臺灣博碩士論文加值系統

本研究成功地合成了七種高紅光色飽和度的錳摻雜螢光體，並進行一系列的特性鑑定。其中錳分別取代不同的格位。上述化合物經由XRD晶相鑑定後確認皆不會因為錳摻雜後而改變原本結構。此外，化學分析電子能譜被用以輔助確定2p1/2與2p3/2束縛能值以證明錳的氧化態為+4。
激發光譜分析顯示、在近紫外波段存在兩個明顯的激發帶，其主要源自於4A2→4T1與4A2→4T2能階躍遷。此外放射光譜分析表明620 ~ 700 nm間的放射源自2E→4A2的零聲子躍遷，並伴隨電子振動邊帶所構成。放射光譜並顯示，A，D，F與G螢光體最適當的錳摻雜濃度皆為0.25 mol %，而B與C為1.0 mol %，以及E為0.5 mol %。
錳摻雜螢光體在C.I.E.色度的量測顯示其x座標值在0.72~0.73，y座標值在0.26~0.27的範圍內，整體呈現極為飽和且接近純淨的紅光座標值(0.735,0.265)，上述螢光特性突顯錳螢光體具備應用在藍光-近紫外發光二極體轉換光源和醫療光源的潛力。

The discovery and luminescent properties of seven highly saturated red-emitting Mn-activated phosphors are to be described in this thesis. As indicated by the X-ray (XRD) data, Mn was found to substitute for different cation sites. The XRD profiles for both Mn-doped phosphors were found to be in good agreement with those reported in literature. Moreover, the oxidation state of Mn has been confirmed to be 4+ as indicated by core level Mn 2p1/2 and 2p3/2 X-ray photoelectron spectra(XPS) spectra for the Mn4+-activated phosphors.
Furthermore, the comparisons of PLE spectra for the seven Mn4+-activated phosphors reveal that the two excitation bands occuring in near-UV range can be attributed to the 4A2→4T1,2(F) transitions of Mn4+ and the emission was found to be vibronic multiplets attributed to the 2E→4A2 transitions with wavelength ranging from 620 to 700 nm. As indicated by the photoluminescence (PL) spectra, the optimal Mn4+ dopant contents of A, D, F and G were found to be 0.25%, and for B as well as C were found to be 1.0%. Additionally, the optimal Mn4+ dopant contents in E is 0.5%. The C.I.E. chromaticity coordinates of these Mn4+-activated phosphors are exceptionally close to that (i.e., (0.735, 0.265)) of pure red. In summary, as a potential phosphor for white-light LEDs and medical light therapy the Mn4+-activated phosphors showed characteristically purely red emission in the range of 620~700 nm when excited with violet blue radiation.

總 目 錄
頁 次
中文摘要…………………………………………………………… i
英文摘要…………………………………………………………… iii
誌謝………………………………………………………………… v
總目錄……………………………………………………………… vii
表目錄……………………………………………………………… xi
圖目錄……………………………………………………………… xii
第一章 緒論……………………………………………………… 1
第二章 實驗方法………………………………………………… 23
第三章 實驗結果與討論………………………………………… 36
第四章 結論…………………………………………………………… 97
表目錄
頁 次
第一章 緒論…………………………………………………………… 1
第三章 實驗結果與討論……………………………………………… 36
圖目錄
頁 次
第一章 緒論…………………………………………………………… 1
第二章 實驗方法……………………………………………………… 23

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