不同銪/釹混合鍺酸鹽晶體之光譜研究;none

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题名:	不同銪/釹混合鍺酸鹽晶體之光譜研究;none
作者:	林軒聖;Lin,Hsuan-Sheng
贡献者:	化學研究所
关键词:	混鑭系鍺酸鹽化合物;hybrid lanthanide compounds
日期:	2012-07-24
上传时间:	2012-09-11 18:37:26 (UTC+8)
出版者:	國立中央大學
摘要:	本論文利用高溫高壓水熱法合成一系列不同莫耳比例的混鑭系金屬鍺酸鹽化合物：K3(EuxNd1-x)3Ge6O18 (x= 0.98, 0.96, 0.94, 0.84)。利用單晶X光繞射儀定出 K3(Eu0.98Nd0.02)3Ge6O18 的結構，且與K3Eu3Ge6O18粉末X光繞射圖譜進行比對確認為相同結構，並利用感應耦合電漿原子發射光譜分析儀 (ICP-AES)鑑定這一系列化合物的化學式。此系列的四個化合物與先前合成的 K3Eu3Ge6O18 互為等結構化合物，銪氧多面體以共邊的方式連接成一維無限延伸的Z型鏈，再以鍺氧多面體以共角連接形成的 [Ge3O9]6- 的三員環，以共邊及共角形式連接相鄰的 Z 型鏈，最終形成三維骨架結構。當混入第二種鑭系金屬如 Nd3+ 後，放射生命期遠比原 Eu3+ 化合物縮短許多，針對這些化合物中心金屬的發光行為，利用放光、激發光譜及放射生命期的測量進行探討。並以放射生命期的測量，討論不同配位基對中心金屬發光中心的影響。This series of hybrid lanthanide compounds were synthesized by the high-temperature, high pressure hydrothermal method. The four lanthanide germanates denote as: K3(EuxNd1-x)3Ge6O18 (x= 0.98, 0.96, 0.94, and 0.84). Single-crystal X-ray diffraction (XRD) was employed to determine the accurate crystal structure of K3(Eu0.98Nd0.02)3Ge6O18, whereas all of these hybrid compounds were confirmed by the powder X-ray diffraction pattern as the isostructural of K3Eu3Ge6O18. Their exact molecular formulas were determined by ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometer). These four hybrid compounds and K3Eu3Ge6O18 are isostructral, and the structure contain parallel zigzag chains of edge-sharing Eu-O polyhedral, which are linked by three-membered single ring [Ge3O9]6- germanate anions sharing vertices and edges for forming a 3-D framework structure. When Eu3+ is replaced by another lanthanide ion such as Nd3+ in K3Eu3Ge6O18, the photoluminescence (PL) is dramatically quenched and the radiative lifetime becomes much shorter. In this thesis, detailed experiments including PL spectroscopy, excitation spectroscopy, and radiative lifetime measurements were conducted. The results shed light on the possible mechanisms for this strong PL quenching in the hybrid lanthanides.
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