成果報告書詳細
管理番号20130000000712
タイトル*平成24年度中間年報 希少金属代替材料開発プロジェクト 蛍光体向けテルビウム・ユーロピウム使用量低減技術開発及び代替材料開発 高速合成・評価法による蛍光ランプ用蛍光体向けTb、Eu低減技術の開発
公開日2013/10/18
報告書年度2012 - 2012
委託先名独立行政法人産業技術総合研究所 国立大学法人東北大学 国立大学法人新潟大学
プロジェクト番号P08023
部署名電子・材料・ナノテクノロジー部
和文要約
英文要約1. Recovery of rare earth phosphor from waste phosphors
A method to separate a single species of phosphor from waste tri-color phosphor using high gradient magnetic separation (HGMS) developed so far was used to separate actual waste phosphors supplied from recyclers. It was found that green phosphor (LaPO4:Ce,Tb (LAP)) with purity higher than 90% was successfully separated by high field gradient magnetic separation method when combined with appropriate cleaning process. Intensity of luminescence of LAP was 96-100% compared with pure LAP. For the purpose of achieving continuous operation in industrial use, a new HGMS apparatus suitable for separating phosphor was designed and constructed.
2. Development of new materials for the fluorescent lamp.
Luminance of LAP is decreased 3~4% by reducing 50% of Tb in LAP. Possible methods to compensate the reduction of the luminance were reviewed. It was deduced that reduction of particle size may be most appropriate for the enhancement the luminance of LAP.
3. A development of new material for the fluorescent lamp
For the lamp material, method to coat the fluorescent silica was investigated. It was found that silica layer thickness of which is 4-6-m was successfully coated. It was found that the layer shows significant luminance (30~35%) compared with phosphor layer.
4. Development of new LED phosphor
A new computer program to select crystals having specific coordination number was developed. Combined with a few method (prediction of peak position, quantum efficiency) developed so far, a few candidate of new phosphor was proposed. By synthesizing these materials by arc-image furnace, it was found that NaMgPO4:Eu shows red luminescence (620-650 nm) with the excitation 365nm to 460nm. For the purpose of increasing luminescence in polymer composite, luminescent silica incorporating LED phosphor was prepared. Silica incorporating Eu, Tb as emission centers were prepared, and it was found they exhibit quantum efficiency higher than 50% with near UV excitation.
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