Multicolor emission in single-phase Ca(MoO4)(WO4):Dy3+, Eu3+ materials prepared by rapid synthesis

Abstract

Solid state materials with dynamic emission colors form the basis of future smart lighting systems for a wide variety of everyday applications [1]. For this reason, the rare earth ions (RE3+) doping materials overtake the design of such systems exhibit easy tuning of colors and likewise offer straightforward spectral interpretations with their narrow lines characteristics. In this work we report preparation as well as the spectroscopic properties of the single phase new highly tricolor luminescent emitting of Eu3+, Dy3+ codoped into the Ca(MO4)(WO4) host lattice. The materials were prepared at room temperature exposed to ultrasonic irradiation for 30 min from stoichiometry aqueous solutions of Na2MoO4, Na2WO4, CaCl2, EuCl3 and DyCl3 (XDy: 0.3; XEu: 0.1 mol% of the Ca2+ amount). The as prepared materials were washed with distilled water, filtered and after dried. In the excitation spectrum, there is a broad band in the range 220-350 nm corresponding to the Ligandto- metal charge transfer (LMCT) (Fig.). This band can be deconvoluted into two bands. The band located at 270 nm is due only to the charge transfer O2-W6+, whereas that centered at 300 nm indicates energy transfer from O2-Mo6+, and O2-Eu3+. The emission arising mainly from the Dy3+ 4F9/26H15/2, 6H13/2 and Eu3+ 5D07F2, 7F4 transitions are due to the 488, 575, 614 and 700 nm, respectively (Fig.). In the 353 nm excitation wavelength the phosphor exhibits warm white color emission. These results suggest that Ca(MoO4)(WO4):Dy3+, Eu3+ could act as a multicolor phosphor in solid state-lighting technology.