Figure 3
Luminescence properties of Ba0.93Eu0.07Al2O4 phosphor. (a) Normalized luminescence excitation and emission spectra of Ba0.93Eu0.07Al2O4 phosphor at room temperature. The excitation spectrum (blue curve) was obtained by monitoring 580 nm emission and the emission spectrum (orange curve) was acquired under 440 nm light excitation. (b) Temperature dependence of the lifetime of Eu2+ emission in Ba0.93Eu0.07Al2O4 at temperatures from 77 to 450 K. A 355 nm Nd:YAG laser was used as the excitation source and the monitored emission wavelength is 580 nm. Inset is the luminescence decay curves measured at 77, 293 and 423 K. (c) Temperature dependence of the integrated emission intensity of Ba0.93Eu0.07Al2O4 excited by 440 nm light at temperatures from 77 to 450 K. Open squares: data recorded during the heating process from 77 to 450 K. Open blue triangles: data recorded during the cooling process from 450 to 293 K. Inset is the emission spectra at 293, 373, 403 and 423 K.
