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Synthesis and photoluminescence properties of high thermal stability Mn4+ in orthorhombic SrLa2Mg2W2O12 red phosphor for warm w-LEDs


We successfully synthesized SrLa2Mg2W2O12:xMn4+ (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 (I423K/I298K = 64.6%), and the internal quantum efficiency (IQE) of SLMW:0.01Mn4+ 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:0.01Mn4+ 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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This work was supported by the Doctoral Research Foundation of Hebei Normal University of Science and Technology (Grant No. 2016YB003). 2018 innovation and entrepreneurship training program for Chinese College Students (Grant No. 201810798006). Hebei Master's Innovation Subsidy Project in 2019 (Project No. CXZZSS2019118). Talent training project in Hebei Province (Project No. A201901059). National Natural Science Foundation of China (No. 51777138). Natural Science Foundation of Tianjin City (Nos. 18JCZDJC99700 and 18JCYBJC87400). We also gratefully acknowledge the instrumental analysis center of Hebei Normal University of Science and Technology.

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Correspondence to Zhi-wei Zhang or Xu-lin Lu.

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Shi, L., Han, Y., Wang, S. et al. Synthesis and photoluminescence properties of high thermal stability Mn4+ in orthorhombic SrLa2Mg2W2O12 red phosphor for warm w-LEDs. J Mater Sci: Mater Electron 31, 4677–4686 (2020).

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