Fluorescence and crystal structure of SrLa1-x AlO4 :xEu3+ phosphor synthesized using a sol-gel method.

Abstract

The SrLa1-x AlO4 :xEu3+ phosphors were obtained using one calcination of a precursor synthesized using a sol-gel method. When excited at 396 nm, this phosphor emits a red light mixed with several strong peaks centred at 596 nm, 616 nm and 625 nm, attributed to 5 D0 →7 F1, 2 transitions of Eu3+ ions, respectively. The concentration quenching occurs at x = 1.5 mol%mol of SrLa1-x Eux AlO4 and the critical energy transfer distance is calculated to be 13.13 Å, the dipole-dipole interaction was found to play a role. In addition, the colour purity could be up to 97.5%. Simultaneously, the thermal stability of SrLaAlO4 :Eu3+ was measured and the thermal quenching was found at c. 275°C (T0.5 ), the excitation energy was 0.19 eV. Current results demonstrate that SrLaAlO4 :Eu3+ could be a red component candidate for white light LEDs pumped by near-UV chips.