Abstract
The reflection spectra and the excitation spectra of various emissions have been measured for Na6Al6Si6O24(NaI)2x and Na6Al6Si6O24(NaBr)2x sodalite optical ceramics (x≅0.8) by means of VUV radiation of 5–30 eV at 8 K. The analysis of these spectra revealed two groups of electronic excitations (EEs). The photons of hν>8.5 eV generate EEs of an aluminosilicate carcass, while 5.5 to 8.0 eV photons cause the excitation of I− and Br− ions in the cages of an aluminosilicate matrix. The luminescence of Na4I, Na4Br, Na3I and Na3Br centers has been detected at the direct optical excitation of these centers as well as at the formation of EEs of the aluminosilicate carcass. The processes of creation, relaxation and multiplication of EEs as well as the process of VUV photochromism in sodalites are discussed.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
