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Peng R.,Academy of Opto Electronic Technology | Pang B.,Academy of Opto Electronic Technology | Hu D.,Academy of Opto Electronic Technology | Chen M.,Academy of Opto Electronic Technology | And 7 more authors.
Journal of Materials Chemistry C | Year: 2015

A novel semiconductor-rubber-semiconductor (P3HT-PMA-P3HT) triblock copolymer has been designed and prepared according to the principle of thermoplastic elastomers. It behaves as a thermoplastic elastomer with a Young's modulus (E) of 6 MPa for an elongation at break of 140% and exhibits good electrical properties with a carrier mobility of 9 × 10-4 cm2 V-1 s-1. This novel semiconductor may play an important role in low-cost and large-area stretchable electronics. © 2015 The Royal Society of Chemistry.

Zhang G.,Academy of Opto Electronic Technology | Li P.,Academy of Opto Electronic Technology | Li P.,Hefei University of Technology | Tang L.,Hefei University of Technology | And 6 more authors.
Chemical Communications | Year: 2014

A bis(2-oxoindolin-3-ylidene)-benzodifuran-dione (BIBDF)-based low band gap polymer (PBIBDF-BT), containing a solubilizing alkyl chain bithiophene unit as a donor, has been synthesized. The polymer with a low-lying LUMO/HOMO energy level (-4.03/-5.55 eV) exhibits efficient ambipolar charge transport. The electron and hole mobilities are as high as 1.08 and 0.30 cm2 V -1 s-1, respectively. © The Royal Society of Chemistry 2014.

Wang X.,Academy of Opto Electronic Technology | Yuan M.,Academy of Opto Electronic Technology | Yuan M.,Hefei University of Technology | Xiong X.,Academy of Opto Electronic Technology | And 8 more authors.
Thin Solid Films | Year: 2015

Inkjet printing of 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-PEN), a small molecule organic semiconductor, is performed on two types of substrates. Hydrophilic SiO2 substrates prepared by a combination of surface treatments lead to either a smaller size or a coffee-ring profile of the single-drop film. A hydrophobic surface with dominant dispersive component of surface energy such as that of a spin-coated poly(4-vinylphenol) film favors profile formation with uniform thickness of the printed semiconductor owing to the strong dispersion force between the semiconductor molecules and the hydrophobic surface of the substrate. With a hydrophobic dielectric as the substrate and via a properly selected solvent, high quality TIPS-PEN films were printed at a very low substrate temperature of 35 °C. Saturated field-effect mobility measured with top-contact thin-film transistor structure shows a narrow distribution and a maximum of 0.78 cm2V- 1 s- 1, which confirmed the film growth on the hydrophobic substrate with increased crystal coverage and continuity under the optimized process condition. © 2015 Elsevier B.V. All rights reserved.

Zhang G.,Academy of Opto Electronic Technology | Peng R.,Academy of Opto Electronic Technology | Li P.,Academy of Opto Electronic Technology | Wang X.,Academy of Opto Electronic Technology | And 3 more authors.
Synthetic Metals | Year: 2013

Thieno[3,4-c]pyrrole-4,6-dione (TPD)-based polymer (PDTTPD) with head-to-head (H-H) linkage of 3-dodecylthiophene unit was synthesized by ferric chloride oxidative polymerization. The polymer was characterized by chemical analysis as well as thermal analysis, optical spectroscopy and cyclic voltammeter. PDTTPD polymer showed excellent thermal stability, had significantly red-shifted of absorption edge by its solid film compared to its solution and a deep highest occupied molecular orbital (HOMO) energy level of -5.82 eV. Polymer thin-film microstructures and morphologies were also investigated through atomic force microscope (AFM) and grazing-incidence X-ray diffraction (GIXD) which showed that the PDTTPD film is composed of rod-like crystalline grains and ordered structures. Organic thin-film transistors (OTFT) with common architectures were fabricated to evaluate OTFT performance and exhibited the preliminary hole mobility of 0.019 cm-2 V-1 s-1. © 2013 Elsevier B.V. All rights reserved.

