Funct. Mater. 2022; 29 (4): 494-501.

doi:https://doi.org/10.15407/fm29.04.494

Optical spectroscopy of cyanine dyes J-aggregates in porous TiO2 matrices

I.Yu.Ropakova1, P.V.Pisklova1, I.I.Bespalova1, I.A.Borovoy1, O.G.Viagin1, P.V.Mateychenko2, S.L.Yefimova1, A.V.Sorokin1

1Institute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Lenin Ave., 61001 Kharkiv, Ukraine
2Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Lenin Ave., 61001 Kharkiv, Ukraine

Abstract: 

The features of the formation of three cyanine dyes J-aggregates in a porous TiO2 matrix formed by positively charged microparticles were studied using optical spectroscopy. The formation of the J-aggregates was found to be better for cationic PIC and L-21 dyes compared to anionic BIC dye despite the charge of TiO2 particles. This manifests itself both in the color of the matrices and in the spectral properties of J-aggregates. For all the dyes, the degree of aggregation was much lower than in solutions, and the monomers made a significant contribution to the absorption spectra. For J-aggregates in TiO2 matrices, a weaker dipole-dipole interaction and a greater static disorder were found. Considering the spectral properties and stability, the PIC dye can be attributed to the best dye for the formation of J-aggregates in a porous TiO2 matrix formed by microparticles.

Keywords: 
cyanine dye, J-aggregate, TiO<sub>2</sub> particle, porous matrix, luminescence, absorption.

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