Possible pore size effects on the state of tris(8-quinolinato)aluminum(iii) (Alq3) adsorbed in mesoporous silicas and their temperature dependence
Literature Information
Motohiro Tagaya, Makoto Ogawa
The states of tris(8-quinolinato)aluminum(III) (Alq3) adsorbed in mesoporous silicas with different pore sizes (2.5, 3.1 and 5.0 nm) were investigated. Alq3 was successfully occluded into the mesoporous silicas from solution and the adsorbed amount of Alq3 per BET surface area was effectively controlled by changing the added amount Alq3 to the solution. The state of Alq3 in the mesopore varied depending on the pore size as well as the adsorbed amount of Alq3 as revealed by variation of the photoluminescence spectra. The luminescence of the adsorbed Alq3 was found to be temperature-dependent, indicating the mobility of the adsorbed Alq3 to temperature variations. The temperature-dependence also depended on the pore size. The guest–guest interactions between Alq3 molecules as well as the host–guest interactions between Alq3 and the mesopore were controlled by the pore size.
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