Preparation and luminescent properties of orange reddish emitting phosphor LaMgAl11O19:SM3+

An orange reddish emitting phosphor, LaMgAl11O19:Sm3+, was synthesized by a high temperature solid-state reaction, and the phase formation, crystal structure and luminescence properties were investigated respectively. The LaMgAl11O19:Sm3+ phosphor presents a highly intense orange reddish emission peak under the near ultraviolet excitation at 403 nm, which is corresponds to the (4)G(5/2) -> H-6(J) (J = 5/2, 7/2, 9/2 and 11/2) transitions of Sm3+ ions. It was found that the dipole-dipole interactions mainly results in the concentration quenching in the LaMgAl11O19:Sm3+ phosphor with a critical quenching concentration at about 5 mol%. The temperature dependence of luminescence properties was studied from 25 to 200 degrees C and indicated that LaMgAl11O19:0.05Sm(3+) phosphors had a relatively higher quenching temperature. The chromatic properties of LaMgAl11O19:0.05Sm(3+) phosphor have been found to have chromaticity coordinate of (0.578, 0.420). All these properties indicate that the orange reddish emitting LaMgAl11O19:Sm3+ phosphor has a potential application in w-LEDs. (C) 2014 Elsevier B.V. All rights reserved.