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錫酸鈣材料的光譜特性研究+文獻綜述

時間:2019-06-02 19:52來源:畢業論文
利用高溫固相法合成了Ca2SnO4 :Dy3+/Er3+/Sm3+長余輝發光材料。利用X射線衍射儀分析了Ca2SnO4 物相結構,最終得到最佳燒結溫度。利用熒光光譜儀研究了:Dy3+/Er3+/Sm3+離子濃度對樣品發光強度的

摘要利用高溫固相法合成了Ca2SnO4 :Dy3+/Er3+/Sm3+長余輝發光材料。利用X射線衍射儀分析了Ca2SnO4 物相結構,最終得到最佳燒結溫度。利用熒光光譜儀研究了:Dy3+/Er3+/Sm3+離子濃度對樣品發光強度的影響,結果顯示:隨Dy3+/Er3+/Sm3+濃度的增大,發射光譜強度先增大后減小,出現了濃度猝滅效應, Dy3+、 Er3+、 Sm3+的最佳摩爾分數分別為3%、 2%、1%。接下來研究了Ca2SnO4 :Dy3+/Er3+/Sm3+的余輝性質,通過余輝衰減曲線我們可以得出Ca2SnO4 :Dy3+/Er3+/Sm3+的余輝時間分別為91.26s,24.1s,94.41s,通過熱釋光譜我們得出了陷阱深度分別是0.478eV,0.615eV,0.601eV。并且還研究了共摻雜堿金屬元素K+和Na+對樣品余輝性能的影響:在向摻雜Er3+和Dy3+的Ca2SnO4中共摻雜K+和Na+,樣品沒有明顯增強余輝時間的效果;而在向摻雜Sm3+的Ca2SnO4中共摻雜Na+,樣品有十分明顯增強余輝時間的效果。最后,在實驗數據的基礎上解釋長余輝發光的機理。 35979
畢業論文關鍵詞:  Ca2SnO4 ;激發發射光譜;衰減;熱釋光譜 The study of spectral characteristics of Ca2SnO4 Abstract:Long afterglow luminescence materials:Ca2SnO4:Dy3+/Er3+/Sm3+ have been successfully synthesized by high temperature solid  state method. The crystal structures and intensities of the phosphors of Ca2SnO4:Dy3+/Er3+/Sm3+ samples were analyzed by means of X-ray powder diffraction (XRD) and fluorescence spectrometer. The sintering temperature and the influence of Dy3+/Er3+/Sm3+ concentrations on the luminescent intensities were investigated. The results show that with the Dy3+/Er3+/Sm3+ ions concentration increased, emission spectrum intensity first increases then decreases and then the concentration quenching effect comes out. The optimized mole fraction of Dy3+/Er3+/Sm3+ is 3%, 2%, 1% respectively. Then the afterglow properties of Ca2SnO4 :Dy3+/Er3+/Sm3+ are studied: through the afterglow decay curves we can draw the afterglow time is  91.26s, 24.1s, 94.41s  respectively, and through the thermoluminescence spectrum we conclude that the trap depths are 0.478eV, 0.615eV, 0.601eV respectively. Moreover, the influences of the total of doped alkali metal elements: K+ and Na+ to the afterglow performance of the sample are studied: to the Ca2SnO4:Dy3+/Er3+, the alkali metal elements (K+ and Na+) are co-doped, the sample afterglow effect is not so remarkable but the effect of K+ is significant. At last, the mechanism of long afterglow luminescence is explained based on the experimental data.

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Key Words:   Ca2SnO4; excitation-emission spectroscopy; decay; TSL spectra  
目錄
1緒論.1
1.1長余輝發光材料研究的意義和進展1
1.2錫酸鈣材料的簡介2
1.3Ca2SnO4:Dy3+/Er3+/Sm3+發光材料的制備方法.2
1.3.1高溫固相法.3
1.3.2溶膠-凝膠法3
1.3.3化學沉淀法.4
1.3.4微波合成法.4
1.3.5水熱法.5
1.4長余輝發光材料的發光機理5
1.5影響余輝時間長短的因素7
1.6主要影響因素——陷阱深度的測量方法8
1.6.1加熱速率法測定陷阱深度.8
1.6.2峰形擬合半寬法計算陷阱深度.9
2實驗.10
2.1實驗原材料和藥品10
2.2實驗用儀器設備10
2.3制備方法的選擇11
2.4試樣制備12
2.4.1經不同溫度燒結的Ca2SnO412
2.4.2摻雜了不同稀土元素(Dy3+/Er3+/Sm3+)的Ca2SnO4.13
2.5工藝優化14
2.5.1燒結溫度的影響.14
2.5.2Dy3+/Er3+/Sm3+摻雜比例的影響15
2.5.3共摻雜堿金屬離子的影響.15
2.6測試與表征15
3結果與討論.15
3.1結構特性——燒結溫度的影響15
3.2Dy3+/Er3+/Sm3+摻雜比例的影響.16
3.2.1對物相的影響.16
3.2.2對發光性能的影響.18
3.3余輝性質22
3.3.1Dy3+摩爾分數為3%時的余輝性質.22
3.3.2Er3+摩爾分數為2%時的余輝性質26 錫酸鈣材料的光譜特性研究+文獻綜述:http://www.aftnzs.live/cailiao/20190602/34218.html
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