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- Title
Fabrication and enhanced photoluminescence properties of $$\hbox {NaLa}(\hbox {MoO}_{4})_{2}$$ : $$\hbox {Sm}^{3+}$$ , $$\hbox {Bi}^{3+}$$ phosphors with high efficiency white-light-emitting.
- Authors
Zhang, Xingshuang; Zhou, Guangjun; Zhou, Juan; Zhou, Haifeng; Kong, Peng; Yu, Zhichao; Zhan, Jie
- Abstract
The tetragonal scheelite-type $$\hbox {Sm}^{3+}\hbox {/Bi}^{3+}$$ ions co-doped with $$\hbox {NaLa}(\hbox {MoO}_{4})_{2}$$ phosphors were synthesized by a facile sol-gel and combustion process using citric acid as complexing agent. The crystal structure and morphology of these as-prepared samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Furthermore, UV-absorption and the photoluminescence (PL) properties of these phosphors were systematically investigated and the PL of the phosphors shows strong white light emissions. Efficient energy transfer from the $$\hbox {MoO}_{4}^{2-}$$ group or $$\hbox {Bi}^{3+}$$ ions to $$\hbox {Sm}^{3+}$$ ions was established by PL investigation excited at 405 nm. The PL intensity of the studied materials was investigated as a function of different $$\hbox {Sm}^{3+}$$ and $$\hbox {Bi}^{3+}$$ concentrations. The PL investigations revealed that the phosphors exhibit apparent characteristic emissions, which is ascribed to the transition from the ground state energy level $$^{4}\hbox {G}_{5/2}$$ to excited state energy levels $$^{6}\hbox {H}_{\mathrm{J}}$$ ( $$J= 5/2, 7/2, 9/2$$ ) and the $$\hbox {NaLa}(\hbox {MoO}_{4})_{2}$$ : 4 mol% $$\hbox {Sm}^{3+}$$ and $$\hbox {NaLa}(\hbox {MoO}_{4})_{2}$$ : 4 mol% $$\hbox {Sm}^{3+}$$ , 8 mol% $$\hbox {Bi}^{3+}$$ present white emissions with the CIE coordinates of (0.350, 0.285) and (0.285, 0.229), respectively. The absolute quantum efficiencies of the phosphors are 40% ( $$\hbox {NaLa}(\hbox {MoO}_{4})_{2}$$ : 4 mol% $$\hbox {Sm}^{3+}$$ ) and 52% ( $$\hbox {NaLa}(\hbox {MoO}_{4})_{2}$$ : 4 mol% $$\hbox {Sm}^{3+}$$ , 8 mol% $$\hbox {Bi}^{3+}$$ ), respectively.
- Subjects
NANOFABRICATION; PHOTOLUMINESCENCE; PHOSPHORS; LIGHT emitting diodes; SCHEELITE; SOL-gel processes; CRYSTAL structure
- Publication
Bulletin of Materials Science, 2017, Vol 40, Issue 5, p983
- ISSN
0250-4707
- Publication type
Article
- DOI
10.1007/s12034-017-1456-3