Photoluminescence of gamma-irradiated Beryllium oxide.

This study analyses the emission and excitation spectra of Beryllium Oxide (BeO) unirradiated and irradiated with Co gamma radiation because of its potential use in radiation dosimetry. Deconvolution of the spectra showed that using an excitation wavelength λ = 330 nm, four emission bands centered at 404, 430, 468 and 545 nm are obtained; These emission bands appear in both irradiated and non-irradiated BeO; however, the irradiated samples exhibited an extra emission band centered at 416 nm. The excitation spectrum was obtained by setting the emission monochromator at a wavelength λ = 400 nm.

On tuning the fluorescence emission of porphyrin free bases bonded to the pore walls of organo-modified silica.

A sol-gel methodology has been duly developed in order to perform a controlled covalent coupling of tetrapyrrole macrocycles (e.g., porphyrins, phthalocyanines, naphthalocyanines, chlorophyll, etc.