Controlling the Spin Exchange Energy through Charge Transfer for Triplet State Management in Organic Semiconductors

Exchange energy; Lightemitting diode; Optoelectronics devices; Organic light-emitting; Photovoltaics; Real-world; Recent progress; Spin exchanges; State management; Triplet state; Chemistry (all); Chemical Engineering (all); Materials Chemistry; General Chemical Engineering; General Chemistry

Abstract :

[en] Optoelectronic devices fabricated from organic semiconductors, such as organic light emitting diodes (OLEDs) and photovoltaics (OPVs), have reached the point of viability in real-world applications. However, despite the rapid recent progress in the field, open questions remain around the role and management of spin-triplet states in these systems. In this perspective, we discuss recent advances in the manipulation of triplet states, with a particular focus on strategies that involve modulating the spin exchange energy through tuning the degree of charge transfer character in the excited state. We explore the equivalence between the localized and delocalized electronic excited state manifolds in OLEDs and OPVs and propose strategies for aligning the designs of OPVs with those of OLEDs. We consider that lessons from the successful triplet management strategies in the OLED field hold the key for improving the radiative efficiency of OPVs, which is necessary to drive power conversion efficiencies toward the important milestone of 20% and beyond.

Disciplines :

Chemistry

Author, co-author :

Gillett, Alexander J. ; Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom

Friend, Richard H. ; Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom

Beljonne, David ; Université de Mons - UMONS

Language :

English

Title :

Controlling the Spin Exchange Energy through Charge Transfer for Triplet State Management in Organic Semiconductors

Publication date :

23 August 2022

Journal title :

Chemistry of Materials

ISSN :

0897-4756

eISSN :

1520-5002

Publisher :

American Chemical Society

Volume :

Issue :

Pages :

7095 - 7105

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://pubs.acs.org/doi/pdf/10.1021/acs.chemmater.2c01301

Research unit :

S817 - Chimie des matériaux nouveaux

Research institute :

Complexys
Matériaux

Funders :

Engineering and Physical Sciences Research Council
Horizon 2020 Framework Programme
SUNRISE Program

Funding text :

A.J.G. and R.H.F. acknowledge support from the EPSRC (EP/M01083X/1 and EP/M005143/1) and the Strategic University Network to Revolutionise Indian Solar Energy (SUNRISE), EPSRC Grant Reference EP/P032591/1. This project has received funding from the ERC under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 101020167). D.B. is a Research Director of the Belgian “Fonds de la Recherche Scientifique” (F.R.S.-FNRS).

Available on ORBi UMONS :

since 13 January 2023

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