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Title: | 次微米粒子螢光材料BaMgAl10O17:Eu2+, Mn2+
製備與分析 Synthesis and Characterization of BaMgAl10O17:Eu2+, Mn2+ for Submicron Phosphors |
Authors: | De-Cheng Wang 王德成 |
Advisor: | 吳乃立(Nae-Lih Wu) |
Keyword: | BaMgAl10O17:Eu2+, Mn2+,球磨,均勻相沈澱, BaMgAl10O17:Eu2+, Mn2+,ball milling,homogeneous precipitation, |
Publication Year : | 2008 |
Degree: | 碩士 |
Abstract: | 次微米粒子螢光材料BaMgAl10O17:Eu2+, Mn2+可直接由商業化的螢光粉經過濕式球磨的方式製備而得;亦可以均勻相沈澱法去合成製備。本研究論文包括了粒子形態改變的觀察、結晶程度的變化、發光強度的分析及粒徑大小與其分佈的量測。商業化螢光粉的粒子大小會隨著球磨時間增加而減小。在經過3小時的球磨時間後,粒徑的分佈十分集中,粒徑大小大約可達170 nm。而在球磨過後,發光強度非常明顯地降低。其中以回火的處理方式,可以有效地幫助改善發光強度。以水熱法將Mn2+摻雜進去球磨過後的商業化螢光粉BaMgAl10O17:Eu2+。此法也被試著拿來製備次微米粒子的BaMgAl10O17:Eu2+, Mn2+。然而不幸地,因為在原本的粉體中就只有相當少的間隔空隙可讓Mn2+進入,因此水熱法是不可行的辦法。在均勻相沈澱程序上,有塞子的錐形瓶及高壓釜是被拿來使用的兩個反應器。其中以高壓釜為反應器的均勻相沈澱法,可以控制螢光粉的粒徑大小,它會隨著反應溫度提高而減小,在反應溫度為95 °C,粒徑大小大約為100 nm。而在經過1400 °C的燒結後,粉體會有最佳的結晶相。但發光強度卻是與粒徑大小成正比的。 BaMgAl10O17:Eu2+, Mn2+ phosphor particles with submicron size were directly prepared by wet ball milling from the commodity and synthesized by homogeneous precipitation process. Morphology, crystallinity, photoluminescence (PL) intensity, particle size and size distribution were investigated. The particle size of the commercial phosphor was reduced with increasing milling time. The particle size distribution was very sharp and the size of particle was about 170 nm after 3 hrs of milling time. It also was found that the crystallinity and the PL intensity of the phosphor were decreased obviously after ball milling. Post-annealing treatment was helpful to improve the PL intensity finitely. Dope Mn2+ into the milled commercial phosphor BaMgAl10O17:Eu2+ by using hydrothermal method was also tried to prepare the submicron phosphor particles of BaMgAl10O17:Eu2+, Mn2+. Unfortunately, it was not a practicable method due to few vacant sites in the original phosphor. Two reactors, the flask with a stopper and the autoclave, were used in homogeneous precipitation process. The particle size of the phosphor BaMgAl10O17:Eu2+, Mn2+ could be controlled by using this method with the autoclave. It was decreased with increase in aging temperature. The size of particle was about 100 nm at 95 °C of aging temperature. The best crystallinity of the phosphor was observed after 1400 °C calcination. But the PL intensity was proportional to the particle size. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37552 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 化學工程學系 |
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ntu-97-1.pdf Restricted Access | 7.24 MB | Adobe PDF |
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