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UNUSUAL ELECTRONIC AND PHOTONIC BEHAVIORS OF LINEAR POLY(SILOLYLACETYLENE)S AND HYPERBRANCHED POLY(SILOLYLENEARYLENE)S

Department of Chemistry, Center for Display Research, Open Laboratory of Chirotechnology, and Institute of Nano Science and Technology, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China

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JUNWU CHEN

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JACKY W. Y. LAM

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, and

BEN ZHONG TANG

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https://doi.org/10.1142/S0218863504001955Cited by:11 (Source: Crossref)

Abstract

A series of dendritic 2,3,4,5-tetraphenylsiloles (1–8) are prepared. Polymerizations of 4-8 are effected by transition-metal catalysts, giving linear (9-12) and hyperbranched polymers (14) in high yields. Whereas the silole polymers are practically nonluminescent when molecularly dissolved, they become emissive when aggregated in poor solvents or cooled to low temperatures. The light-emitting diodes using linear poly(silolylacetylene)s as active layers emit blue and green lights with current efficiency up to 1.45 cd/A. The hyperbranched poly(silolenearylene)s are nonlinear optically active and strongly attenuate the optical power of intense laser pulses, whose optical limiting performances are superior to that of C₆₀, a well-known optical limiter.

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