Eu 이온이 첨가된 KCl 결정의 형광특성

Abstract

Luminescence properties of KCl:Eu crystals are investigated by laser excitation spectroscopy. The results of the KCl:Eu crystals grown by the Czochralski (sample A) method are compared with those of the crystal grown by Bridgman method (sample B). The luminescence are observed not only from Eu²+ ions but also from Eu³+ ions in KCl crystal grown by Bridgman method. The holes are observed near the 415 nm and 465 nm in the emission spectra of Eu²+ which is attributed to energy transfer from 4f5d state of Eu²+to 5D3 and 5D2 levels of Eu²+, respectively. The Eu²+emission band for the sample A is much broader than that for the sample B and the peak position of the sample A is shifted to lower energy from 417 nm to 434 nm. The zero phonon lines for both samples are observed at 410.3 nm with several phonon peaks. Five holes for 5D2 level are observed between 462.5 and 467 nm which have never been reported up to now.