Photoluminescent properties of the promising red-emitting phosphor LiGd1−xEux(MoO4)2 for WLEDs. (July 2015)

• Record Type: Journal Article
• Authors: Li, Juan; Lu, Cheng; Lu, He; Yang, Xiumei; Zhu, Bo; Yu, Hongyou; Sheng, Jiawei; Che, Shenglei
• Is Part Of: Ceramics international. Volume 41(2015)Supplement 1
• Page Start: S725
• Page End: S728
• Publication Date: 2015-07
• Subjects: Eu3+ doped molybdates -- White light-emitting diodes -- Red phosphor -- Luminescence -- Solid-state reaction method; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.03.179
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A series of LiGd1− x Eu x (MoO4 )2 ( x =0.01–1) red-emitting phosphors were synthesized by the conventional solid-state reaction method. XRD was used to determine the structure of the samples, showing that the products are single phased with sheelite-like structure. The photoluminescent properties were characterized by a fluorescence spectrophotometer and the effects of the calcination temperature, the holding time as well as the doping concentration, especially the low doping concentration of Eu 3+, were discussed. Upon excitation with 395 nm, the LiGd(MoO4 )2 :Eu 3+ phosphors show strong red emission lines at 617 nm which are ascribed to the forced electric dipole transition 5 D0 – 7 F2 of Eu 3+ . The appropriate calcination temperature and holding time are 900 °C and 5 h, respectively. With increasing Eu 3+ doping concentration, the emission intensity of the samples is enhanced and no obvious concentration quenching occurs. The prepared samples are potential red phosphors for near UV White LEDs application.