Photoluminescence spectroscopy of silica-based mesoporous materials

Article Abstract:

The experimental study of photoluminescence (PL) at 300 and 90 K from the mesoporous silicas (MSs) [ordered (MCM-41) and disordered (DMSs)] of variously sized pores induced either by ArF laser light (lambda (sub exc) = 193 nm) or by Nd:YAG (yttrium-aluminum-garnet) laser light (lambda (sub exc)=266 nm) is reported. The results reveal that PL spectra measured with 266-and 193-nm excitations are somewhat different because of the different mechanisms of excitation: direct one-proton and indirect through the TP-produced free excitons (FEs), respectively.

Excited state chemistry

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Two photoexcitation steps for photometathesis of propene over FSM-16

Article Abstract:

Photometathesis of propene over siliceous mesoporous silica, FSM-16, consisting of two photoexcitation steps is discovered to be a novel type metathesis system. UV light is necessary for the first step, while visible light as well as UV light is effective for the second step is observed.

Cyclic Crude and Intermediate Manufacturing, Propylene, Chemistry, Physical and theoretical, Physical chemistry

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Time resolved ultraviolet photoluminescence of mesoporous silica

Article Abstract:

The optical properties of sol-gel synthesized porous silica excited by synchrotron radiation in the 4-10 eV range are studied. The spectral and temporal characteristics of the ultraviolet photoluminescence at about 3.7 eV are reported.

Electric properties, Synchrotron radiation, Silicon dioxide

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