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Highly efficient red phosphor Cs2GeF6:Mn4+ for warm white light-emitting diodes

机译:用于暖白色发光二极管的高效红色荧光粉Cs2GeF6:Mn4 +

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摘要

Red phosphor Cs2GeF6:Mn4+ has been synthesized by the cation exchange method. The as-prepared phosphor was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometer (EDS), atomic absorption spectrophotometer (AAS), thermogravimetry (TG) and differential scanning calorimetry (DSC). Its optical properties were investigated by photoluminescence spectra (PL), diffuse reflectance spectra (DRS), the low-temperature emission spectrum and the luminescence decay curve. The sample doped with 8.78 mol% Mn4+ exhibits an intense red emission with a high thermal stability and appropriate CIE coordinates (x = 0.69, y = 0.31), and its emission intensity is higher than that of commercial K2TiF6:Mn4+. The white light-emitting diodes (WLEDs) fabricated with this sample exhibit intense warm white-light with a low color temperature (T-c = 3673 K), high color rendering index (R-a = 84.9) and high luminous efficacy (LE = 141.5 lm W-1). So Cs2GeF6:Mn4+ may be a promising red component for warm WLEDs.
机译:通过阳离子交换法合成了红色荧光粉Cs2GeF6:Mn4 +。制备的磷光体通过X射线衍射(XRD),扫描电子显微镜(SEM),能量色散X射线光谱仪(EDS),原子吸收分光光度计(AAS),热重分析(TG)和差示扫描量热法( DSC)。通过光致发光光谱(PL),漫反射光谱(DRS),低温发射光谱和发光衰减曲线研究了其光学性质。掺杂有8.78 mol%Mn4 +的样品表现出强烈的红色发射,具有高的热稳定性和适当的CIE坐标(x = 0.69,y = 0.31),并且其发射强度高于商业K2TiF6:Mn4 +。用该样品制造的白光发光二极管(WLED)表现出强烈的暖白光,色温低(Tc = 3673 K),显色指数高(Ra = 84.9),发光效率高(LE = 141.5 lm W) -1)。因此,Cs2GeF6:Mn4 +可能是温暖的WLED的有希望的红色成分。

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