Photoluminescence properties of Li2Mg2 (WO4)3:Eu3+ red phosphor with high color purity for white LEDs applications.

A series of novel Eu 3+ doped tungstate Li 2 Mg 2 (WO 4 ) 3 red phosphors were successfully synthesized by a solid-state reaction method. The phase structure, photoluminescence properties and thermal stability of the phosphor were investigated in detail. The Li 2 Mg 2 (WO 4 ) 3 :Eu 3+ phosphors show dominant emission peak at 620 nm ( 5 D 0 → 7 F 2 transition) upon the strongest excitation at 398 nm ( 7 F 0 → 5 L 6 transition). The optimal doping concentration of Eu 3+ is determined to be 0.06 mol in order to obtain the maximum emission intensity. The dependence of the emission intensity on temperature denominates that Li 2 Mg 2 (WO 4 ) 3 :Eu 3+ phosphor has a relatively good thermal quenching effect. The Commission Internationale del’Eclairage coordinates was measured as (0.678, 0.322) with high color purity, being close to the National Television Standard Committee system standard for red chromaticity (0.670, 0.330). The above studies indicate that Li 2 Mg 2 (WO 4 ) 3 :Eu 3+ is a promising candidate as the red phosphor for near ultraviolet-based white LEDs application. [ABSTRACT FROM AUTHOR]