期刊
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
卷 31, 期 6, 页码 4677-4686出版社
SPRINGER
DOI: 10.1007/s10854-020-03022-5
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资金
- Doctoral Research Foundation of Hebei Normal University of Science and Technology [2016YB003]
- 2018 innovation and entrepreneurship training program for Chinese College Students [201810798006]
- Hebei Master's Innovation [CXZZSS2019118]
- Talent training project in Hebei Province [A201901059]
- National Natural Science Foundation of China [51777138]
- Natural Science Foundation of Tianjin City [18JCZDJC99700, 18JCYBJC87400]
We successfully synthesized SrLa2Mg2W2O12:xMn(4+) (x = 0.002, 0.004, 0.006, 0.008, 0.010, 0.012, 0.014) phosphors through a high-temperature solid-state reaction. The phase of sample was shown by X-ray powder diffraction (XRD). The morphology of the sample was observed by field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM), which showed the irregular morphology of SrLa2Mg2W2O12 (SLMW) powders. Additionally, the photoluminescence excitation (PLE), emission (PL) and ultraviolet-visible reflection spectra were also presented. As shown in results, the phosphor could be stimulated by the ultraviolet (UV) and near ultraviolet (NUV) light and then exhibited far-red emission (697 nm). The optimum doping concentration of Mn4+ is 1 mol%. The thermal stability of phosphors has been investigated and discussed (I-423K/I-298K = 64.6%), and the internal quantum efficiency (IQE) of SLMW:0.01Mn(4+) phosphors is as high as 51.2%. Finally, a far-red light-emitting diodes (LEDs) was fabricated by combining a 365 nm near-ultraviolet InGaN chip with SLMW:0.01Mn(4+) phosphor. The Color Rendering Index (CRI), correlated color temperature (CCT) and luminescent efficiency (LE) values were 29.5, 1159 K and 5.6 lm/W, respectively. All of these indicated that SLMW:Mn4+ as a far-red phosphor can be applied to LEDs lamp and it has enormous potential applications in white light-emitting diodes (w-LEDs).
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