White light electroluminescence from graphene‐enhanced single polymer comprising two color emitters of equal molar ratios |
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| Authors: | Reagen Ying‐Tai Su Li‐Ko Chiu Shan‐Wei Weng Ying‐Shiun Chou Raymond Chien‐Chao Tsiang |
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| Institution: | 1. Department of Chemical Engineering, National Chung Cheng University, Chiayi 621, Taiwan, Republic of China;2. Institute of Opto‐Mechatronics, National Chung Cheng University, Chiayi 621, Taiwan, Republic of China |
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| Abstract: | White polymeric light‐emitting diode (WPLED) based on a single polymer, poly(3‐hexylthiophene‐alt‐9,9‐dioctylfluorene) (PTAF), has been successfully demonstrated. This conjugated alternating copolymer, PTAF, comprises 50 mol % of 3‐hexylthiophene which is an orange‐red color chromophore and 50 mol % 9,9‐dioctylfluorene which is a bluish‐green color chromophore. It was synthesized by Suzuki cross‐coupling reaction and has a molecular weight of 15,021 and polydispersity of 1.36. Nanocomposite consisting PTAF and graphene nanosheets enhances the optoelectronic properties and the device fabricated with a configuration of ITO/PEDOT:PSS/(PTAF + 1% graphene)/Ca/Al shows two‐color white electroluminescence with CIE 1931 coordinates of (0.28, 0.34). The white luminescence from a single polymer affords the WPLED device a simple structure and low fabrication cost. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011 |
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| Keywords: | conjugated polymer copolymerization electroluminescence graphene light‐emitting diodes (LED) luminescence nanocomposites PLED white light |
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