本文選題：白光LED + 熒光粉��； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：為控制全球溫室氣體排放,節(jié)約消耗能源,近年來各國制定能源政策的同時,競相提出“節(jié)能減碳”計劃,其中澳洲、歐盟以及美國加州等已陸續(xù)宣布淘汰白熾燈作為照明設(shè)施。隨著半導(dǎo)體發(fā)光技術(shù)的發(fā)展,LED以其高效、節(jié)能、環(huán)保等顯著優(yōu)點,在照明、顯示等領(lǐng)域得到了廣泛應(yīng)用,對節(jié)能減排具有重要的意義。實現(xiàn)白光LED的途徑有多種,就技術(shù)水平和制造成本而言,目前使用最為普遍最成熟的一種是藍光LED芯片覆蓋一層摻鈰釔鋁石榴石黃色熒光粉(YAG:Ce),使藍光和黃光混合得到白光。熒光粉是實現(xiàn)白光LED的關(guān)鍵環(huán)節(jié)之一,熒光粉作為半導(dǎo)體照明技術(shù)中的關(guān)鍵材料之一,它的品質(zhì)直接影響著白光LED的發(fā)光亮度、光效、顯色指數(shù)、色溫、光衰及壽命等性能。目前白光LED用摻鈰釔鋁石榴石黃色熒光粉(YAG:Ce)的制備方法主要有高溫固相燒結(jié)法、液相化學(xué)共沉淀法、水熱法、溶膠凝膠法、Pechini膠體法、微乳液法、燃燒法、微波法等。本論文綜述了幾種制備方法,總結(jié)了它們的優(yōu)缺點,并重點對液相沉淀法進行了研究。研究了液相沉淀法中各個工藝條件對熒光粉性能的影響,探討了稀土摻雜對熒光粉結(jié)構(gòu)和發(fā)光性能的影響,并對熒光粉體進行了包覆處理實驗。主要研究內(nèi)容如下:(1)綜述白光LED用熒光粉的種類、制備方法,分析各種類和方法的優(yōu)缺點;(2)液相共沉淀法制備合格的前驅(qū)體,包括原材料的選定、沉淀劑和表面活性劑的選擇、溶液濃度的標(biāo)定、沉淀和陳化的條件等;(3)一次煅燒:煅燒溫度的選擇、煅燒時間的選擇、助熔劑的選擇、最佳鈰摻雜濃度;(4)二次還原:利用氫氣的還原性將晶體中的Ce4+離子還原為Ce3+,目的是提高熒光粉的發(fā)光效率;(5)包覆處理:在熒光粉顆粒表面形成一層二氧化硅包覆層,從而提高成品的發(fā)光性能和使用壽命;(6)封裝實驗:用實驗制備的YAG:Ce熒光粉與藍光LED芯片配合封裝出1W的白光LED器件,并組裝成LED球泡燈,以綜合檢測熒光粉的性能指標(biāo)。上述研究用液相沉淀法制備了YAG:Ce熒光粉,作了有意義的研究和實驗,為進一步的研究提供了理論依據(jù)。
[Abstract]:In order to control global greenhouse gas emissions and save energy consumption, in recent years, when countries have formulated energy policies, they have been competing to put forward plans to "save energy and reduce carbon", among which Australia, The European Union and California have announced that incandescent lamps have been phased out as lighting facilities. With the development of semiconductor light-emitting technology, LED has been widely used in lighting, display and other fields with its advantages of high efficiency, energy saving, environmental protection and so on, which is of great significance to energy saving and emission reduction. There are many ways to realize white LED. At present, one of the most widely used LED chips is the blue LED chip with a layer of yttrium aluminum garnet yellow phosphor, which makes the mixture of blue light and yellow light get white light. Phosphor is one of the key links in the realization of white LED. As one of the key materials in semiconductor lighting technology, the quality of phosphor directly affects the luminance, luminous effect, color index, color temperature, light decay and lifetime of white LED. At present, the preparation methods of yttrium aluminum garnet yellow phosphor with cerium doped yttrium aluminum garnet for white LED are high temperature solid state sintering, liquid phase chemical coprecipitation, hydrothermal method, sol-gel method, microemulsion method, combustion method, microwave method and so on. In this paper, several preparation methods are reviewed, their advantages and disadvantages are summarized, and the liquid precipitation method is studied. The effects of different processing conditions on the phosphor properties were studied. The effects of rare earth doping on the phosphor structure and luminescence properties were discussed. The coating experiments were carried out on the phosphors. The main research contents are as follows: (1) A review of the types and preparation methods of phosphors for white LED, and analysis of the advantages and disadvantages of various types and methods) the preparation of qualified precursors by liquid phase coprecipitation, including the selection of raw materials, the selection of precipitators and surfactants, Determination of solution concentration, conditions of precipitation and aging, etc.) single calcinations: selection of calcination temperature, selection of calcination time, selection of flux, The optimum concentration of cerium doped is 4) secondary reduction: the Ce4 ion in the crystal is reduced to Ce3 by hydrogen reduction, the aim is to improve the luminescence efficiency of the phosphor and the coating treatment: to form a layer of silica coating on the surface of the phosphor particle, so as to improve the luminescence efficiency of the phosphor and form a layer of silica coating layer on the surface of the phosphor particle. So as to improve the luminous property and service life of the finished product, the packaging experiment: the YAG:Ce phosphor fabricated by the experiment was combined with the blue LED chip to package a white LED device with 1W and assembled into a LED bulb lamp to comprehensively test the performance index of the phosphor. In this study, YAG:Ce phosphors were prepared by liquid-phase precipitation method, and the experimental results provided a theoretical basis for further study.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN312.8

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本文編號：1779001