本文關(guān)鍵詞： Ag聚集體 硼酸鹽玻璃 白光LED　出處：《大連海事大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近些年,稀土離子發(fā)光材料被廣泛應(yīng)用于新型照明、激光和顯示材料等領(lǐng)域,并在其中占據(jù)著非常重要的地位。WLED作為第四代新型綠色照明光源,一方面可以提高照明質(zhì)量,另一方面可以提高照明效率。越來越多的科研人員對稀土離子摻雜的發(fā)光材料展開了廣泛的研究。為了探索采用玻璃熒光體實(shí)現(xiàn)白光LED的可能性,本實(shí)驗(yàn)分別制備了Sm~(3+)、Eu~(3+)、Nd~(3+)和Y~(3+)單摻的硼酸銀玻璃材料,期望通過結(jié)合Sm~(3+)、Eu~(3+)和Nd~(3+)位于紅橙光區(qū)域的紅光發(fā)射和Ag聚集體位于藍(lán)綠光區(qū)域的寬帶發(fā)射來實(shí)現(xiàn)樣品的全色發(fā)光。具體內(nèi)容如下:(1)使用高溫熔融淬火技術(shù)制備了不同濃度Sm~(3+)和Eu~(3+)摻雜的硼酸銀玻璃樣品,分別研究各組樣品的吸收光譜和激發(fā)、發(fā)射光譜隨濃度的變化,得到Ag多聚體在藍(lán)綠光區(qū)域的寬帶發(fā)射和Sm~(3+)及Eu~(3+)紅橙光區(qū)域的特征發(fā)射。分別選各組分中發(fā)光最強(qiáng)的樣品,測量其激發(fā)、發(fā)射譜,觀察到激發(fā)峰和發(fā)射峰隨監(jiān)測波長和激發(fā)波長移動(dòng),由此得出了不同形式Ag聚集體的存在。研究樣品的色坐標(biāo)和色溫,結(jié)果表明所設(shè)計(jì)的樣品發(fā)光較強(qiáng)、呈現(xiàn)出暖白光,在白光LED領(lǐng)域具有較大的商用價(jià)值。(2)采用同樣的方法制備了不同濃度Nd~(3+)摻雜的硼酸銀玻璃材料,研究了這些樣品的吸收光譜和熒光光譜,可以得出樣品中Ag以聚集體的形式存在。選取發(fā)射光譜中發(fā)光最強(qiáng)樣品,測量其激發(fā)譜和發(fā)射譜,可以觀察到激發(fā)峰和發(fā)射峰隨監(jiān)測波長和激發(fā)波長的移動(dòng),討論了Ag多聚體隨激發(fā)波長的變化。研究了樣品的色品坐標(biāo)與色溫值,得到了發(fā)光較強(qiáng)、發(fā)冷白光的玻璃,這對白光LED的研究具有一定的價(jià)值。(3)采用相同方法制備了不同濃度Y~(3+)摻雜的硼酸銀玻璃樣品。測量其吸收譜和465nm激發(fā)光下的發(fā)射譜,由此可以得出Ag聚集體的存在。將具有4f電子層的Sm~(3+)、Eu~(3+)、Nd~(3+)離子和不具有4f電子層的Y~(3+)摻雜硼酸銀玻璃樣品的光譜進(jìn)行歸一化比較,得到稀土離子的摻雜和Ag聚集體的聚集狀態(tài)及分布形式都沒有必然的聯(lián)系,Ag聚集體的分布只和激發(fā)、監(jiān)測波長有關(guān),但稀土離子摻雜濃度會(huì)引起晶體場的變化,從而導(dǎo)致樣品中Ag聚集體躍遷速率的變化。
[Abstract]:In recent years, rare earth ion luminescent materials have been widely used in new lighting, laser and display materials, and occupy a very important position. On the one hand, it can improve the lighting quality. On the other hand, it can improve lighting efficiency. More and more researchers have carried out extensive research on rare earth ion doped luminescent materials. In order to explore the possibility of using glass fluorescence to realize white LED. In this paper, we have prepared the mono-doped silver borate glass materials of Sm~(3, Euzia (3) and YTX (3), which are expected to be bonded with Sm~(3). Eu~(3) and Nd~(3) the red light emission in the red orange region and the broadband emission of Ag aggregates in the blue-green region to achieve the panchromatic luminescence of the sample. Silver borate glass samples with different concentrations of Sm~(3 and Eu~(3) were prepared by high temperature melt quenching. The absorption spectra, excitation spectra and emission spectra of each group were studied respectively with the change of concentration. The broad band emission of Ag polymer in the blue-green region and the characteristic emission in the region of Sm~(3) and Eu~(3) were obtained. The samples with the strongest luminescence were selected and the excitation and emission spectra were measured. It is observed that the excitation and emission peaks move with the monitoring and excitation wavelengths, and the existence of different Ag aggregates is obtained. The color coordinates and color temperatures of the samples are studied. The results show that the designed samples have strong luminescence. The silver borate glass doped with different concentrations of Nd~(3 was prepared by the same method. The absorption and fluorescence spectra of these samples were studied. The Ag in the sample was found to exist in the form of aggregates. The excitation and emission spectra were measured by selecting the most luminescent samples in the emission spectrum. The shift of excitation and emission peaks with monitoring wavelength and excitation wavelength was observed. The variation of Ag polymer with excitation wavelength was discussed. The color coordinate and color temperature of the sample were studied, and the strong luminescence was obtained. Cold, white glass. This method has certain value for the study of white light LED. Doped silver borate glass. Absorption spectra and emission spectra of 465 nm excited light were measured. Therefore, the existence of Ag aggregates can be obtained. The 4f electronic layer will be found in Sm~(3. The spectra of silver borate glass samples without 4f electron layer and Nd~(3 ion were normalized. It is found that the doping of rare earth ions and the aggregation state and distribution form of Ag aggregates are not necessarily related to the distribution of Ag aggregates only related to excitation and monitoring wavelength. However, the concentration of rare earth ions can cause the change of crystal field, which leads to the change of the transition rate of Ag aggregation in the sample.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ171.11;TN312.8

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