两种球型荧光粉的研究及LED发光模拟
发布时间：2018-07-23 13:22
【摘要】：白光LED照明技术因其具有节能、安全稳定、环保和使用寿命长等特点,被称为继白炽灯、节能灯之后的新一代绿色照明光源。本文对白光LED的发展现状,发光机理,制备方法以及常用的荧光粉表征手段进行了综述。对白光LED的实现方式——用GaInN蓝光芯片激发黄色荧光粉或GaInN蓝光芯片激发红绿色荧光粉；用紫外、近紫外的芯片激发RGB三基色荧光粉；采用红绿蓝芯片组合发射白光等方式进行了分析比较,得出结论：发黄光的YAG:Ce3+荧光粉由于其制备方便、制作成本低是目前最易实现工业化生产的材料；而红色荧光粉是目前最亟需的荧光材料,研究制备一种发光效率高、发光性能稳定的红色荧光粉对发光和显示领域都有极大的积极作用。本论文采用高温固相法制备了YAG:Ce3+荧光粉,并通过X射线衍射(XRD)、荧光光谱(PL)、扫描电子显微镜(SEM)等测试手段,对经固相反应法制备的YAG:Ce3+荧光粉样品的材料特性与发光性能进行了表征。研究表明,通过高温固相法可以制备出发光性能良好的Ce3+掺杂的YAG荧光粉,得到的材料形貌为球形,结晶性和分散性良好,发黄绿光。通过实验确定了最佳反应时间,由对比得知样品在反应温度1500℃比在1350℃下发光强度更高,发光强度随反应温度升高而得到增强。利用水热法制备了球型红色荧光粉CaWO4:Sm3+,通过XRD、PL、SEM等测试手段,对其发光性能进行了表征。实验研究了掺杂浓度、反应时间等条件的改变对于样品的形貌以及发光性能的影响。通过不同掺杂浓度的对比实验,可以发现Sm3+掺杂量为6%时CaWO4:Sm3+的发光性能最优,得到的产物其晶相为四方相的白钨矿结构,具有良好的球形形貌,发射峰位置为647nm发红光。最后通过ZEMAX软件对白光LED的发光进行了模拟,更好的了解LED的工作原理和光学特性。
[Abstract]:White light LED lighting technology is called a new generation green lighting source after incandescent lamp and energy saving lamp because of its characteristics of energy saving, safety and stability, environmental protection and long service life. In this paper, the development of white LED, luminescence mechanism, preparation methods and common methods of characterization of phosphors are reviewed. The way to realize white LED is to use GaInN blue chip to excite yellow phosphor or GaInN blue chip to excite red and green phosphor, to use ultraviolet, near ultraviolet chip to excite RGB tricolor phosphor. By using the combination of red, green and blue chips to emit white light, it is concluded that the yellowish YAG:Ce3 phosphors are the most convenient materials for industrial production because of their convenient preparation and low production cost. Red phosphors are the most needed fluorescent materials at present. The preparation of a kind of red phosphors with high luminescence efficiency and stable luminescence performance has a great positive effect on the luminescence and display fields. In this paper, YAG:Ce3 phosphors were prepared by high temperature solid state method. X-ray diffraction (XRD) (XRD), fluorescence spectrum (PL),) scanning electron microscope (SEM) was used to measure the phosphors. The properties and luminescence properties of YAG:Ce3 phosphors prepared by solid state reaction were characterized. The results show that Ce3 doped YAG phosphors with good luminescence properties can be prepared by high temperature solid state method. The obtained YAG phosphors have spherical morphology, good crystallinity and dispersion, and yellowish green. The optimum reaction time was determined by experiments. The results showed that the luminescence intensity of the sample was higher at 1500 鈩，
本文编号：2139540
[Abstract]:White light LED lighting technology is called a new generation green lighting source after incandescent lamp and energy saving lamp because of its characteristics of energy saving, safety and stability, environmental protection and long service life. In this paper, the development of white LED, luminescence mechanism, preparation methods and common methods of characterization of phosphors are reviewed. The way to realize white LED is to use GaInN blue chip to excite yellow phosphor or GaInN blue chip to excite red and green phosphor, to use ultraviolet, near ultraviolet chip to excite RGB tricolor phosphor. By using the combination of red, green and blue chips to emit white light, it is concluded that the yellowish YAG:Ce3 phosphors are the most convenient materials for industrial production because of their convenient preparation and low production cost. Red phosphors are the most needed fluorescent materials at present. The preparation of a kind of red phosphors with high luminescence efficiency and stable luminescence performance has a great positive effect on the luminescence and display fields. In this paper, YAG:Ce3 phosphors were prepared by high temperature solid state method. X-ray diffraction (XRD) (XRD), fluorescence spectrum (PL),) scanning electron microscope (SEM) was used to measure the phosphors. The properties and luminescence properties of YAG:Ce3 phosphors prepared by solid state reaction were characterized. The results show that Ce3 doped YAG phosphors with good luminescence properties can be prepared by high temperature solid state method. The obtained YAG phosphors have spherical morphology, good crystallinity and dispersion, and yellowish green. The optimum reaction time was determined by experiments. The results showed that the luminescence intensity of the sample was higher at 1500 鈩，
本文编号：2139540
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