目錄
摘要 I
Abstract II
1 引言 1
1.1 玻璃陶瓷的概念和應(yīng)用 1
1.2 白光LED的發(fā)展 1
1.3 白光LED用熒光粉合成的現(xiàn)狀 2
1.4 本課題的研究意義和內(nèi)容 2
2 實驗過程 4
2.1 實驗試劑和設(shè)備 4
2.1.1 實驗試劑 4
2.1.2 實驗設(shè)備 4
2.2 溶膠-凝膠法制備熒光粉 5
2.2.1 樣品的成分計算和分組 5
2.2.2溶解樣品 5
2.2.3 在氧化鎵溶液中加入稀土離子和六水合氯化鎂 6
2.2.4 調(diào)節(jié)PH值 6
2.2.5 溶膠 6
2.2.6 室溫凝膠 6
2.2.7 樣品烘干 6
2.2.8 退火處理 7
2.3 樣品檢測 7
2.3.1 XRD檢測 7
2.3.2 熒光光譜檢測 7
3、結(jié)果與討論 8
3.1 XRD結(jié)果分析 8
3.2 MgO-Ga2O3-SiO2:Eu3+的熒光光譜分析 10
3.3 MgO–Ga2O3–SiO2:Dy3+的光譜分析 14
4、結(jié)論 18
參考文獻 19
致謝 21










白光LED用納米玻璃的合成和光譜特性

摘要
MgGa2O4既是一種有重要應(yīng)用價值的新型藍色熒光體，又是一種適合稀土摻雜的發(fā)光基質(zhì)。本文通過溶膠-凝膠法對其摻雜稀土離子(Eu3+，Dy3+)從而合成新型的復(fù)合發(fā)光材料，并研究在不同的MgO-Ga2O3配比和不同的溫度（700 oC，800 oC，900 oC）下此材料的晶化能力和發(fā)光強度，分析對比從而獲得最佳方法。通過對樣品進行XRD分析和熒光光譜分析，發(fā)現(xiàn)隨著MgO-Ga2O3量的增加和溫度的升高，樣品晶化能力變強，形成的MgGa2O4納米晶將稀土離子稀釋，從而經(jīng)歷了濃度猝滅、解猝滅和稀釋的過程，發(fā)光強度相應(yīng)經(jīng)歷弱-強-弱的變化。通過對比分析，在MgO-Ga2O3-SiO2中摻雜稀土離子Eu3+的最佳配比為2MgO-2Ga2O3-96SiO2:Eu3+，其在395 nm激發(fā)下發(fā)出強烈的單色紅光。而摻雜稀土離子Dy3+的最佳配比為5MgO-5Ga2O3-90SiO2:Dy3+，其在在350 nm激發(fā)下能發(fā)出強烈的藍光(487 nm)和黃光(578 nm)，通過調(diào)節(jié)可實現(xiàn)白光發(fā)射。而且這兩種配比在350 nm激發(fā)下都比240nm的強。這表明，氧化物玻璃中摻雜稀土離子發(fā)光材料的研究在白光LED領(lǐng)域具有十分重要的作用和意義。
關(guān)鍵詞：玻璃陶瓷；稀土摻雜；溶膠凝膠；晶化能力；發(fā)光強度；最佳配比

White LED synthesis with nano glass and the spectral characteristics
Abstract
MgGa2O4 is not only a new blue fluorescent with great value, but also a suitable rare earth doped luminous matrix. In this paper, the rare earth ions (Dy3+,Eu3+)-doped MgO-Ga2O3-SiO2 glass-ceramic was prepared by sol–gel method to Synthesis new type of composite light-emitting materials, and studied in at different MgO- Ga2O3 ratio and different temperatures (700 oC，800 oC，900 oC) the crystallization ability and the luminous intensity of this material , analysis and comparison to get the best methods. The samples were analyzed by means of XRD and fluorescence spectroscopy, found that with the increasing in the amount of MgO-Ga2O3 and the heat treatment temperature, the crystalline ability of samples was increased. As MgGa2O4 nanocrystalline increase, resulting in the rare earth ions was relatively diluted. The rare earth ions experienced a concentration quenching, the solution of quenching and dilution process, and the luminous intensity corresponding to experience weak-strong-weak change. Through comparative analysis, the best compositions of samples doped with Eu3+ were: 2MgO-2Ga2O3-96SiO2:Eu3+, it can emit a very strong pure red(626nm) light under the excitation of 395nm ;and 5MgO-5Ga2O3-90SiO2:Dy3+,which can emit stronger blue (487 nm) and yellow ( 578 nm ) light, and white light emission can be achieved by adjusting the composition.and both these two samples emit at 350 nm stronger then 280nm. which shows the MgO–Ga2O3–SiO2 doped with rare earth ions have the potentiality to be used into the field of white light LEDs applications.
Keywords: Glass-ceramic; Rare earth doped; Sol-gel; Crystallization ability; Luminous intensity; Best-consist