27 September 2013 Synthesis of fluorene-based polyelectrolytes tethering different counterions for single-component white light-emitting electrochemical cells
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Abstract
A series of polyfluorene (PF) electrolytes bearing Br−, BF4 −, or PF6 − counterions were synthesized and characterized. 2,1,3-benzoselenadiazole moieties were incorporated into polymer main chains to produce single-component white lightemitting polymers. The thermal stability of Br-containing ionic PF was decreased because of the Hofmann elimination occurred at higher temperature. By replacing Br− with BF4 − or PF6 − counterions, the thermal stability of polymers was significantly improved. The emission intensity around 550 nm was decreased for ionic polyelectrolytes. The optimized spin-coated light-emitting electrochemical cell (LEC) with the configuration of ITO/PEDOT/polymer/Ag showed a maximum luminescence efficiency of 1.56 lm/W at a low operation bias of 3 V. The single-component LEC device exhibited pure white light emission with CIE’1931 coordinates approaching (0.33, 0.33) and high color rendering index (CRI < 85), referring to its potential use in solid-state-lighting application.
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Sheng-Hsiung Yang, Sheng-Hsiung Yang, Chia-Sheng Tsai, Chia-Sheng Tsai, Bo-Cun Liu, Bo-Cun Liu, Hai-Ching Su, Hai-Ching Su, } "Synthesis of fluorene-based polyelectrolytes tethering different counterions for single-component white light-emitting electrochemical cells", Proc. SPIE 8829, Organic Light Emitting Materials and Devices XVII, 88291U (27 September 2013); doi: 10.1117/12.2022853; https://doi.org/10.1117/12.2022853
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