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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

Shi Tang ; Petri Henrik Murto (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Xiaofeng Xu (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Christian Larsen ; Ergang Wang (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Ludvig Edman
Chemistry of Materials (0897-4756). Vol. 29 (2017), 18, p. 7750-7759.
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2017-10-20. Senast ändrad 2017-10-30.
CPL Pubid: 252660

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Polymerteknologi

Ämnesområden

Kemiteknik
Materialteknik

Chalmers infrastruktur