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2 Optica Applicata

2 2010

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Photoluminescence features of AgBr nanoparticles formed in porous glass matrices

Doycho I. K., Gevelyuk S. A., Ptashchenko O. O., Rysiakiewicz-Pasek E., Tolmachova T. M., Tyurin O. V., Zhukov S. O.

Optica Applicata

2010

Vol. 40, nr 2

323--332

The photoluminescence of AgBr nanoparticles formed by a two stage liquid-gas microsynthesis technology in two types of porous glass with different sizes of pores was investigated. Polyvinyl alcohol (Polinol) was used as a binder. It has been found that AgBr nanoparticles in the glasses with smaller pores luminesce more intensively, and we attribute this phenomenon to the differ-ences in pore size distributions. The luminescence spectra were shown to have two maxima corresponding to AgBr nanoparticles formed within the nanopores of two different sizes characteristic of each of the matrices. In both cases, the spectra excited by xenon lamp irradiation are more intensive than those stimulated by a 337-nm nitrogen laser. Comparing the maxima shifts in the phosphorescence excitation spectra with ones in phosphorescence spectra we can conclude that the luminescence and phosphorescence centers in AgBr nanoparticles are of identical nature in the matrices of both types. The investigation results fit neatly into the inherently consistent quantum confinement model and are well correlated with the poroscopic spectra of both types of glass.

Aggregation of dyes in porous glass

Tyurin O. V., Bercov Y. M., Zhukov S. O., Levitskaya T. F., Gevelyuk S. A., Doycho I. K., Rysiakiewicz-Pasek E.

Optica Applicata

2010

Vol. 40, nr 2

311--321

The research examines the interaction of dye molecules with their dimers (H aggregates) and the more complex formations (J aggregates) developing in porous glass. The use of porous glass when dealing with dye aggregation has resulted in obtaining photoluminescence dimers of the J aggregating dye, the formation of which is difficult under normal conditions. In addition, the porous glass matrix contributes to a substantial reduction in the interaction of photoexcited states of both a molecular and an aggregated dye, thus helping maximize the luminescence efficiency of porous glass-distributed dyes.