Luminescence properties of La2O2S:Tb3 + phosphors and phosphor-embedded polymethylmethacrylate films. (5th July 2017)

• Record Type: Journal Article
• Authors: Wang, Lixi; Yang, Xiaojuan; Zhang, Qitu; Song, Bo; Wong, Chingping
• Is Part Of: Materials & design. Volume 125(2017)
• Page Start: 100
• Page End: 108
• Publication Date: 2017-07-05
• Subjects: La2O2S:Tb3 + -- PMMA films -- Green emission -- Phosphors; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2017.04.003
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: La2 O2 S:Tb 3 + phosphors were synthesized by a one-step K2 CO3 /Na2 CO3 flux method and phosphor-embedded polymethylmethacrylate (PMMA) films were fabricated by spin coating. Effects of calcination temperature and flux on the crystal structure, morphology and luminescence performance were evaluated by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, photoluminescence and calculation of CIE color coordinates. In the emission spectra, several emission peaks corresponding to 5 D4 → 7 F6, 5 D4 → 7 F5, 5 D4 → 7 F4, and 5 D4 → 7 F3 transitions appeared, with the 5 D4 → 7 F3 green emission being the dominant emission. The energy band gap, quantum efficiency, fluorescence decay curves, and thermal stability were also investigated with the aim of exploring the potential applicability of the synthesized phosphors in optical devices. Graphical abstract: Highlights: La2 O2 S:Tb 3 + phosphors can be successfully synthesized by a one-step K2 CO3 /Na2 CO3 flux method. As-prepared La2 O2 S:Tb 3 + phosphors have good thermal stability, lifetime and quantum efficiency. La2 O2 S:Tb 3 + embedded PMMA films can also achieve near ideal green light (x = 0.21, y = 0.71). La2 O2 S:Tb 3 + phosphors can be promising candidates for green-emitting materials.