Chen Junwu

Synthesis and optoelectronic properties of amino-functionalized carbazole-based conjugated polymers

A series of alcohol soluble amino-functionalized carbazole-based copolymers were synthesized via Suzuki coupling reaction. The pendent amino groups endow them high solubility in polar solvents, as well as efficient electron injection capability from high work-function metals. The relationships between the photophysical and electrochemical properties and the polymer backbone structure were systematically investigated. These alcohol-soluble carbazole-based copolymers were used as cathode interlayers between the high work-function metal Al cathode and P-PPV emissive layer in polymer light-emitting diodes with device structure of ITO/PEDOT:PSS/P-PPV/interlayer/Al. The resulting devices exhibited improved performance due to the better electron injection/transporting ability of the designed copolymers from Al cathode to the light-emitting layer.

Design, synthesis and photovoltaic properties of a series of new acceptor-pended conjugated polymers

A series of novel acceptor-pended conjugated polymers featuring a newly developed carbazole-derived unit are designed and synthesized. The relationships between chemical structure and optoelectronic properties of the polymers are systematically investigated. The control of UV-Vis absorption spectra and energy levels in resulting polymers are achieved by introducing suitable pended acceptor units. The photovoltaic properties of the resulting polymers are evaluated by blending the polymers with (6,6)-phenyl-C71-butyric acid methyl ester. The resulting solar cells exhibit moderate performances with high open-circuit voltage. Charge transport properties and morphology were investigated to understand the performance of corresponding solar cells.

Research progress of materials and devices for solution-processed organic light-emitting diodes

Significant progress has been made on organic light-emitting diodes (OLEDs) due to their potential application in full-color displays and solid-state lighting. Solution-processed OLEDs have attracted considerable attention due to their great potential for the fabrication of large-area displays and lightening devices through cost- effective ink-jet printing or roll-to-roll processing techniques. However, the commercialization of solution-processed OLEDs still needs further investigation on both molecular designs of novel optoelectronic materials and device fabrication procedures. This article reviews our recent work on solution-processed OLEDs materials and devices.