The Optical Properties of Porous Opal Crystals Infiltrated with Organic Molecules

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作者：

YOSHINO，Katsumi，TADA，Kazuya，OZAKI，Masanori，ZAKHIDOV，Anvar，A.，BAUGHMAN

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摘要：

A fluorescent dye and a photochromic dye were infiltrated into polycrystalline samples of porous opal in order to determine the effects of opal repeat dimension on the optical properties of the dyes. These opals consist of faulted face-centered-cubic arrays of monodispersed, nanoscale Si0_2 splaeres. The observed absorption and fluoresceruce of tris(8-hydroxyquinoline) aluminum (Alq_3) depended on the lattice constauat of the opal. The Alq_3 exhibited ablue slaift of the absorption edge and a decrease of fltuorescence intensity xvith decreasing lattice conastant, Also,the stability of the plaotoclhromic behavior of cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl) ethene (CMTE)increased remarkably inside the opal matrix. These characteristics are possibly due to tlae interaction between the nano-structure-confined dyes and the surfaces of tlae SiO_2 spheres.

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关键词：

Experimental/ absorption coefficients fluorescence organic compounds porous materials silicon compounds spectral line shift/ optical properties porous opal crystals organic molecules fluorescent dye photochromic dye opal repeat dimension faulted face-centered-cubic arrays nanoscale SiO 2 spheres absorption tris(8-hydroxyquinoline) aluminum blue shift absorption edge decreasing lattice constant photochromic behavior cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl) ethene nano-structure-confined dyes SiO 2/ A7850E Impurity and defect absorption in insulators A7855K Photoluminescence in organic materials A7820D Optical constants and parameters (condensed matter)/ SiO2/bin O2 /bin Si/bin O/bin