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研究生:周文元
研究生(外文):Wen-Yuan Jou
論文名稱:碘化銅奈米晶粒玻璃複合材料製成及其非線性吸光及光激發發光現象
論文名稱(外文):Nonlinear absorption and photoluminescence in CuI semiconductor microcrystallines doped borosilicate glass
指導教授:文在川
指導教授(外文):Tsai-Chuan Wen
學位類別:碩士
校院名稱:高雄醫學大學
系所名稱:醫藥暨應用化學系碩士班
學門:醫藥衛生學門
學類:藥學學類
論文種類:學術論文
論文出版年:2005
畢業學年度:93
語文別:中文
論文頁數:66
中文關鍵詞:碘化銅奈米晶粒非線性吸光光激發發光
外文關鍵詞:CuImicrocrystallinesNonlinear absorptionphotoluminescence
相關次數:
  • 被引用被引用:1
  • 點閱點閱:248
  • 評分評分:
  • 下載下載:20
  • 收藏至我的研究室書目清單書目收藏:0
我們以熔融與熱處理法將鹵化銅奈米晶體鑲嵌入硼酸矽玻璃中。大量的暗色球形奈米晶體可以被TEM觀察到,而其半徑約為4∼15nm。我們使用Q-switch Nd:YAG laser提供線性極化脈衝(pulse width∼6ns),在波長為355nm及532 nm的狀況下做為光源以進行其非線性吸收與光激發發光測定之實驗。
半導體內部非線性吸收的現象,以自由載子吸收及雙光子吸收為主,我們利用Z-scan的實驗方法,計算出自由載子的吸收截面σ及雙光子吸收係數β等數據。
在室溫下之鹵化銅鑲入之玻璃以波長355nm的雷射光將其激發時,會出現光激發發光現象。此發光光譜經由分光儀測得,為一非常寬的波帶其波峰處於520nm(≈2.38 eV)。同時我們觀察到,520 nm波峰的強度,與入射光強成正比。所以我們猜想光激發發光的主要路徑,可能是電子經載體吸附後在與電洞結合。
Cuprous halides nanocrystals embedded in borosilicate glass are prepared by a melt and heat-treatment method. A large amount of these nanocrystals appear as dark ball shape with radius roughly ranging from 4 to 15 nm according to the TEM analysis. A Q-switched Nd:YAG laser delivery linearly polarized pulses at 355 nm wavelength ( ) with ~6 ns pulse width is employed as light source for the nonlinear absorption and the photoluminescence (PL) experiments.
The two photon absorption (TPA) coefficient and the free carrier absorption (FCA) cross section above the band gaps of these quantum dots are suggested to be attributed to the TPA, the linearly generated FCA, and the TPA generated FCA. The propagation equation is , where N is the instantaneous free carrier density given by = . Under the weak absorption limit (i.e. the fluence is less than the critical fluence defined as ), our experimental data of inverse transmission (1/T) as a function of incident fluence can be properly fitted with a formula derived from the above equations, while we obtain the values of and that are comparable to the literature values.
Upon excitation with 355 nm laser pulses in those cuprous halide doped glasses at room temperature, PL is observed, as we know, for the first time as the incident fluence is . This emission becomes very bright when . We also measure these PL specta at room temperature with a 0.5-m monochromator equiped by a PMT. The signal intensity is obtained with direct digital scanning from 350~800 nm. These spectra consist of a very broad band and centered at the visible region of about 520 nm ( ). Similar spectrum centered around 515 nm is also observed at low excitation irradiance. The intensity of PL at 520 nm is measured vs. the input intensity, and the results display that this emitted energy increases linearly with irradiance. We therefore suggested that the PL could be due to the radiative recombonation associated with traps or defects from impurities in the cuprous halide nanocrystals and their glassy surroundings.
內文目錄
內文目錄………………………………………………………………Ⅰ
中文摘要……………………………………………………………....Ⅱ
英文摘要………………………………………………………………Ⅲ
圖之目錄………………………………………………………………Ⅴ
表之目錄……………………………………………………………....Ⅵ
第一章 緒論……………………………………………………………1
第二章 理論基礎………………………………………………………2
第三章 實驗部分……………………………………………………..10
3-1 儀器與藥劑………………………………………….10
3-2 玻璃樣品之製作…………………………………….12
3-3 穿透式電子顯微鏡(TEM)、UV-Vis吸收光譜之觀察…16
3-4 非線性光學測量…………………………………………17
第四章 結果與討論…………………………………………………...38
4-1 穿透式電子顯微鏡(TEM)……………………………….38
4-2 UV-Vis吸收光譜之觀察………………………………...39
4-3 XRD………………………………………………………40
4-4 Z軸掃(Z-Scan)掃描……………………………………...41
4-5 非線性穿透……………………………………………….45
4-6 玻璃之冷光(Lumincescence)發散測量………………….53
第五章 結論…………………………………………………………..56
第六章 參考文獻……………………………………………………..57
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