Preparation and investigation of Dy3+-doped Ca9LiGd2/3(PO4)7 single-phase full-color phosphor.

Graphical abstract Highlights • A novel single-phased Ca 9 LiGd 2/3 (PO 4) 7 : x Dy3+ phosphor was firstly synthesized. • Its structure, luminescent properties are well studied and characterized. • It was promising as a single-component white-light-emitting phosphor for w-LEDs. Abstract Novel single-phased white-light-emitting Ca 9 LiGd 2/3 (PO 4) 7 : x Dy3+ (x = 0.02, 0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) β-Ca 3 (PO 4) 2 -type phosphate phosphors were synthesized. The phase structure, luminescence, and thermal stability of the phosphors were characterized by X-ray powder diffraction analysis, photoluminescence excitation and emission spectra, thermal quenching, and decay curves. XRD analysis confirmed the phase formation of Ca 9 LiGd 2/3 (PO 4) 7 :Dy3+ materials. Under the excitation of 352 nm, the emission of the Ca 9 LiGd 2/3 (PO 4) 7 :0.20Dy3+ sample centered at blue (488 nm) and yellow (580 nm), which corresponded to 4F 9/2 –6H 15/2 transition and 4F 9/2 –6H 13/2 transition. The optimum dopant concentration of Dy3+ ions was around 20 mol%, and the critical transfer distance of Dy3+ was calculated as 18 Å. The thermal-quenching temperature was above 500 K for Ca 9 LiGd 2/3 (PO 4) 7 :0.20Dy3+. The developed phosphor has a great potential as a single-component white-light-emitting phosphor for UV-light-emitting diodes. [ABSTRACT FROM AUTHOR]