ペロブスキートナノ結晶からの三重エネルギー転送
Xiao Luo1,2, Guijie Liang3, Yaoyao Han1,4
1State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China.
Journal of the American Chemical Society
|June 2, 2020
まとめ
この研究は,ペロブスキートナノ結晶から分子への電子伝送媒介のトリプルエネルギー伝送を実証し,以前の方法の限界を克服しました. この新しいメカニズムは分子三重感受性におけるより広範な応用を可能にします.
科学分野:
- 材料科学
- 写真化学
- ナノテクノロジー
背景:
- ナノ結晶からの三重エネルギー伝達は 光子アップコンバージョンのようなアプリケーションに不可欠です
- 以前の研究では,II-VIナノ結晶のホールトラップによって阻害された電子転送経路の穴移転を中心に研究が行われました.
研究 の 目的:
- ペロブスキットナノ結晶からの電子伝送媒介のトリプルエネルギー伝送を調査し,確立する.
- 分子三重感受性のメカニズムと可能性を探求する.
主な方法:
- CsPbCl3とCsPbBr3のペロブスキートナノ結晶を研究するために超高速光譜を用いた.
- CdSナノ結晶を用いた制御実験を行い,穴埋めの役割を明らかにした.
主要な成果:
- ペロブスキートナノ結晶からロダミン分子への電子伝達媒介のトリプルエネルギー伝送を成功裏に実証した.
- CdSのナノ結晶に穴を埋めると 電子伝送経路を阻害する事が確認されました
- 感受性の高いロダミン三重体の光子向上変換とシングレット酸素生成の応用を紹介した.
結論:
- ナノ結晶/分子インターフェースの間の三重エネルギー伝送のための完全な枠組みを確立した.
- 電子移転メディエーションは穴移転メディエーションよりも要求が低く,一般的に実装可能である.
- ペロブスキットナノ結晶を用いた分子トリプレット感受性の範囲を拡大した.
関連する概念動画
01:27Photosystem I
69.1K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
69.1K
01:34The Z-Scheme of Electron Transport in Photosynthesis
12.7K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
12.7K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.8K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.8K
01:22Photosystem II
78.0K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
78.0K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
2.1K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
2.1K
01:29The Photochemical Reaction Center
5.1K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
5.1K