本文選題：鈰摻雜YAG熒光粉 + 分步滴定法　； 參考：《河南理工大學(xué)》2011年碩士論文

【摘要】：熒光粉經(jīng)過(guò)紫外/藍(lán)光發(fā)光二極管輻射轉(zhuǎn)換為發(fā)白光，業(yè)已證明LED加熒光粉是非常有前景的固體發(fā)光技術(shù)，也是未來(lái)極其重要的節(jié)能照明光源。白光發(fā)光二級(jí)管有節(jié)能、壽命長(zhǎng)、無(wú)汞的優(yōu)點(diǎn)。當(dāng)前的商業(yè)白光發(fā)光二極管顯示器是用涂覆YAG:Ce熒光粉制成的，由于4f1-5d1的電子躍遷，在YAG中的鈰離子能有效地吸收450nm到470nm的藍(lán)光并能發(fā)射510nm到超過(guò)600nm范圍的發(fā)光寬帶，這些光譜的性質(zhì)使YAG:Ce成為通過(guò)藍(lán)光輻射LED轉(zhuǎn)變?yōu)榘坠獾暮芎玫臒晒夥�。本論文的主要工作是以分步滴定法制備YAG：Ce熒光粉為研究目標(biāo)，優(yōu)化最佳工藝參數(shù)，并以此為基礎(chǔ)通過(guò)多元離子摻雜來(lái)實(shí)現(xiàn)白光LED不同色溫的調(diào)控。研究的主要內(nèi)容和結(jié)論如下： (1)采用分步滴定法制備YAG:Ce黃色熒光粉，討論了沉淀劑、溶劑、分散劑、pH值、Ce摻雜濃度、煅燒溫度、煅燒時(shí)間、氣氛、助熔劑等對(duì)熒光粉各種性能的影響。 (2)采用多元離子共激活，對(duì)Gd~(3+)、Ga~(3+)、Pr~(3+)等取代YAG:Ce中的基質(zhì)元素進(jìn)行研究，結(jié)果表明，摻雜的稀土離子取代了YAG中部分Y3+或A1~(3+)，可以實(shí)現(xiàn)發(fā)射光譜峰值波長(zhǎng)發(fā)生紅移或藍(lán)移。 (3)由于在煅燒過(guò)程中加入助熔劑，導(dǎo)致生成的熒光粉中有雜質(zhì)出現(xiàn)，通過(guò)酸洗、干燥、研磨，提高了熒光粉的發(fā)光性能。 (4)通過(guò)對(duì)自制熒光粉和英特美熒光粉進(jìn)行封裝比較，找出與美國(guó)熒光粉進(jìn)行各性能的差距，為以后工作提供指導(dǎo)。 主要?jiǎng)?chuàng)新點(diǎn)： （1）采用分步滴定法工藝方法制備YAG熒光粉，在發(fā)光性能方面有很大的提高，與市面熒光粉發(fā)光性能相比較，其相對(duì)發(fā)光效率達(dá)到160%，已經(jīng)基本達(dá)到實(shí)用需求。 （2）通過(guò)對(duì)采用多元離子（Gd、La、Ga）共摻雜YAG:Ce熒光粉進(jìn)行深入研究，獲得了調(diào)控?zé)晒夥鄯逯挡ㄩL(zhǎng)的工藝方法，顯著的改善了熒光粉顯色性色差、紅光成分不足等問(wèn)題。 （3）通過(guò)對(duì)熒光粉進(jìn)行酸、堿清洗、研磨、分篩處理，進(jìn)一步改善了熒光粉的發(fā)光性能，，提高了熒光粉的穩(wěn)定性、可靠性及應(yīng)用性。
[Abstract]:Phosphors are converted into white light by ultraviolet / blue light emitting diodes. It has been proved that LED plus phosphor is a very promising solid-state luminescence technology, and it is also an important energy-saving lighting source in the future. White light emitting secondary tube has the advantages of energy saving, long life and no mercury. The current commercial white light-emitting diode displays are made from coated YAG:Ce phosphors. Because of the electronic transition of 4f1-5d1, cerium ions in YAG can effectively absorb the blue light from 450nm to 470nm and emit 510nm to luminescent broadband beyond 600nm. The properties of these spectra make YAG:Ce a good phosphor for the conversion of blue LED to white light. The main work of this thesis is to optimize the optimum technological parameters of preparing YAG:Ce phosphors by stepwise titration, and to realize the control of different color temperature of white LED by multi-ion doping. The main contents and conclusions of the study are as follows: YAG:Ce yellow phosphors were prepared by stepwise titration. The effects of precipitant, solvent and dispersant pH value ce doping concentration, calcination temperature, calcination time, atmosphere and flux on the properties of phosphors were discussed. In this paper, the matrix elements in the substitution of YAG:Ce by Gd~(3 (Gd~(3) are studied by multicomponent ion co-activation. The results show that the doped rare earth ions can replace some of the Y _ 3 or A _ (1) O _ (3) in YAG, and the peak wavelength of the emission spectrum can be shifted red or blue. 3) due to the addition of flux in the calcination process, impurities appear in the phosphors produced, and the luminous properties of the phosphors are improved by acid washing, drying and grinding. 4) by comparing the self-made phosphors with the British phosphors, we can find out the difference between the self-made phosphors and the American phosphors and provide guidance for the future work. Major innovations: 1) the luminescent properties of YAG phosphors prepared by stepwise titration method have been greatly improved. Compared with the luminescent properties of phosphors in the market, the relative luminescence efficiency of the phosphors has reached 160%, which has basically reached the practical demand. 2) based on the in-depth study of co-doped YAG:Ce phosphors with multicomponent ions, the process of controlling the peak wavelength of phosphors has been obtained, which has improved the chrominance difference of phosphors and the shortage of red components, and so on. 3) through acid, alkali cleaning, grinding and screening treatment, the luminescent properties of phosphors are further improved, and the stability, reliability and application of phosphors are improved.
【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：O482.31

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