Lu Y.-L.,Academy of Opto Electronic Technology | Lu Y.-L.,Academy of Telecommunication Technology | Lu Y.-L.,Hefei University of Technology | Sheng J.-C.,Academy of Opto Electronic Technology | And 6 more authors.
Chinese Journal of Liquid Crystals and Displays | Year: 2016

In order to optimize the effect of solid-state volumetric true 3D display and show even more realistic 3D images, this paper researched the grayscale of coded images and the contrast of display volume. The paper introduces solid-state volumetric true 3D display’s circuitry system, optical projection and the imaging display volume, according to the imaging principle of solid-state volumetric true 3D display. After analyzing and studying the main influences on the effect of 3D display, we come up with two methods to improve it. One way is reducing the image refresh rate and increasing the number of encoded image’s bits to improve the pixel’s gray level. Another method is changing the thickness of the liquid crystal light valve to enhance the contrast of the display volume. On the model machine of true 3D display, we not only succeed in achieving 32 levels of grayscale to increase the range of color from 4 096 to 32 768 and improve 1.2 times on contrast compared to the original model machine, but also can feel richer details and colors in image. The optimizing effect is obvious, and it make the machine show the details much clearly, the colors richer and the effect of 3D images more realistic. © 2016, Science Press. All rights reserved.

Lu H.,Academy of Opto Electronic Technology | Lu H.,Hefei University of Technology | Zhang S.,Academy of Opto Electronic Technology | Zhang S.,Hefei University of Technology | And 10 more authors.
New Journal of Chemistry | Year: 2014

A novel luminescent liquid crystal, (2Z,2′Z)-2,2′-(1,4- phenylene)bis(3-(4-(dodecyloxy)phenyl)acrylonitrile) (PDPA), is reported, which shows green, yellow and orange colors depending on the self-assembled structure. The luminescence of PDPA can vary between those three different colors invoked by mechanical shearing and thermal annealing. Moreover, an excellent liquid crystal phase transition of PDPA is observed using polarized optical microscopy (POM) and differential scanning calorimetry (DSC) analysis. Finally, a prototype device is fabricated that demonstrates rewritable fluorescence optical recording with multistimuli luminescence tuning. © 2014 the Partner Organisations.

Wang X.,Academy of Opto Electronic Technology | Yuan M.,Academy of Opto Electronic Technology | Yuan M.,Hefei University of Technology | Lv S.,Academy of Opto Electronic Technology | And 6 more authors.
Journal of Applied Physics | Year: 2015

The performance of organic thin film transistors (OTFTs) is heavily dependent on the interface property between the organic semiconductor and the dielectric substrate. Device fabrication with bottom-gate architecture by depositing the semiconductors with a solution method is highly recommended for cost-effectiveness. Surface modification of the dielectric layer is employed as an effective approach to control film growth. Here, we perform surface modification via a self-assembled monolayer of silanes, a spin-coated polymer layer or UV-ozone cleaning, to prepare surfaces with different surface polarities and morphologies. The semiconductor is inkjet-printed on the surface-treated substrates as single-line films with overlapping drop assignment. Surface morphologies of the dielectric before film deposition and film morphologies of the inkjet-printed semiconductor are characterized with polarized microscopy and AFM. Electrical properties of the films are studied through organic thin-film transistors with bottom-gate/bottom-contact structure. With reduced surface polarity and nanoscale aggregation of silane molecules on the substrates, semiconductor nucleates from the interior interface between the ink solution and the substrate, which contributes to film growth with higher crystal coverage and better film quality at the interface. Surface treatment with hydrophobic silanes is a promising approach to fabrication of high performance OTFTs with nonpolar conjugated molecules via solution methods. © 2015 AIP Publishing LLC.

