Eu and Dy activated (Sr0.90Ca0.10)3(PO4)2 phosphors for near- UV LED

Abstract

The new efficient trivalent Eu and Dy activated (Sr0.90Ca0.10)3(PO4)2 phosphors were prepared by the conventional solid state method. X-ray powder diffraction analysis confirmed the formation of (Sr0.90Ca0.10)3(PO4)2 host lattice. The Eu3+ PL emission spectrum was observed in (Sr0.90Ca0.10)3(PO4)2 phosphors at 590 (orange) and 614 nm (red) region, the spectrum due to 5D0-7F1 and 5D0-7F2 transitions at near UV excitation, respectively. (Sr0.90Ca0.10)3(PO4)2: Dy3+ excited by 350 nm near-ultraviolet (NUV) light, the phosphors show an efficient blue and yellow band emissions, which originates from the 4F9/2-6H15/2 and 4F9/2-6H13/2 transitions of Dy3+ ion, respectively. The excitation spectra of the phosphors are broadband extending from 340 to 400 nm, which are characteristics of NUV excited LED. The investigated prepared phosphors are suitable for a NUV excited LED.