發(fā)布時(shí)間：2018-04-21 01:12

  本文選題：微納米材料 + 上轉(zhuǎn)換��； 參考：《太原理工大學(xué)》2017年碩士論文

【摘要】：近年來,稀土離子摻雜的上轉(zhuǎn)換微納米發(fā)光材料由于其獨(dú)特的發(fā)光特性而被廣泛地應(yīng)用于激光、三維立體顯示、熒光標(biāo)簽、溫度傳感、生物標(biāo)記等領(lǐng)域,尤其在溫度傳感領(lǐng)域的研究與應(yīng)用更是備受研究者們的廣泛關(guān)注。目前,廣泛使用的溫度探測器件主要為傳統(tǒng)的基于熱接觸式的溫度測量設(shè)備。然而,在某些工作環(huán)境下,例如,強(qiáng)腐蝕性、電磁干擾環(huán)境下及微小快速移動(dòng)物體的溫度測量等,傳統(tǒng)溫度測量設(shè)備根本無法滿足準(zhǔn)確探測溫度的要求。但是,相較于傳統(tǒng)測量溫度的技術(shù),基于熒光強(qiáng)度峰值比的溫度傳感技術(shù)可以提供一種不受測量環(huán)境、分辨率和曝光時(shí)間等不同因素影響的溫度探測,從而保證了溫度探測的準(zhǔn)確性與精度。眾所周知,稀土離子具有豐富的能級結(jié)構(gòu)。當(dāng)相鄰能級間距較小時(shí),較高激發(fā)態(tài)能級通常可以被熱布局,從而表現(xiàn)出溫度依賴熒光發(fā)射強(qiáng)度的特性,因而可以用作光學(xué)溫度傳感材料。本文采用不同的化學(xué)方法合成了稀土離子摻雜的鈮酸鹽微納米材料,并對其上轉(zhuǎn)換發(fā)光機(jī)理和溫度傳感性質(zhì)進(jìn)行了詳細(xì)地研究。最終通過深入的理論分析,揭示了影響基于上轉(zhuǎn)換發(fā)光的光學(xué)溫度傳感靈敏度的主要因素。主要研究內(nèi)容如下:(1)采用熔鹽法首次合成了Yb~(3+)/Er~(3+)共摻的YNbO_4納米熒光粉。X射線衍射、掃描電鏡、透射電鏡及高分辨透射電鏡結(jié)果表明所合成熒光粉為單斜結(jié)構(gòu)的YNbO_4,且顆粒直徑約為35 nm。在980 nm激光的激發(fā)下,所制備的YNbO_4納米熒光粉表現(xiàn)出較強(qiáng)的上轉(zhuǎn)換發(fā)光強(qiáng)度。通過分析發(fā)光強(qiáng)度與激發(fā)功率之間的依賴關(guān)系,證實(shí)了綠色與紅色上轉(zhuǎn)換發(fā)光均為雙光子上轉(zhuǎn)換發(fā)光過程�；�于Er~(3+)離子的2H11/2/4S3/2兩個(gè)熱耦合綠光能級的熒光峰值比技術(shù)研究了YNbO_4納米熒光粉的光學(xué)溫度依賴性質(zhì),并且通過調(diào)節(jié)摻雜離子的濃度實(shí)現(xiàn)了熒光粉傳感靈敏度的調(diào)控,結(jié)果發(fā)現(xiàn):隨著Yb~(3+)摻雜濃度的增加,熒光粉的傳感靈敏度逐漸減小。同時(shí)觀察到:隨著溫度升高,上轉(zhuǎn)換納米熒光粉的發(fā)光顏色從黃色變成了綠色。(2)利用水熱法合成了一系列不同濃度的Yb~(3+)/Er~(3+)共摻的NaNbO_3微納米熒光粉,并研究了NaNbO_3:Yb~(3+)/Er~(3+)熒光粉的上轉(zhuǎn)換發(fā)光性質(zhì)與發(fā)光機(jī)理。X射線衍射及掃描電鏡結(jié)果證實(shí)制備的熒光粉為純相的NaNbO_3:Yb~(3+)/Er~(3+)熒光粉。上轉(zhuǎn)換熒光光譜結(jié)果表明:在980 nm激光泵浦下,共摻Y(jié)b~(3+)/Er~(3+)離子的熒光粉表現(xiàn)出較強(qiáng)的綠光與紅光發(fā)射,分別對應(yīng)著Er~(3+)離子2H11/2,4S3/2→4I15/2的躍遷與4F9/2→4I15/2的躍遷。發(fā)光強(qiáng)度的功率依賴特性證明綠色與紅色上轉(zhuǎn)換發(fā)光均為雙光子上轉(zhuǎn)換過程。另外,測量了不同溫度下的綠光上轉(zhuǎn)換熒光光譜,并研究了不同濃度下NaNbO_3熒光粉的溫度傳感靈敏特性,結(jié)果表明:Yb~(3+)摻雜濃度越低,傳感靈敏度越高。
[Abstract]:In recent years, rare-earth ion doped up-conversion micro-nano luminescent materials have been widely used in laser, three-dimensional display, fluorescent label, temperature sensing, biomarker and other fields due to their unique luminescence properties. Especially in the field of temperature sensing research and application is widely concerned by researchers. At present, the widely used temperature detector is mainly based on the traditional thermal contact temperature measuring equipment. However, in some working environments, such as strong corrosion, electromagnetic interference and temperature measurement of small and fast moving objects, the traditional temperature measurement equipment can not meet the requirements of accurate temperature detection. However, compared with the traditional temperature measurement technology, the temperature sensing technology based on the peak fluorescence intensity ratio can provide a temperature detection which is not affected by different factors, such as the measuring environment, the resolution and the exposure time, etc. Thus, the accuracy and accuracy of temperature detection are guaranteed. It is well known that rare earth ions have abundant energy level structures. When the distance between adjacent energy levels is small, the higher excited energy levels can usually be thermally distributed, thus showing the characteristics of temperature dependent fluorescence emission intensity, so they can be used as optical temperature sensing materials. In this paper, rare earth ions doped niobate nanocrystalline materials were synthesized by different chemical methods, and their up-conversion luminescence mechanism and temperature sensing properties were studied in detail. Finally, the main factors affecting the sensitivity of optical temperature sensing based on up-conversion luminescence are revealed by in-depth theoretical analysis. The main contents of this study are as follows: (1) the YNbO_4 nano-phosphors co-doped with Yb~(3 ~ (+ +) / Erton-3 were synthesized by molten salt method for the first time. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to prepare the YNbO_4 nano-phosphors. The results of transmission electron microscopy (TEM) and high resolution transmission electron microscopy (TEM) show that the synthesized phosphors are monoclinic YNbO _ s _ 4, and the particle diameter is about 35 nm. Under the excitation of 980nm laser, the YNbO_4 nanocrystalline phosphors exhibit strong up-conversion luminescence intensity. By analyzing the dependence between luminescence intensity and excitation power, it is proved that both green and red up-conversion luminescence are two-photon up-conversion luminescence processes. The optical temperature-dependent properties of YNbO_4 nanocrystalline phosphors were studied by using the fluorescence peak ratio technique of two thermally coupled green light levels of 2H11/2/4S3/2 based on Er~(3 ions, and the sensitivity of the phosphors was regulated by adjusting the concentration of doped ions. The results show that the sensitivity of phosphors decreases with the increase of doping concentration of Yb~(3. At the same time, it was observed that with the increase of temperature, the luminescence color of up-conversion nano-phosphors changed from yellow to green.) A series of NaNbO_3 microphosphors with different concentrations were synthesized by hydrothermal method. The upconversion luminescence properties and luminescence mechanism of NaNbO_3:Yb~(3 / Ern 3) phosphors have been studied. The results of X-ray diffraction and scanning electron microscopy show that the phosphors prepared are pure phase NaNbO_3:Yb~(3 / Erf3) phosphors. The upconversion fluorescence spectra show that the phosphors co-doped with Yb~(3 ~ + / er ~ (3) ~ (3) ions exhibit strong green and red emission, corresponding to the transition of 2H _ (11 / 2) S _ (3 / 2) 4I15/2 and 4F9/2 4I15/2, respectively, under the pump of 980nm laser. The power dependence of luminescence intensity shows that both green and red up-conversion luminescence are two-photon up-conversion processes. In addition, the up conversion fluorescence spectra of green light at different temperatures were measured, and the sensitive characteristics of temperature sensing of NaNbO_3 phosphors at different concentrations were studied. The results show that the lower the doping concentration is, the higher the sensing sensitivity is.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O482.31

