本文選題：熒光粉　切入點(diǎn)：Ca_(0.75)Sr_(0.2)Mg_(1.05)(Si_2O_6)　出處：《河北大學(xué)》2017年碩士論文

【摘要】：本文以 Ca0.75Sr0.2Mg1.05(Si2O6)(CSMS)和 Ba2Ca(PO4)2(BCPO)為基質(zhì),利用傳統(tǒng)的高溫固相法制備了一系列新的 CSMS、CSMS:Eu2+,Mn2+、Ba2Ca1-xMx(PO4)2:Eu2+(M=Mg,Sr,Zn)等熒光發(fā)光材料。對(duì)基質(zhì)晶格的缺陷發(fā)光,基質(zhì)與摻雜離子間、摻雜離子與摻雜離子間的能量傳遞,多陽(yáng)離子取代造成的熒光發(fā)射光譜反向紅藍(lán)移以及溫度光譜的能量反傳遞等現(xiàn)象進(jìn)行了細(xì)致地研究與討論:(1)Ca0.75Sr0.2Mg1.05(Si2O6)基質(zhì)熒光材料在高溫固相還原反應(yīng)下合成,并從晶體結(jié)構(gòu)、基質(zhì)激發(fā)的發(fā)光過(guò)程、溫度特性曲線等方面對(duì)基質(zhì)的缺陷發(fā)光進(jìn)行了細(xì)致地分析。該基質(zhì)在紫外燈的照射下呈現(xiàn)為橘黃色,通過(guò)熒光光譜測(cè)量,CSMS基質(zhì)的發(fā)射帶有兩個(gè)明顯的發(fā)射峰,分別位于453 nm和580 nm,波長(zhǎng)大致在350 nm-800 nm范圍內(nèi)。監(jiān)測(cè)基質(zhì)的溫度特性,可以看到,隨著溫度的上升,發(fā)射光譜出現(xiàn)不同程度的藍(lán)移、紅移和強(qiáng)度變化。(2)利用高溫固相法,制備了顏色可調(diào)型Ca0.75-xSr0.2Mg1.05-y(Si2O6):xEu2+,yMn2+熒光粉。文中詳細(xì)分析了材料的熒光光譜、色坐標(biāo)、量子效率、熱釋光譜、漫反射光譜、熒光壽命衰減曲線。對(duì)CSMS:xEu2+,半峰寬為41nm,發(fā)射波長(zhǎng)為200-450 nm,發(fā)射主峰在453 nm,大量子效率可達(dá)66.08%,色坐標(biāo)為(0.1451,0.0736),屬于典型的藍(lán)光發(fā)射。對(duì)CSMS:yMn2+熒光粉,激發(fā)波長(zhǎng)為415nm,發(fā)射主峰為680 nm,呈淺紅色。對(duì) Ca0.75-xSr0.2Mg1.05-y(Si2O6):xEu2+,yMn2+樣品,證明了 Eu2+→Mn2+,Eu2+→基質(zhì),基質(zhì)→Mn2+間的能量傳遞關(guān)系,使CSMS:0.03Eu2+,0.02Mn2+熒光粉呈現(xiàn)藍(lán)白光發(fā)射,色坐標(biāo)為(0.2682,0.2056)。(3)通過(guò)在Eu2+激活的Ba2Ca(PO4)2基質(zhì)中引入新的陽(yáng)離子(Mg,Sr,Zn),制備了一系列Ba2Ca1-xMx(PO4)2:Eu2+(M=Mg,Sr,Zn)新型熒光粉。文中,對(duì)基質(zhì)中組分中含有不只一個(gè)陽(yáng)離子的基質(zhì)提出了一種摻雜離子(Eu2+)“直接取代和間接取代”的新機(jī)理,同時(shí)對(duì)具有多個(gè)發(fā)光中心的基質(zhì)提出了“選擇激發(fā)”的概念。隨著樣品顏色從藍(lán)色到黃色的調(diào)控,在Ba2Ca1-xMgx(PO4)2:Eu2+體系的發(fā)射光譜中觀測(cè)到了反常的紅移現(xiàn)象(479→602 nm),而在Ba2Ca1-ySry(PO4)2:Eu2+體系中,觀測(cè)到光譜的發(fā)射主波長(zhǎng)向短波方向移動(dòng)(485→441 nm)。對(duì)Ba2Ca1-zZnz(PO4)2:Eu2+,激發(fā)在355 nm時(shí),光譜先藍(lán)移,然后紅移;當(dāng)激發(fā)為400 nm時(shí),光譜連續(xù)紅移。此外,當(dāng)引入一種新的陽(yáng)離子時(shí)較大比例的改變基質(zhì)組分時(shí),文中認(rèn)為新基質(zhì)合成的的過(guò)程中大體上會(huì)經(jīng)過(guò)三種物態(tài)的存在方式:固溶體態(tài)、混合物態(tài)、新物質(zhì)。對(duì)Ba2Ca1-zZnz(PO4)2:Eu2+(y=0.7,0.8,09),隨溫度升高,譜型開(kāi)始轉(zhuǎn)變。通過(guò)對(duì)該系列光譜的進(jìn)行高斯分峰擬合,證明了在不同的Eu2+的發(fā)光中心存在能量傳遞以及熱釋能量的反向傳遞的現(xiàn)象。最后,本文用實(shí)驗(yàn)制備的 Ba2Ca0.7Mg0.3(PO4)2:Eu2+和 Ba2Ca0.3Sr0.7(PO4)2:Eu2+樣品輔以380 nm的LED芯片進(jìn)行封裝,得暖白光發(fā)射。
[Abstract]:Using Ca0.75Sr0.2Mg1.05Si2O6 (CSMSS) and Ba2CaOPO4O2BCPO) as substrates, a series of new luminescent materials, such as CSMS: CSMS: EU2, Mn2, Ba2Ca1-xMxPO4, EU2: EU2MMgSrOZnZn), have been prepared by conventional high temperature solid state method. The luminescence of the matrix crystal lattice, the luminescence between the substrate and the doped ions, and so on, have been studied. The energy transfer between doped ions and doped ions, The reverse red-blue shift of fluorescence emission spectrum caused by polycation substitution and the energy back transfer of temperature spectrum were studied and discussed in detail. The synthesis of the fluorescent matrix material of 1: 1 Ca-0.75Sr0.2Mg1.05Si2O6) was carried out under the solid state reduction reaction at high temperature, and the structure of the substrate was obtained from the crystal structure. The luminescence process induced by the substrate, temperature characteristic curve and so on, were