In the present case the bi exponential fitting

Fig. 7. Emission spectra Metformin 500 °C annealed Pb2+ co-doped YVO4:5Dy3+ nanoparticles (Pb = 0, 1, 3, 5, 7 and 10 at.%) under excitation wavelength at (a) 280 nm and (b) 315 nm. (c) Plot of integrated area vs concentration of Pb2+ for 500 °C annealed at different excitation wavelengths. (d) Plot of integrated area vs concentration of Pb2+ for as-prepared, 500 and 900 °C annealed samples under excitation wavelength 315 nm.Figure optionsDownload full-size imageDownload as PowerPoint slide
Fig. 8. Emission spectra of 900 °C annealed Pb2+ co-doped YVO4:5Dy3+ nanoparticles (Pb = 0, 1, 3, 5, 7 and 10 at.%) under excitation wavelength at (a) 280 nm and (b) 315 nm. (c) Plot of nyctinasty integrated area vs concentration of Pb2+ for 500 °C annealed at different excitation wavelengths.Figure optionsDownload full-size imageDownload as PowerPoint slide
Fig. 9. Luminescence spectra of (a) 500 and (b) 900 °C annealed 1 at.% Pb2+ co-doped YVO4:5Dy3+ nanoparticle at different excitation wavelengths.Figure optionsDownload full-size imageDownload as PowerPoint slide