The central role of ligands in electron transfer from perovskite nanocrystals

MRS Advances ◽  
2017 ◽  
Vol 2 (43) ◽  
pp. 2327-2335 ◽  
Author(s):  
Alberto Privitera ◽  
Marcello Righetto ◽  
Renato Bozio ◽  
Lorenzo Franco
Keyword(s):  
Electron Transfer ◽  
Transfer Process ◽  
Photoinduced Electron Transfer ◽  
Fullerene Derivative ◽  
Mixed Solution ◽  
Electron Transfer Process ◽  
Perovskite Nanocrystals ◽  
Pulsed Epr ◽  
Photoinduced Processes

ABSTRACTThe nanoscale miniaturization of hybrid organic-inorganic perovskite has given rise to new functionalities, but the full understanding of the multifaceted properties of perovskite nanostructures is still incomplete. Using a combination of optical and magnetic resonance (EPR) spectroscopies, we focused our investigation on the photoinduced electron transfer process taking place in perovskite nanocrystals blended with the fullerene derivative PCBM. In particular we analyzed the different effect of two types of nanocrystal ligands, namely octylamine and oleylamine, on the photoinduced processes. The electron transfer process resulted in efficient fluorescence quenching in a mixed solution and in the formation of charges (PCBM anions) detected by EPR in the blends. Both the optical and EPR techniques revealed a stronger effect when the shorter ligand is present. Finally, pulsed EPR demonstrated the stabilization of the photogenerated charges in proximity of perovskite nanocrystals.

scholarly journals Two-electron transfer stabilized by excited-state aromatization

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Jinseok Kim ◽  
Juwon Oh ◽  
Seongchul Park ◽  
Jose L. Zafra ◽  
Justin R. DeFrancisco ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Excited States ◽  
Transfer Process ◽  
Comprehensive Understanding ◽  
Electron Transfer Process ◽  
Photoactive Materials ◽  
Donor Acceptor ◽  
Scientific Significance

Abstract The scientific significance of excited-state aromaticity concerns with the elucidation of processes and properties in the excited states. Here, we focus on TMTQ, an oligomer composed of a central 1,6-methano[10]annulene and 5-dicyanomethyl-thiophene peripheries (acceptor-donor-acceptor system), and investigate a two-electron transfer process dominantly stabilized by an aromatization in the low-energy lying excited state. Our spectroscopic measurements quantitatively observe the shift of two π-electrons between donor and acceptors. It is revealed that this two-electron transfer process accompanies the excited-state aromatization, producing a Baird aromatic 8π core annulene in TMTQ. Biradical character on each terminal dicyanomethylene group of TMTQ allows a pseudo triplet-like configuration on the 8π core annulene with multiexcitonic nature, which stabilizes the energetically unfavorable two-charge separated state by the formation of Baird aromatic core annulene. This finding provides a comprehensive understanding of the role of excited-state aromaticity and insight to designing functional photoactive materials.

Immobilization of a boronic receptor for fructose recognition: influence on the photoinduced electron transfer process

2003 ◽  
Vol 90 (1-3) ◽  
pp. 256-263 ◽  
Author(s):  
E.Vélez López ◽  
G.Pina Luis ◽  
J.L. Suárez-Rodrı́guez ◽  
I.A. Rivero ◽  
M.E. Dı́az-Garcı́a
Keyword(s):  
Electron Transfer ◽  
Transfer Process ◽  
Photoinduced Electron Transfer ◽  
Electron Transfer Process

Synthesis and Photoinduced Electron-Transfer Process of a Novel Triphenylamine-Substituted Polyfluorene–C60 Triad

2007 ◽  
Vol 13 (6) ◽  
pp. 1709-1714 ◽  
Author(s):  
Yu Chen ◽  
Mohamed E. El-Khouly ◽  
Xiao-Dong Zhuang ◽  
Nan He ◽  
Yasuyuki Araki ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Transfer Process ◽  
Photoinduced Electron Transfer ◽  
Electron Transfer Process

scholarly journals Tracing photoinduced electron transfer process in conjugated polymer/fullerene bulk heterojunctions in real time

2001 ◽  
Vol 340 (3-4) ◽  
pp. 232-236 ◽  
Author(s):  
Christoph J Brabec ◽  
Gerald Zerza ◽  
Giulio Cerullo ◽  
Sandro De Silvestri ◽  
Silvia Luzzati ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Real Time ◽  
Transfer Process ◽  
Conjugated Polymer ◽  
Photoinduced Electron Transfer ◽  
Bulk Heterojunctions ◽  
Electron Transfer Process

Relationship between the photoinduced electron transfer and binding modes of a pyrene–porphyrin dyad to DNA

2017 ◽  
Vol 19 (39) ◽  
pp. 27123-27131 ◽  
Author(s):  
Hyun Suk Lee ◽  
Ji Hoon Han ◽  
Jin Ha Park ◽  
Myeong Eun Heo ◽  
Kazutaka Hirakawa ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Transfer Process ◽  
Photoinduced Electron Transfer ◽  
Binding Modes ◽  
Electron Transfer Process

The emission of pyrenyl porphyrin was markedly enhanced in DNA, because a photoinduced electron transfer process was suppressed upon binding to DNA.

Sign in / Sign up

Export Citation Format

Share Document