analyzed in detail. The luminescence of the substrate was orange under the irradiation of ultraviolet lamp. Fluorescence spectra were used to measure the emission of CSMS matrix with two distinct emission peaks, located at 453nm and 580nm, respectively, and the wavelength was approximately 350 nm-800 nm. Monitoring the temperature characteristics of the substrate, we can see that with the increase of temperature, Blue shift, red shift and intensity change of emission spectra.) the color adjustable Ca0.75-xSr0.2Mg1.05-y(Si2O6):xEu2 yMn2 phosphors were prepared by high temperature solid state method. The fluorescence spectra, chromatic coordinates, quantum efficiency and thermoluminescence spectra of the phosphors were analyzed in detail. Diffuse reflectance spectrum, fluorescence lifetime attenuation curve. For CSMS:xEu2, the half peak width is 41 nm, the emission wavelength is 200-450 nm, the main emission peak is 453 nm, the mass efficiency can reach 66.08 and the color coordinate is 0.1451 ~ 0.0736, which belongs to the typical blue emission. The excitation wavelength is 415nm, the main emission peak is 680nm, which is light red. For the sample of Ca0.75-xSr0.2Mg1.05-y(Si2O6):xEu2 yMn2, it is proved that Eu2. 鈫扢n2 ,Eu2. 鈫扢atrix. 鈫扵he energy transfer relationship between Mn2 makes CSMS:0.03Eu2 _ (0.02Mn _ 2) phosphors appear blue and white emission. The color coordinate is 0.2682 ~ 0.2056 ~ (5).) A series of new phosphors of Ba2Ca1-xMx(PO4)2:Eu2 _ (M _ (M)) _ (mg ~ (2 +)) SrZn) have been prepared by introducing a new cationic cation (Eu2) to the Ba2Ca(PO4)2 substrate activated by Eu2. A new mechanism of "direct substitution and indirect substitution" was proposed for the matrix containing more than one cation in the matrix. At the same time, the concept of "selective excitation" was proposed for the matrix with multiple luminous centers. With the regulation of the color of the sample from blue to yellow, the abnormal red-shift phenomenon was observed in the emission spectra of the Ba2Ca1-xMgx(PO4)2:Eu2 system. 鈫捍n the Ba2Ca1-ySry(PO4)2:Eu2 system, the main emission wavelength of the spectrum moved towards the shortwave direction. 鈫扚or Ba2Ca1-zZnz(PO4)2:Eu2, when excited at 355nm, the spectrum shifts first to blue, then to red; when excited to 400nm, the spectrum continuously redshifts. In addition, when a new cation is introduced, a large proportion of the matrix components are changed. In this paper, it is considered that there are three kinds of physical states in the process of synthesis of new substrates: solid solution state, mixture state, new substance. The spectral pattern is beginning to change. By fitting the spectrum with Gao Si, it is proved that there is energy transfer and reverse transfer of thermoluminescence energy in different Eu2 luminescence centers. In this paper, the experimental Ba2Ca0.7Mg0.3(PO4)2:Eu2 and Ba2Ca0.3Sr0.7(PO4)2:Eu2 samples were encapsulated with a 380nm LED chip to obtain warm white light emission.
【學(xué)位授予單位】：河北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ422;TN312.8

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本文編號(hào)：1664853