Emission color tuning of laminated and mixed SiAlON phosphor films by electrophoretic deposition

The laminated or mixed films of SiAlON phosphors were prepared on ITO glasses by electrophoretic deposition (EPD). Three types of SiAlON phosphors, Eu doped Ca-α-SiAlON, β-SiAlON and CaAlSiN3, which emit the lights of yellow (λ = 585 nm), green (540 nm) and red (620 nm), respectively, were used for the color tuning. The photoluminescence (PL) properties of the laminated or mixed films were characterized by blue-light (λ = 450 nm) irradiation through the ITO glass substrates. The effects of the lamination or mixture of the phosphors are characterized by the broadness of the PL spectra.