GROWTH AND CHARACTERISATION OF DYSPROSIUMDOPED MgSrAl10O17 PHOSPHOR FOR LUMINESCENCE.

In this report, MgSrAl₁₀O₁₇:xDy³ nanophosphors were fabricated by combustion method for different concentrations (x = 0, 0.0005, 0.001, 0.005, 0.01 and 0.02) of Dysprosium (Dy). The synthesised nanophosphors were characterised by XRD, SEM, TEM, FTIR, PL, and TL. The XRD (X-ray diffraction) showed crystalline hexagonal structure with preferred orientation of (107) plane. SEM (Scanning electron microscope) result shows the formation of nanosheets in an irregular shape. TEM (transmission electron microscope) study revealed the nanoparticles an average diameter of 30 nm. TL (Thermo-luminance) properties included TL glow curves and TL response for different concentrations of Dy after exposure to 700 Gy gamma rays. LiMgBO₃ shows the major TL glow peak at 100oC. TL intensity was found to increase with an increase in the dopant Dy concentration and was found to show the best result for x = 0.02. Further, PL (Photoluminescence) characterisation of MgSrAl₁₀O₁₇:0.02 Dy³⁺ phosphor exhibits two main emission peaks at 484 and 575 nm due to Dy³⁺ ion, when excited with 350 nm wavelength. So, emission of the Dy3+ luminescence is close to the white region, and hence MgSrAl₁₀O₁₇:xDy³⁺ phosphor can be a good candidate in solid-state lighting for white light emission. In kinetic parameters: activation energy (E) and order of kinetics (b), are calculated using the Chen's Peak Shape method. [ABSTRACT FROM AUTHOR]