Two series of single-composition Ca8MgLu(PO4)7:Tb3+ and Ca8MgTb(PO4)7:Eu3+ phosphors were prepared by a high-temperature solid-state reaction technique, and their phase structures were characterized by powder X-ray diffraction (XRD). The excitation and emission spectra, and fluorescence decays were measured and discussed in detail. The results reveal that Tb3+ can efficiently transfer excitation energy to Eu3+via its 4f states and therefore sensitizes Eu3+ emission under NUV excitation. By adjusting the ratio of Eu3+ and Tb3+, we can tune the emission color of Ca8MgTb(PO4)7:Eu3+ from green to yellow, orange and pure red. For Ca8MgTb0.1(PO4)7:0.9Eu3+, the emission intensity at 150 °C is 87.44% of that at 25 °C, which makes it be a potential pure red phosphor for NUV LEDs.
ASJC Scopus subject areas
- Chemical Engineering(all)