Synthesis and photoluminescence properties of LaAlO sub(3):Mn super(4+), Na super(+) deep red-emitting phosphor

LaAlO sub(3):Mn super(4+) and LaAlO sub(3):Mn super(4+), Na super(+) deep red-emitting phosphors are synthesized by a solid-state reaction method in air. Their crystal structures, lifetimes, and luminescence properties are investigated, respectively. PLE spectrum monitored at 730 nm contains three PLE bands peaking at ~276, 325, and 500 nm within the range 200-550 nm, and PL spectrum with excitation 325 nm exhibits two PL band peaks located at ~703 and 730 nm owing to anti-stokes vibronic sidebands associated with the excited state super(2)E of Mn super(4+) ion and the super(2)E arrow right super(4)A sub(2) transition of Mn super(4+) ion, respectively. The optimal Mn super(4+) doping concentration is ~0.8 mol%. Lifetime of LaAl sub(0.992)O sub(3):0.8 %Mn super(4+) phosphor is ~0.92 ms. Na super(+) ion as charge compensator can improve obviously the luminescence properties of LaAlO sub(3):Mn super(4+) phosphor due to the charge compensation. The luminous mechanism of Mn super(4+) ion is explained by using Tanabe-Sugano diagram of Mn super(4+) ion in octahedral crystal field. The contents of this paper will be helpful to develop novel Mn super(4+)-doped materials and improve their luminescence properties.