日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

This review focuses on progress in the development of periodic mesoporous organosilicas (PMOs) bridging luminescent organic groups and directions for future researches on them. Incorporation of luminescent organic groups in the PMO framework allows for the preparation of materials with dissimilar luminescent groups in two spatially separated regions; the framework and the mesopore channels, in contrast to conventional mesoporous silicas which bear luminescent dyes only in the channels. In the multi-dye system, excitation energy transfer from the framework donors to acceptors in the mesochannels is observed. Biphenyl-bridged PMO exhibits efficient light absorption due to the dense packing of chromophores in the framework, and a high luminescence quantum yield (ϕ=0.45), demonstrating the potential of PMOs as a luminescent material. Naphthalene-bridged PMOs with amorphous and crystal-like frameworks show excimer and monomeric fluorescence, respectively, indicating that the interaction among bridging organic groups in PMOs differs between these frameworks. On the other hand, efficiently visible-light fluorescent PMOs (ϕ=0.66) were developed by introduction of bulky substituents to the bridging oligo(phenylenevinylene) moieties. These recent developments highlight the potential of luminescent PMOs as a new technology, which should be supported by further investigation of the optical properties and functionalization of PMOs.