Zhou S.-E.,Academy of Opto electronic Technology | Zhou S.-E.,Hefei University of Technology | Gao W.-Q.,Academy of Opto electronic Technology | Li Y.-J.,Academy of Opto electronic Technology | And 2 more authors.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2010

6-DOF (Degree of Freedom) head-tracking system based on CCD image processing is developed, and the measure errors of 6-DOFs are analyzed, which is caused by beacon accuracy and interdependence among 6-DOFs. In order to reduce the initial error caused by beacon accuracy, initial error correction program that the degrees return to zero at initial state is proposed. Then the initial errors are corrected without high-precision beacon. In addition, independent measurement program that the freedoms are extracted separately is proposed to avoid error transfer. Experimental results show that 6-DOF errors are reduced greatly after error correction and improved algorithm. In the azimuth angle range of -30°~30°, the standard deviation of azimuth angle a is 0.94°, the standard deviation of roll angle β and pitch angle y in 0° position are 0.30° and 0.02° respectively, the standard deviation of position x0 and y0 in 0 cm position are 0.94 cm and 0.01 cm respectively, and the standard deviation of position z0 in 112.31 cm position is 0.28 cm.

Wang X.,Academy of Opto Electronic Technology | Wang X.,Hefei University of Technology | Lin G.,Academy of Opto Electronic Technology | Li P.,Academy of Opto Electronic Technology | And 4 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2015

1,6-bis(trichlorosilyl)hexane (C6Cl), polystyrene (PS), and cross-linked polystyrene (CPS) were investigated as gate dielectric modified layers for high performance organic transistors. The influence of the surface energy, roughness and morphology on the charge transport of the organic thin-film transistors (OTFTs) was investigated. The surface energy and roughness both affect the grain size of the pentacene films which will control the charge carrier mobility of the devices. Pentacene thin-film transistors fabricated on the CPS modified dielectric layers exhibited charge carrier mobility as high as 1.11 cm2 V-1 s-1. The bias stress stability for the CPS devices shows that the drain current only decays 1% after 1530 s and the mobility never decreases until 13530 s. Copyright © 2015 American Scientific Publishers. All rights reserved.

Zhang G.,Academy of Opto Electronic Technology | Fu Y.,CAS Changchun Institute of Applied Chemistry | Qiu L.,Academy of Opto Electronic Technology | Xie Z.,CAS Changchun Institute of Applied Chemistry
Polymer (United Kingdom) | Year: 2012

New random poly{benzo[1,2-b:4,5-b']dithiophene-thieno[3,4-c]pyrrole-4,6- dione-pyrrolo[3,4-c]pyrrole-1,4-dione} (PBDT-TPD-DPP) based on benzo[1,2-b:4,5-b']dithiophene (BDT) as donor and thieno[3,4-c]pyrrole-4,6-dione (TPD, 60-90%), pyrrolo[3,4-c]pyrrole-1,4-dione (DPP, 10-40%) as acceptors were synthesized through Stille coupling reaction. The photophysical, electrochemical and photovoltaic properties of random polymers were investigated. The random polymers with high molecular weight (M n = 33.5-41.7 kDa) exhibited broad and strong absorption covering the spectra range from 350 nm up to 922 nm with absorption maxima at around 700 nm, the relatively deep highest occupied molecular orbital (HOMO) energy levels vary between -5.25 and -5.42 eV and suitable lowest unoccupied molecular orbital (LUMO) energy levels ranging from -3.85 to -3.91 eV. Polymer solar cells (PSC) based on these new random polymers were fabricated with device structures of ITO/PEDOT: PSS/random polymers: PC 71BM (1:2, w/w)/Ca/Al. The photovoltaic properties of random polymers were evaluated under AM 1.5G illumination (100 mW/cm 2). Devices based on the random polymers showed open circuit voltage (V oc) of 0.71-0.83 V, and power conversion efficiency (PCE) of 0.82-1.80%. © 2012 Elsevier Ltd. All rights reserved.

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