發(fā)布時間：2018-11-16 15:29

【摘要】：稀土轉(zhuǎn)光劑是一種具有光轉(zhuǎn)換能力的新型功能材料,可以廣泛應(yīng)用于光纖通訊、農(nóng)用薄膜、生物分析傳感器及激光技術(shù)等領(lǐng)域。稀土銪(Eu)元素在光、電、磁等方面的性能突出,被廣泛應(yīng)用于稀土轉(zhuǎn)光劑制備中;但銪的價格昂貴,且其發(fā)射光譜單一,與植物光合作用匹配度不高,不適合在農(nóng)膜中廣泛應(yīng)用。本文以稀土銪、釤(Sm)為中心,A1203、H3BO3為基質(zhì),合成了稀土無機轉(zhuǎn)光劑;以稀土銪為中心,摻雜釤、釔(Y)等其它低價格稀土離子和水楊酸(Hsal)、鄰菲羅啉(Phen)有機配體,合成了一系列稀土有機配合物轉(zhuǎn)光劑,并成功制備聚乙烯轉(zhuǎn)光膜,主要研究內(nèi)容如下:1)稀土無機轉(zhuǎn)光劑。采用高溫固相法合成Al18B4033:Sm3+、Al18B4033:Eu3+稀土無機轉(zhuǎn)光劑,用X射線衍射、熒光光譜和粒度和粒徑分布對其進行表征。當反應(yīng)原料中 n(Al) / n(B) =4.5:1 時,Al18B4O33:Sm3+轉(zhuǎn)光劑可以由 200-400 nm的光激發(fā),發(fā)射波長為580-710nm的紅光,其最強熒光強度為735 (a.u.),熒光強度較弱;Al18B4033:Eu3+轉(zhuǎn)光劑可以由200-500 nm的光激發(fā),發(fā)射波長為585-720 nm的特征紅光,其熒光強度為3032 (a.u.),明顯優(yōu)于Al18B4033:Sm3+稀土無機轉(zhuǎn)光劑的熒光強度,但低于雙稀土有機配合物轉(zhuǎn)光劑的熒光強度。2)雙稀土有機配合物轉(zhuǎn)光劑。以低成本釤、釔(Y)部分分別取代高價格銪合成與植物吸收光譜更匹配的雙稀土有機配合物轉(zhuǎn)光劑EuxSm1-x(Hsal)3Phen、EuxY1-x(Hsal)3Phen。用X射線光電子能譜、紅外光譜、熒光光譜、熱失重、粒度和粒徑分布對轉(zhuǎn)光劑進行表征。EuxSm1-x(Hsal)3Phen轉(zhuǎn)光劑在394 nm紫光處和465 nm藍綠光處的激發(fā)峰強度達到最大值;當Sm3+的摩爾用量為70 %時,轉(zhuǎn)光劑Eu0.3Sm0.7(Hsal)3Phen在646 nm處發(fā)射峰強度達到最大值,646 nm處的發(fā)射光與植物吸收光譜吻合性好。當Y3+的摩爾用量為70 %時,轉(zhuǎn)光劑Eu0.3Y0.7(Hsal)3Phen在200-465 nm處激發(fā)光譜強度達到最大值,在585-665 nm處發(fā)射光譜強度達到最大值,轉(zhuǎn)光性能良好。3) 轉(zhuǎn)光膜的制備。選取 Eu(Hsal)3Phen、Eu0.9Sm0.1(Hsal)3Phen、Eu0.6Sm0.4(Hsal)3Phen、Eu0.5Sm0.5(Hsal)3Phen、Eu0.5Y0.5(Hsal)3Phen、Eu0.2Y0.8(Hsal)3Phen和Eu0.1Y0.9(Hsal)3Phen轉(zhuǎn)光劑分別加入低密度聚乙烯,制備轉(zhuǎn)光膜。用熒光光譜儀對轉(zhuǎn)光膜的熒光性能進行表征。結(jié)果表明,所得到的轉(zhuǎn)光膜可以將太陽中的紫外光和紫光轉(zhuǎn)化為植物光合作用所需的紅光。
[Abstract]:Rare earth optical conversion agent is a new functional material with optical conversion ability. It can be widely used in optical fiber communication, agricultural film, biosensor and laser technology. The rare earth europium (Eu) is widely used in the preparation of rare earth conversion agent because of its outstanding properties in light, electricity and magnetism. However, europium is not suitable for wide application in agricultural film because of its high price, single emission spectrum and poor matching with plant photosynthesis. In this paper, rare earth inorganic optical conversion agent was synthesized with rare earth europium, samarium (Sm) as the center and A1203H3BO3 as the matrix. A series of rare earth organic complexes have been synthesized with rare earth europium as the center, doped with other low price rare earth ions such as samarium, yttrium (Y) and (Hsal), o-phenanthroline salicylate (Phen) organic ligands, and polyethylene photoconversion films have been successfully prepared. The main research contents are as follows: 1) rare earth inorganic light transfer agent. Al18B4033:Sm3 and Al18B4033:Eu3 rare earth inorganic transmitters were synthesized by high temperature solid state method and characterized by X-ray diffraction, fluorescence spectra, particle size and particle size distribution. When n (Al) / n (B) = 4.5: 1, the conversion agent of Al18B4O33:Sm3 can be excited by 200-400 nm, emitting red light at the wavelength of 580-710nm, the strongest fluorescence intensity is 735 (a.u.), and the fluorescence intensity is weak. The fluorescence intensity of Al18B4033:Eu3 conversion agent is 3032 (a.u.), which is obviously better than that of Al18B4033:Sm3 rare earth inorganic conversion agent, which can be excited by 200-500 nm, and the emission wavelength is 585-720 nm, and its fluorescence intensity is 3032 (a.u.). But it is lower than the fluorescence intensity of the light conversion agent of the double rare earth organic complex. 2) the light transfer agent of the double rare earth organic complex. Low-cost samarium and yttrium (Y) were used to replace the high price europium in the synthesis of EuxSm1-x (Hsal) _ 3Pheno _ (EU _ XY _ (1-x) (Hsal) _ (3) Phen), which is more suitable for plant absorption spectra. X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (IR), fluorescence spectrum, thermogravimetric analysis, particle size and particle size distribution were used to characterize the transmitters. The intensity of excitation peaks of EuxSm1-x (Hsal) 3Phen transmitters at 394 nm violet and 465 nm blue-green light reached the maximum. When the molar amount of Sm3 was 70%, the emission peak intensity of Eu0.3Sm0.7 (Hsal) 3Phen reached the maximum at 646 nm, and the emission light at 646 nm coincided well with the plant absorption spectrum. When the molar content of Y3 is 70%, the excitation spectral intensity of Eu0.3Y0.7 (Hsal) 3Phen reaches the maximum at 200-465 nm and the emission intensity at 585-665 nm. 3) the optical conversion film is prepared. Eu (Hsal) 3Pheno Eu0.9Sm0.1 (Hsal) 3Pheno Eu0.6Sm0.4 (Hsal) 3Pheno Eu0.5Sm0.5 (Hsal) 3Pheno Eu0.5Y0.5 (Hsal) 3Phen. Low density polyethylene (LDPE) was added to Eu0.2Y0.8 (Hsal) 3Phen and Eu0.1Y0.9 (Hsal) 3Phen to prepare the conversion film. The fluorescence properties of the film were characterized by fluorescence spectrometer. The results show that the UV and UV light in the sun can be transformed into red light for plant photosynthesis.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O641.4

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