Abstract
Three polyfluorene derivatives (P1–P3) emitting blue, green and red light were prepared via a Suzuki coupling method. Polyhedral oligomeric silsesquioxanes (POSS) were integrated into the center core of the derivatives to create stellar light-emitting polymers (POSS-P1–POSS-P3). The glass-transition and decomposition temperatures were raised after introducing POSS moieties. The starlike polymers showed a reduced emissive band at 540 nm when annealing at 200 °C. The result implies that integrated POSS at the center core suppresses the keto effect generally occurring for polyfluorenes. Double-layer light-emitting devices of indium tin oxide/poly(ethylenedioxythiophene)/polymer/Ca/Al were fabricated to evaluate polymer potential. Compared with pristine polymers, the maximum brightness and the current efficiency of devices using POSS-containing polymers as active layers were enhanced. A blending method using P1 or POSS-P1 as the host matrix further improved device performance.
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Chen, KB., Chen, HY., Yang, SH. et al. Synthesis and Opto-electrical Properties of Stellar Polyfluorene Derivatives Containing Polyhedral Oligomeric Silsesquioxanes as the Center Core. J Polym Res 13, 237–245 (2006). https://doi.org/10.1007/s10965-005-9031-9
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DOI: https://doi.org/10.1007/s10965-005-9031-9