Preparation, optical properties and energy transfer of SrLaAlO4: Dy3+, Eu3+

A series of Dy3+/Eu3+ single doped and co-doped SrLaAlO4 phosphors was synthesized by the traditional high-temperature solid-state method, and their structure, morphology and optical properties were characterized. The X-ray diffraction (XRD) shows a small amount of doping with Dy3+ and Eu3+ does not change the crystal structure of the matrix SrLaAlO4 and the best synthesis temperature is 1450 °C. The scanning electron microscopy (SEM) indicates the particle size directly ranges from 1 to 5 μm roughly and the energy dispersive spectroscopy (EDS) patterns show that SrLaAlO4: Dy3+ phosphor and SrLaAlO4: Dy3+, Eu3+ phosphor were successfully synthesized. SrLaAlO4: Dy3+ phosphor can be effectively excited by near-ultraviolet light, producing two strong emission lights at 483 nm (blue light) and 579 nm (yellow light), presenting a cold white light; SrLaAlO4: Eu3+ phosphor can be effectively excited by near-ultraviolet light, producing red lights at 622 nm; the characteristic emission peaks of Dy3+ and Eu3+ can be shown simultaneously under the same excitation wavelength in SrLaAlO4: Dy3+, Eu3+ phosphor. By changing the relative doping concentration ratio of Dy3+ and Eu3+, the modulation of SrLaAlO4: Dy3+, Eu3+ phosphor from cold white to warm white light can be achieved. In addition, the study of the luminescent mechanism and lifetime shows that there is energy transfer between Dy3+ and Eu3+ in SrLaAlO4: Dy3+, Eu3+ phosphor.