Luminescence properties of La2O2S:Tb3+ phosphors and phosphor-embedded polymethylmethacrylate films

Publication date: 5 July 2017
Source:Materials & Design, Volume 125
Author(s): Lixi Wang, Xiaojuan Yang, Qitu Zhang, Bo Song, Chingping Wong
La2O2S:Tb³⁺ phosphors were synthesized by a one-step K2CO3/Na2CO3 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 ⁵D4→⁷F6, ⁵D4→⁷F5, ⁵D4→⁷F4, and ⁵D4→⁷F3 transitions appeared, with the ⁵D4→⁷F3 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.

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