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Cai W.,Institute of Polymer Optoelectronic Materials and Devices | Gong X.,Institute of Polymer Optoelectronic Materials and Devices | Cao Y.,Institute of Polymer Optoelectronic Materials and Devices
Solar Energy Materials and Solar Cells | Year: 2010

The development of polymer solar cells is rapidly accelerating as the need of new clean energy sources. Polymer solar cells are attractive because they can be manufactured on plastic substrates by a variety of printing techniques. In this article, we provided an overview on basic operational principles and recent development of polymer solar cells. The possible routes for improvement in power conversion efficiency, stability, and the effects toward manufacturing of polymer solar cells were summarized and highlighted. © 2009 Elsevier B.V. All rights reserved. Source


Li A.,Institute of Polymer Optoelectronic Materials and Devices | Li Y.,Institute of Polymer Optoelectronic Materials and Devices | Cai W.,Institute of Polymer Optoelectronic Materials and Devices | Zhou G.,Hong Kong Baptist University | And 7 more authors.
Organic Electronics: physics, materials, applications | Year: 2010

We report highly efficient white polymer light-emitting devices (WPLEDs) using a newly synthesized, deep-blue emitting fluorene-co-dibenzothiophene-S,S-dioxide copolymer as host, doped with two narrow-bandgap iridium complexes. Despite the low-lying triplet energy levels of the host, phosphorescent quenching by the polyfluorene copolymer host was significantly suppressed with poly(N-vinylcarbazole) (PVK) as hole-injecting, anode buffer layer. The energy transfer process had been studied via transient photoluminescence spectra and confirmed that PVK layer is responsible for the efficient electrophosphorescence in the devices. As a result of balanced red-green-blue (RGB) emission from the host and the triplet emitters, white emission with Commission Internationale de L'Eclairage (CIE) coordinates of (0.278, 0.312) was achieved, with a peak luminous efficiency of 15.1 cd A-1 and a color rendering index (CRI) of 79-86. © 2009 Elsevier B.V. All rights reserved. Source


Liu J.,Institute of Polymer Optoelectronic Materials and Devices | Hu S.,Institute of Polymer Optoelectronic Materials and Devices | Zhao W.,Institute of Polymer Optoelectronic Materials and Devices | Zou O.,Institute of Polymer Optoelectronic Materials and Devices | And 4 more authors.
Macromolecular Rapid Communications | Year: 2010

Novel poly[(fluorene)-co-(2,8-dioctyldibenzothiophene-S,S-dioxide-3,7-diyl) ]s were synthesized. The octyl group on the 2,8-dioctyldibenzothiophene-S,S- dioxide (DOSO) unit improved the solubility of the polymers and broadened the optical band gap from 2.95 to 3.20 eV as the content of DOSO unit increases. The electroluminescence (EL) spectra of polymers show CIE coordinates around (0.16, 0.07) independent of the ratio of DOSO units in the polymers, owing to the ICT and steric hindrance dual-function. A high efficiency of 3.1 cd A-1 (EQE = 3.9%) was obtained with the configuration of ITO/PEDOT:PSS/polymer/Ba/Al. The results indicate that PF-3,7DOSOs could be a promising candidate for saturated blueemitting polymers with spectral stability and high efficiency. (Figure Presented) © 2010 WILEY-VCH Verlag GmbH 81 Co. KGaA,. Source

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