Combustion Synthesis and Luminescence Behaviour of the Tb3+ Doped SrY2O4 Phosphor

Tb3+ doped SrY2O4 powder was prepared by the solution combustion synthesis method. The structure of the prepared phosphor was determined by using the powder x-ray diffraction technique and morphology by the field emission scanning electron microscopic technique. Under 254 nm ultra violet excitation, the phosphor gives an intense green emission around 543 nm. The other peaks were also present in blue and red regions, but the intensity is comparatively less. Study of the influence of Tb3+ concentration on emission spectra shows maximum intensity for blue and green emission at 2 mol.% of Tb3+ whereas the red emission at 620 nm quenched at 1 mol.%. Efficient green light emitting diodes (LEDs) were fabricated using Tb3+ doped phosphor based on near ultraviolet excited LED lights. Also, the prepared phosphor was useful for sensing applications, such as biological and chemical sensing. It is a promising candidate for applications in displays and optical devices.