White Light–Generation Phosphor Ba[sub 2]Ca(BO[sub 3])[sub 2]:Ce[sup 3+], Mn[sup 2+] for Light-Emitting Diodes

Abstract

and co-doped phosphors have been prepared at under a reduced atmosphere, and their luminescence properties have also been investigated by tuning the concentration of activators. White light-emitting phosphors excited with UV or violet light could be obtained in and coactivated phosphors by adjusting contents appropriately. Two types of centers, occupying the and sites, respectively, emit blue and green light, whereas the enters the sites and emits red light. The energy transfer involving , , and have also been observed by analyzing their photoluminescence (PL) and PL excitation spectra. The energy transfer efficiencies from different sites to were calculated by decline and growth of their emission relative intensity. In light of the principle of energy transfer and appropriate tuning of activator contents, we demonstrated that : , is potentially useful as an UV or near-UV convertible phosphor for white light–emitting diodes. Moreover, their CIE chromaticity coordinates, color temperature, and color-rendering index Ra have also been calculated according to corresponding PL spectra under 345 and radiation.