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 鄭輝;相蘇原;陳寶玖;;利用Er~(3+)光學(xué)溫度傳感特性研究Tm~(3+)/Yb~(3+)摻雜NaY(WO_4)_2微米球的激光輻照熱效應(yīng)[J];發(fā)光學(xué)報(bào);2014年07期

2 閆磊,劉政威,陽效良;Er~(3+)/Yb~(3+)/Tm~(3+)共摻雜氟化物中紅色上轉(zhuǎn)換發(fā)光研究[J];光譜學(xué)與光譜分析;2005年06期

3 薛群基,徐康;納米化學(xué)[J];化學(xué)進(jìn)展;2000年04期

4 陳曉波,張光寅,李美仙,馮衍,侯延冰,郝昭,宋峰,王玉堂,付便翔,李明,胡仁元,孟廣政,孫寅官,宋增福;三維立體顯示——頻率上轉(zhuǎn)換研究的新進(jìn)展[J];光譜學(xué)與光譜分析;1998年03期

相關(guān)博士學(xué)位論文 前1條

1 田躍;稀土摻雜微納發(fā)光材料的生長機(jī)制與光譜學(xué)性質(zhì)研究[D];大連海事大學(xué);2013年

相關(guān)碩士學(xué)位論文 前1條

1 田碧凝;稀土摻雜鋅酸釓鋇光轉(zhuǎn)換熒光粉的光譜性質(zhì)及發(fā)光機(jī)理研究[D];大連海事大學(xué);2013年

，

本文編號：1780270