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 degrees C. The scanning electron microscopy (SEM) indicates the particle size directly ranges from 1 to 5 mu m 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. (c) 2023 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.