An open aperture z-scan study of Sr2CeO4 blue phosphor

► Sr2CeO4 blue phosphor has been prepared by a solid state reaction method. ► The XRD study confirms that the structure of the system is orthorhombic. ► The TEM reveals that Sr2CeO4 is composed of elongated spherical structures of length ∼0.2-0.6 μm. ► The FFT of TEM, XRD peaks and the JCPDS values are compared, from which the Sr2CeO4 phase is reconfirmed. ► A z-scan measurement gives the effective two-photon absorption coefficient to be 3.9 × 10−11 m/W.