本文選題：銪摻雜氟化鑭 + 鋱摻雜氟化鑭��； 參考：《南昌大學(xué)》2015年碩士論文

【摘要】：近幾年,RE3+摻雜有機-無機雜化材料由于其良好的發(fā)光性能而得到廣泛的關(guān)注。在本論文中,主要制備了LaF3:Eu3+和LaF3:Tb3+納米發(fā)光材料以及它們的有機-無機雜化材料,并研究了其發(fā)光性能,具體內(nèi)容分以下三部分:(1)首先用水熱法合成了LaF3納米材料,接著用一種新的離子交換法合成Eu3+摻雜LaF3納米材料。之后,用苯甲酸(BA)和2-噻吩甲酰三氟丙酮(TTA)作為敏化劑包覆在LaF3:Eu3+納米粒子表面。XRD和TEM表征手段顯示所制備的LaF3納米材料為六方晶系LaF3,其形狀為六方納米片狀,直徑在25-40 nm之間,厚度約4-7 nm。FTIR顯示BA(或TTA)與稀土激活離子Eu3+形成有機配體。PL譜對不同Eu3+濃度、不同退火溫度及有機物的能量傳遞對LaF3:Eu3+發(fā)光性能的影響作出詳細的表述。結(jié)果表明,由于有機配體的能量傳遞,使BA(TTA)包覆LaF3:Eu3+納米材料的發(fā)光強度顯著提高。最后,討論了LaF3:Eu3+-BA和LaF3:Eu3+-TTA能量傳遞機理及有機配體提高發(fā)光強度的原因。(2)LaF3:Tb3+是一種重要的發(fā)綠光的納米材料。但由于其低的光學(xué)吸收,限制了發(fā)光性能。在本論文中,由于有機物的能量轉(zhuǎn)換,使形成的有機-無機雜化材料的發(fā)光性能得到提高。先用水熱法合成了LaF3納米材料,接著用離子交換法合成Tb3+摻雜LaF3納米材料,并以BA作為有機配體,包覆在LaF3:Tb3+納米粒子的表面。由于BA的能量傳遞,使LaF3:Tb3+-BA的發(fā)光性能有了顯著的提高,其發(fā)光強度是之前未包覆BA的LaF3:Tb3+的44倍之多。并對Tb3+離子的最佳摻雜濃度和BA的最佳包覆量做了具體的研究。(3)用水熱法一步合成LaF3:Eu3+納米材料,并同時用BA和TTA包覆LaF3:Eu3+納米材料,從而形成從200 nm-420 nm一個很寬的激發(fā)譜。
[Abstract]:In recent years, organic and inorganic hybrid materials doped with RE3 have received wide attention due to their good luminescence properties. In this thesis, LaF3:Eu3 and LaF3:Tb3 nano-luminescent materials and their organic-inorganic hybrid materials were prepared, and their luminescence properties were studied. The specific contents are as follows: 1) first, LaF3 nanomaterials were synthesized by hydrothermal method. Then Eu3 doped LaF3 nanomaterials were synthesized by a new ion exchange method. After that, LaF3:Eu3 nanoparticles were coated with benzoic acid and 2-thiophenyl trifluoroacetone as sensitizers. XRD and TEM characterization showed that the LaF3 nanocrystals were hexagonal LaF3 with a shape of hexagonal nanocrystals with diameters ranging from 25 to 40 nm. The thickness of 4-7 nm.FTIR shows that the effects of different Eu3 concentration, annealing temperature and energy transfer of organic compounds on the luminescence properties of LaF3:Eu3 are described in detail by the formation of organic ligand. PL spectra of BA- (or TTA-TTA) and rare earth activated ion Eu3. The results show that due to the energy transfer of organic ligands, the luminescence intensity of LaF3:Eu3 nanomaterials coated with Ba-TTA is improved significantly. Finally, the energy transfer mechanism of LaF3:Eu3 BA and LaF3:Eu3 TTA and the reason why organic ligands increase luminescence intensity are discussed. However, due to its low optical absorption, the luminescence performance is limited. In this thesis, the luminescence properties of organic-inorganic hybrid materials are improved due to the energy conversion of organic matter. LaF3 nanomaterials were synthesized by hydrothermal method and then Tb3 doped LaF3 nanomaterials were synthesized by ion exchange method. BA was used as organic ligand and coated on the surface of LaF3:Tb3 nanoparticles. Because of the energy transfer of BA, the luminescence performance of LaF3:Tb3-BA is greatly improved, and its luminescence intensity is 44 times as much as that of LaF3:Tb3 without BA. The optimum doping concentration of Tb3 ion and the optimum coating amount of BA were studied in detail. The LaF3:Eu3 nanomaterials were synthesized by hydrothermal method, and the LaF3:Eu3 nanomaterials were coated with BA and TTA at the same time, thus a wide excitation spectrum was formed from 200 nm-420 nm.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.1;TQ133.3

【參考文獻】

相關(guān)期刊論文 前1條

1 T.Grzyb;S.Lis;;Photoluminescent properties of LaF_3:Eu~(3+) and GdF_3:Eu~(3+)nanoparticles prepared by co-precipitation method[J];Journal of Rare Earths;2009年04期

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本文編號：1955692