Towards ultra-broad emission band by luminescent film with continuously tunable emission wavelength

摘要

Abstract: Thin films of Ca1-xSrxS:Eu with tunable photoluminescence are fabricated by cathodic magnetron-assisted co-sputtering. Broad and intense luminescence has been observed, and its color shifts progressively from yellow to dark red by changing thin film composition. One promising application of these thin films is for improving the color rendering index of YAG:Ce-coated blue LEDs up to 93. Still broader emission is expected by creating a continuous composition gradient which can be realized by adjusting the power ratio applied on the two targets during the film deposition.