Dyes in zeolites

Dye molecules tend to aggregate. In solution, dye molecules aggregate even at very low concentrations. After aggregation, the energy of excited dye molecules can be released easily through thermal relaxation, and therefore their optically active properties cannot be realized. If dye molecules are dispersed in the zeolite pores, the aggregation of molecules can be avoided, and as a result the dye molecules may exhibit excellent optical activities, such as lasing capacity etc/511 

80 K) has been observed for the composite formed by loading of phthalocyanine dye in zeolites.[74] It is worthwhile to point out that only in zeolites with water molecules can dye molecules exhibit apparent spectral hole-burning properties. This may be because the interactions between water molecules and the dye molecules in the pores of zeolites render the chromophoric groups of the dye molecules solvated, thus facilitating the electron-phonon interactions. 

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Figure 3 Dependence of the equilibrium constant K for insertion of a dye in zeolite L as a function of the occupation probability Pr, calculated for Ki = 7.75 X 10. ...

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