A novel single-phased white light emitting phosphor with single Eu2+ doped whitlockite structure

Abstract

Exploring novel efficient single-phased full spectrum phosphor with individual activator doping for white light emitting diodes is highly significative and benefit for scientific activities. Herein, by designing and modifying the β-Ca3(PO4)2-type structure, the Ca19MgNa2(PO4)14: Eu2+ (CMNP) phosphor was proposed as a single-phased full spectrum white phosphor. The phase purity and clear crystal structure were then determined by employing the Rietveld refinement and energy dispersive X-ray spectroscopy. PLE and PL spectra indicated CMNP: xEu2+ (0.1% ≤ x ≤ 1.0%) phosphors could be well fitted with 365 nm LED chip and exhibited a full spectrum emission band covering all visible lights of 400–750 nm belonging to the 5d−4f transitions of Eu2+. Further, the selective occupation of Eu2+ ions in different cation sites and luminescence kinetics depending on the Eu2+ dopants were characterized by theoretical calculation, Rietveld refinement results and decay curves. Finally, the WLED device fabricated by (near)-UV WLED chip and CMNP: 0.75 %Eu2+ phosphor could present excellent color temperature (6643 K) and CIE coordinate (0.308, 0.346). The current work manifests that Ca19MgNa2(PO4)14: Eu2+ had excellent luminescent property, which could be used in optical applications.