Intense and Stable Near-Infrared Emission from Light-Emitting Electrochemical Cells Comprising a Metal-Free Indacenodithieno[3,2-b]thiophene-Based Copolymer as the Single Emitter
Artikel i vetenskaplig tidskrift, 2017

We report on the synthesis, characterization, and application of a series of metal-free near-infrared (NIR) emitting alternating donor/acceptor copolymers based on indacenodithieno[3,2-b]thiophene (IDTT) as the donor unit. A light-emitting electrochemical cell (LEC), comprising a blend of the copolymer poly[indacenodithieno[3,2-b]thiophene-2,8-diyl-alt-2,3-diphenyl-5,8-di(thiophen-2-y1)- quinoxaline-5,5'-diy1] and an ionic liquid as the single-layer active material sandwiched between two air-stable electrodes, delivered NIR emission (lambda(peak) = 705 nm) with a high radiance of 129 mu W/cm(2) when driven by a low voltage of 3.4 V. The NIR-LEC also featured good stress stability, as manifested in that the peak NIR output from a nonencapsulated device after 24 h of continuous operation only had dropped by 3% under N-2 atmosphere and by 27% under ambient air. This work accordingly introduces IDTT-based donor/acceptor copolymers as functional metal-free electroluminescent materials in NIR-emitting devices and also provides guidelines for how future NIR emitters should be designed for further improved performance.

charge-transport

diodes

deep-red

enhanced photovoltaic performance

highly efficient

conjugated polymers

electroluminescent polymers

field-effect transistors

organic electronics

heterojunction solar-cells

Författare

Shi Tang

LunaLEC AB

Umea universitet

Petri Henrik Murto

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Xiaofeng Xu

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Christian Larsen

LunaLEC AB

Umea universitet

Ergang Wang

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

L. Edman

LunaLEC AB

Umea universitet

Chemistry of Materials

0897-4756 (ISSN) 1520-5002 (eISSN)

Vol. 29 7750-7759

Ämneskategorier

Materialteknik

Kemiteknik

DOI

10.1021/acs.chemmater.7b02049