Synthesis and luminescence characterization of Ce3+?activated Y2CaAl2MgZr2O12?garnet phosphor for white light emitting diodes
Journal
Materials Research Express
Journal Volume
6
Journal Issue
12
Date Issued
2019
Author(s)
Abstract
A series of novel Ce3+ activated Y2CaAl2MgZr2O12 phosphors were synthesized via a modified solid-state method. The formation of garnet structure was clearly observed from the XRD studies. The elemental mapping images confirmed the homogeneous distribution of all elements in Y2CaAl2MgZr2O12:Ce3+. Y2CaAl2MgZr2O12:Ce3+ emitted greenish yellow emission peaking at 530 nm by absorbing blue light of 420 to 460 nm. The greenish yellow emission was due to the 5d-4f transition of Ce3+ ions. The optimum photoluminescence intensity was observed for 3 mol% concentration of Ce3+ ions. The thermal stability of photoluminescence emission of Y2CaAl2MgZr2O12:0.03Ce3+ was also investigated at 300 to 480 K and the activation energy was calculated to be 0.32 eV. Commercial red (Sr, Ca)AlSiN3:Eu phosphors blended with Y2CaAl2MgZr2O12:0.03Ce3+ and coated on blue emitting LED chips to fabricated white light emitting diodes (WLEDs). The electroluminescence spectra of the fabricated WLEDs exhibited pure white chromaticity (0.36, 0.37) with high CRI of 94 and low CCT of 4381 K. The spectral characteristic results indicated a promising garnet phosphor for blue excited white light emitting diode applications.
SDGs
Type
journal article