Recently, an improved performance of displays and lamps requires high quality of phosphors for sufficient brightness and long-term stability. To improve the luminescent characteristics of the phosphors, extensive research has been carried out on rare earth-activated oxide-based phosphors because of good luminescence and chemical stability. Among these phosphors, Y₂O₃:Eu³⁺ and Gd₂O₃:Eu³⁺ exhibit strong ultraviolet (UV) and cathode ray excited luminescence. Y₂O₃:Eu³⁺ and Gd₂O₃:Eu³⁺ are also used as composite compositions to improve the luminescent properties.

In this work, the red phosphors (Y,Gd)₂O₃:Eu³⁺ were synthesized by liquid phase precursor methods. We investigated luminescent properties of the samples by the effect of firing temperature. The samples were investigated by analyzing their particle size and crystal structure with scanning electron microscopy (SEM) and X-ray diffractometer (XRD). Also the excitation and emission spectra were measured at a room temperature using photoluminescence (PL) under UV and VUV range.

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