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The first localized surface plasmon resonance (LSPR)-based multicolor electrochromic device with five reversible optical states is demonstrated. In this device, the size of deposited silver nanoparticles is electrochemically controlled by using a voltage-step method in which two different voltages are applied successively. The electrochemically size-controlled silver nanoparticles enable a reversible multiple-color change by a shift of the LSPR band.

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Novel carbazole-containing polymers, i.e., poly (3,6-di-tert-butyl-N-(p-ethynylphenyl)carbazole) [poly(t-Bu 2CzPA)] and poly(N-(p-ethynylbenzoyl)carbazole) [poly(CzCOPA)] were synthesized by the polymerization of the corresponding carbazole-containing acetylene monomers using [(norbornadiene)-RhCl]2-Et3N, WCl6-n-Bu4Sn, and WCl4 catalysts. The UV-vis absorption band edge wavelengths of the polymers obtained by the polymerization with W catalysts were longer than those of the Rh-based polymers. The photoluminescence quantum yield of the W-based poly(t-Bu2CzPA) was 55%, while that of the Rh-based one was as low as 3.6%. The photocurrent of poly(t-Bu2CzPA) was 40-50 times higher than the dark current. Poly(t-Bu2CzPA) in conjunction with iridium complexes exhibited electroluminescence (13-18 cd/m 2 ).