Photoluminescent Properties of (La,Eu,Sm)[sub 2]W[sub 3]O[sub 12] Red Phosphor for Near-UV-LED-Based Solid-State Lighting

Abstract

Luminescent properties of Sm 3+ -co-doped (La,Eu) 2 W 3 O 12 under near-UV light excitation have been investigated. L 0.5 Eu 1.5 W 3 O 12 shows efficient red emission at 616 nm and is about 1.7 times higher than Y 2 O 2 S:Eu 3+ in photoluminescence (PL) peak intensity under 395 nm light excitation. Meanwhile, 0.1 mol Sm 3+ -co-doped La 0.5 Eu 1.5 W 3 O 12 is over 5 times higher than Y 2 O 2 S:Eu 3+ in PL peak intensity under 405 nm light excitation. These results imply that Sm 3+ -co-doped (La,Eu) 2 W 3 O 12 is a candidate of red phosphors for near-UV light-emitting diodes (LEDs), though the Sm 3+ co-doping causes an increase in thermal quenching of PL.