High Brightness Green Light-Emitting Diode Based on Silole-Containing Polyfluorenes
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A novel silole-containing polyfuorene (PSFN) was successfully synthesized by palladium(0)-catalyzed Suziki coupling reactions. Optoelectronic properties of the copolymer were characterized by NMR, UV absorption, photoluminescence, and electroluminescence (EL). The film of the copolymer showed silole-dominant green emission. An EL device of the copolymer with a sandwich configuration of ITO/Polymer/Al displayed exclusive silole emission, which peaked at ~532 nm with the CIE coordinate of (0.33, 0.54). The polymer layer contained a conjugated silole-containing polyfluorene that emits green light, trimethylolpropane trimethacrylate, a low vapor pressure highly crosslinkable liquid, and lithium trifluoromethane sulfonate at a weight ratio of 20:5:1. A dynamic p–i–n junction was formed in thin films of light-emitting polymers admixed with an ionically conductive medium. The PLEC device was turned on at 8 V and the brightness reached up to 2000 cd/m2 at 12 V.
KeywordsSilole-containing polymers Polymer light-emitting diodes Optical properties
This work was partially supported by National Natural Science Foundation of China (Grant no. 51003080), Educational Commission of Hubei Province of China (D20111502) and the Key Laboratory for Advanced Displays and System Application, Ministry of Education (Shanghai University).