Multifunctional materials for OFETs, LEFETs and NIR PLEDs
Journal article, 2014

A family of phthalimide-thiophene copolymers with linear and branched alkyl chains attached to the imide nitrogen have been synthesized. Their optical and electronic properties were investigated along with their applications in OFETs and LEFETs. The phthalimide-thiophene copolymer having a C16 straight alkyl chain on the phthalimide yielded the highest mobilities and PLQE with mobilities of 1 x 10(-3) cm(2) V-1 s(-1) for holes and 1 x 10(-2) cm(2) V-1 s(-1) for electrons with a PLQE of similar to 28% in the solid state. Since these polymers are ambipolar and emissive, they have proven to be useful for applications as a host material for NIR PLEDs. In this study a 1% loading of NIR emitting DAD segments based on bisthienyl(thiadiazoloquinoxaline) or bisthienyl(benzotriazolothiadiazole) were incorporated into the phthalimide-thiophene polymerization. Using the branched CH(C8H17)(2) alkyl chain on the host phthalimide-thiophene copolymer combined with the bisthienyl(benzotriazolothiadiazole) emitter resulted in the most efficient (emission maximum >= 850 nm) single layer NIR-emitting PLED to date with an EQE of 0.27% emitting at 885 nm.

POLYMER

RECOMBINATION ZONE

GAP

HOLE-MOBILITY

THIN-FILM TRANSISTORS

FIELD-EFFECT TRANSISTORS

CONJUGATED POLYMER

LIGHT-EMITTING-DIODES

COPOLYMERS

AMBIPOLAR

SOLAR-CELLS

Author

Timothy Steckler

Chalmers, Chemical and Biological Engineering, Polymer Technology

M. J. Lee

Kookmin University

University of Cambridge

Z. Chen

University of Cambridge

Pierre and Marie Curie University (UPMC)

O. Fenwick

University of Strasbourg

University College London (UCL)

Mats Andersson

Chalmers, Chemical and Biological Engineering, Polymer Technology

F. Cacialli

University College London (UCL)

H. Sirringhaus

University of Cambridge

Journal of Materials Chemistry C

2050-7526 (eISSN)

Vol. 2 26 5133-5141

Subject Categories

Materials Engineering

Textile, Rubber and Polymeric Materials

DOI

10.1039/c4tc00342j

More information

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6/8/2018 5