兩種球型熒光粉的研究及LED發(fā)光模擬
發(fā)布時間：2018-07-23 13:22
【摘要】：白光LED照明技術因其具有節(jié)能、安全穩(wěn)定、環(huán)保和使用壽命長等特點,被稱為繼白熾燈、節(jié)能燈之后的新一代綠色照明光源。本文對白光LED的發(fā)展現(xiàn)狀,發(fā)光機理,制備方法以及常用的熒光粉表征手段進行了綜述。對白光LED的實現(xiàn)方式——用GaInN藍光芯片激發(fā)黃色熒光粉或GaInN藍光芯片激發(fā)紅綠色熒光粉；用紫外、近紫外的芯片激發(fā)RGB三基色熒光粉；采用紅綠藍芯片組合發(fā)射白光等方式進行了分析比較,得出結論：發(fā)黃光的YAG:Ce3+熒光粉由于其制備方便、制作成本低是目前最易實現(xiàn)工業(yè)化生產的材料；而紅色熒光粉是目前最亟需的熒光材料,研究制備一種發(fā)光效率高、發(fā)光性能穩(wěn)定的紅色熒光粉對發(fā)光和顯示領域都有極大的積極作用。本論文采用高溫固相法制備了YAG:Ce3+熒光粉,并通過X射線衍射(XRD)、熒光光譜(PL)、掃描電子顯微鏡(SEM)等測試手段,對經固相反應法制備的YAG:Ce3+熒光粉樣品的材料特性與發(fā)光性能進行了表征。研究表明,通過高溫固相法可以制備出發(fā)光性能良好的Ce3+摻雜的YAG熒光粉,得到的材料形貌為球形,結晶性和分散性良好,發(fā)黃綠光。通過實驗確定了最佳反應時間,由對比得知樣品在反應溫度1500℃比在1350℃下發(fā)光強度更高,發(fā)光強度隨反應溫度升高而得到增強。利用水熱法制備了球型紅色熒光粉CaWO4:Sm3+,通過XRD、PL、SEM等測試手段,對其發(fā)光性能進行了表征。實驗研究了摻雜濃度、反應時間等條件的改變對于樣品的形貌以及發(fā)光性能的影響。通過不同摻雜濃度的對比實驗,可以發(fā)現(xiàn)Sm3+摻雜量為6%時CaWO4:Sm3+的發(fā)光性能最優(yōu),得到的產物其晶相為四方相的白鎢礦結構,具有良好的球形形貌,發(fā)射峰位置為647nm發(fā)紅光。最后通過ZEMAX軟件對白光LED的發(fā)光進行了模擬,更好的了解LED的工作原理和光學特性。
[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，
本文編號：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，
本文編號：2139540
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