Luminescent properties of ZnS:Ce,Y phosphor

The ZnS:Ce phosphor together with a co-activator Y³⁺ ion shows a bright saturated blue luminescence whose spectrum is a band with a peak wavelength of 450 nm. The chromaticity coordinates are x = 0.15 and y = 0.09, and thus this phosphor would be good for the blue primary color in displays and light sources. The blue luminescence is due to the 5d-4f internal transition of the Ce³⁺ ion. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)