Photoluminescence properties and concentration quenching of Dy3+ doped YAG phosphors for domestic lighting

Y3Al5O12 : xDy(3+) (x = 0.02, 0.04, 0.06, 0.08, 0.1) phosphors were synthesized by sol- gel method. The strongest excitation peak at 352 nm was attributed to the 6 H-15/2 -> P-6(7/2) transition of Dy3+. Under the excitation of 352 nm, the emission spectra showed three peaks at about 483 nm (F-4(9/2) -> H-6(15/2)), 582 nm (F-4(9/2) -> H-6(13/2)) and 669 nm (F-4(9/2)6 -> H-11/2), respectively. The critical quenching concentration of Dy 3+ in YAG : Dy3+ phosphors was about 6mol%, which was associated to the cross- relaxation processes. The CIE chromatic coordinate of YAG : 0.02Dy(3+) phosphor was located at (0.385, 0.384) under 352 nm excitation, which was close to the National standard white light chromaticity (0.380, 0.380) for Energy Saving Lamp. Thus, white LED based on an UV LED chip and YAG : Dy phosphor has potential application for domestic lighting.