Tunable single-phased white-emitting phosphors Na3YSi3O9:Tm3+, Dy3+

A single-phased Na3YSi3O9:Tm3+, Dy3+ phosphors was prepared by solid-phase reaction. X-ray diffraction and photoluminescence spectrum were used to investigate their structure and optical properties, respectively. Tm3+ and Dy3+ ions were introduced as blue and yellowish-green activators into Na3YSi3O9 lattice, respectively. Under ultraviolet excitation, the emission colors of the Na3YSi3O9:xTm(3+), (0.03-x) Dy3+ phosphors can be tuned from warm white to cool white and ultimately to yellowish-green through controlling the Tm3+ concentration within 0 <= x <= 0.03. A white-emitting phosphor Na3YSi3O9:0.01Tm(3+), 0.02Dy(3+) was achieved with chromaticity coordinates of (0.3117, 0.3250) and correlated color temperature of 6592 K. This is very close to the CIE Illuminant D-65 ((0.3127, 0.3290), 6504 K), which is a standard illuminant for the European Broadcasting Union (EBU) primary system colors. All the results indicate that the phosphors can potentially be used for white light emitting diodes. (C) 2013 Elsevier B.V. All rights reserved.