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In the adsorption process at the higher Alq solution (1.2 mM), the segregation of the Alq crystals grown on the C18MPS-3.0 and P123MPS-5.4 films was observed (Figures 3(b) and 3(c)), suggesting that the adsorption behavior dominantly occurs at the concentration less than 1.2 mM.
The X-ray diffraction patterns suggested that the ordered hexagonal mesopore arrangements are preserved with the adsorption of Alq. Alq was adsorbed effectively into the films to apparently give transparently yellow-color, and the photographs of the films with the maximum adsorbed amounts of Alq in Figures 4(c) and 4(d) indicate the preservation of transparency with the adsorption.
In order to discuss the state of the Alq molecules in the mesopore, the photoluminescence spectra of the Alq adsorbed in the MPS films were investigated as a function of the adsorbed amount of Alq.
Considering the luminescence maxima of Alq in benzene at 517 nm, ethanol at 515 nm, and methanol at 514 nm [26] and their monomodal spectral shapes, it is suggested that the state of Alq molecules in the mesopores was different from that in the solution state.
The photoluminescence spectral changes, the integrated intensity, and maxima plots with the temperature range between 80 and 300 K of [alpha]-Alq powder, Alq/C18MPS-3.0, and Alq/P123MPS with the adsorbed amount of Alq at 131 and 91 [micro]mol/g, respectively, were shown in Figure S4 (Supplementary Material).
Alq was successfully adsorbed without segregation into the MPS films with the different pore sizes.
Caption: Figure 2: (a-c) Fluorescent microscope images and (d-f) photoluminescence spectra of (a, d) neat Alq powder and solvated Alq powders recrystallized from (b, e) ethanol and (c, f) benzene.
Caption: Figure 3: (a) Adsorption isotherms of Alq into C18MPS-3.0 and P123MPS-5.4 from benzene solution.
The Alq/C18MPS-3.0 and Alq/P123MPS-5.4 films with the adsorbed amounts of Alq at 267 and 117 [micro]mol/(g of MPS) were evaluated by (c, d) photographs and (e, f) AFM topographic images (observation area: 5.0 [micro][m.sup.2]).
Caption: Figure 5: Photoluminescence spectra of (a) Alq/C18MPS-3.0, (b) Alq/P123MPS-5.4 films with the different adsorbed amounts of Alq (insets: fluorescent microscope images of the Alq/C18MPS-3.0 and Alq/P123MPS-5.4 films with the adsorbed amount of Alq at 267 and 117 [micro]mol/(g of MPS), resp.), (c) I, (d) I per 1 mol, and (e) [I.sub.525]/[I.sub.462] changes with the adsorbed amount.
Caption: Figure 6: Possible host-guest and guest-guest interaction changes with increasing the adsorbed amount of Alq in the mesospores.