Abstract
LaPO4@LaPO4:Dy3+(5%) nanocomposite (NC) was prepared by hydrothermal method at 200 °C. The obtained product was identified by x-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrational and photoluminescence (PL) spectroscopy. The powder of heterogeneous nanoparticles was formed by a single phase with a monoclinic structure. The emission spectra presented two intense bands, yellow and blue, under UV excitation. These emission bands are related to the electronic transitions from the 4F9/2 excited level to the 6H13/2 and 6H15/2 ground levels. An increase of the red emission intensity was observed compared to LaPO4:Dy3+(5%), while a little decrease of the lifetime was registered. According to the chromaticity diagram, the chromatic coordinates of the emitted light were very close to the luminous point of standard white phosphor. Cool white light for white light-emitting diodes (wLEDs) was obtained from a single NC phosphor and a single emitter ion. An advantage of the LaPO4@LaPO4:Dy3+(5%) is the reduction of phosphor cost using a small quantity of a single emitter ion.
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