Incorporation of Designed Donor−Acceptor−Donor Segments in a Host Polymer for Strong Near-Infrared Emission from a Large-Area Light-Emitting Electrochemical Cell
Artikel i vetenskaplig tidskrift, 2018

Cost-efficient thin-film devices that emit in the nearinfrared (NIR) range promise a wide range of important applications. Here, the synthesis and NIR application of a series of copolymers comprising poly[indacenodithieno[3,2-b]thiophene-2,8-diyl] (PIDTT) as the host and different donor−acceptor−donor (DAD) segments as the guest are reported. We find that a key design criterion for efficient solid-state host-to-guest energy transfer is that the DAD conformation is compatible with the conformation of the host. Such host−guest copolymers are evaluated as the emitter in light-emitting electrochemical cells (LECs) and organic light-emitting diodes, and the best performance is invariably attained from the LEC devices because of the observed balanced electrochemical doping that alleviates issues with a noncentered emission zone. An LEC device comprising a host−guest copolymer with 4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b′]dithiophene as the donor and benzo[c][1,2,5]thiadiazole as the acceptor delivers an impressive near-infrared (NIR) performance in the form of a high radiance of 1458 μW/cm2 at a peak wavelength of 725 nm when driven by a current density of 500 mA/cm2, a second-fast turn-on, and a good stress stability as manifested in a constant radiance output during 3 days of uninterrupted operation. The high-molecular-weight copolymer features excellent processability, and the potential for low-cost and scalable NIR applications is verified through a spray-coating fabrication of a >40 cm2 large-area device, which emits intense and uniform NIR light at a low drive voltage of 4.5 V.

NIR

near-infrared

large-area device

light-emitting electrochemical cell

LEC

solution processing

copolymer

Författare

Petri Henrik Murto

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Flinders University

Shi Tang

LunaLEC AB

Umeå universitet

Christian Larsen

LunaLEC AB

Umeå universitet

Xiaofeng Xu

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Andreas Sandström

LunaLEC AB

Juuso Pietarinen

Oulun Yliopisto

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Benedikt Bagemihl

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Birhan A. Abdulahi

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Addis Ababa University

Wendimagegn Mammo

Addis Ababa University

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Mats Andersson

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Flinders University

Ergang Wang

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

Ludvig Edman

LunaLEC AB

Umeå universitet

ACS Applied Energy Materials

2574-0962 (ISSN)

Vol. 1 4 1753-1761

Ämneskategorier

Polymerkemi

Materialkemi

Organisk kemi

Den kondenserade materiens fysik

DOI

10.1021/acsaem.8b00283

Mer information

Senast uppdaterat

2019-03-28