 19:e2302714. [PMID: 37154235 DOI: 10.1002/smll.202302714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Indexed: 05/10/2023]
Abstract
Chiral molecules have recently received renewed interest as highly efficient sources of spin-selective charge emission known as chiral-induced spin selectivity (CISS), which potentially offers a fascinating utilization of organic chiral materials in novel solid-state spintronic devices. However, a practical use of CISS remains far from completion, and rather fundamental obstacles such as (i) external controllability of spin, (ii) function durability, and (iii) improvement of spin-polarization efficiency have not been surmounted to date. In this study, these issues are addressed by developing a self-assembled monolayer (SAM) of overcrowded alkene (OCA)-based molecular motor. With this system, it is successfully demonstrated that the direction of spin polarization can be externally and repeatedly manipulated in an extremely stable manner by switching the molecular chirality, which is achieved by a formation of the covalent bonds between the molecules and electrode. In addition, it is found that a higher stereo-ordering architecture of the SAM of OCAs tailored by mixing them with simple alkanethiols considerably enhances the efficiency of spin polarization per a single OCA molecule. All these findings provide the creditable feasibility study for strongly boosting development of CISS-based spintronic devices that can simultaneously fulfill the controllability, durability, and high spin-polarization efficiency.
Collapse
Affiliation(s)
- Ruttapol Malatong
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan
- The Graduate University for Advanced Studies, Myodaiji, Okazaki, 444-8585, Japan
- Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand
| | - Takuro Sato
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan
- The Graduate University for Advanced Studies, Myodaiji, Okazaki, 444-8585, Japan
| | - Jakkapan Kumsampao
- Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand
| | - Taketoshi Minato
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan
| | - Masayuki Suda
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Vinich Promarak
- Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand
| | - Hiroshi M Yamamoto
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan
- The Graduate University for Advanced Studies, Myodaiji, Okazaki, 444-8585, Japan
| |
Collapse
|
2
|
Kumsampao J, Chaiwai C, Chasing P, Chawanpunyawat T, Namuangruk S, Sudyoadsuk T, Promarak V. A Simple and Strong Electron-Deficient 5,6-Dicyano[2,1,3]benzothiadiazole-Cored Donor-Acceptor-Donor Compound for Efficient Near Infrared Thermally Activated Delayed Fluorescence. Chem Asian J 2020; 15:3029-3036. [PMID: 32748490 DOI: 10.1002/asia.202000727] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/29/2020] [Indexed: 11/11/2022]
Abstract
Despite the success of thermally activated delayed fluorescent (TADF) materials in steering the next generation of organic light-emitting diodes (OLEDs), effective near infrared (NIR) TADF emitters are still very rare. Here, we present a simple and extremely high electron-deficient compound, 5,6-dicyano[2,1,3]benzothiadiazole (CNBz), as a strong electron-accepting unit to develop a sufficiently strong donor-acceptor (D-A) interaction for NIR emission. End-capping with the electron-donating triphenylamine (TPA) unit created an effective D-A-D type system, giving rise to an efficient NIR TADF emissive molecule (λem =750 nm) with a very small ΔEST of 0.06 eV. The electroluminescent device using this NIR TADF emitter exhibited an excellent performance with a high maximum radiance of 10020 mW Sr-1 m-2 , a maximum EQE of 6.57% and a peak wavelength of 712 nm.
Collapse
Affiliation(s)
- Jakkapan Kumsampao
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand
| | - Chaiyon Chaiwai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand
| | - Pongsakorn Chasing
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand
| | - Thanyarat Chawanpunyawat
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand
| | - Supawadee Namuangruk
- National Nanotechnology Center, National Science and Technology Development Agency, Pathumthani, 12120, Thailand
| | - Taweesak Sudyoadsuk
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand
| | - Vinich Promarak
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand.,Research Network of NANOTEC-VISTEC on Nanotechnology for Energy, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand
| |
Collapse
|