成果報告書詳細
管理番号20110000001378
タイトル*平成22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2011/12/13
報告書年度2010 - 2010
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 三菱化学株式会社 パナソニック株式会社
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
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 研究開発項目(1) 蛍光体のTb、Eu 使用量低減技術の開発 本項目では、高速量子化学計算による組成設計指針を利用しつつ、融解合成および粉体流動合成コンビナトリアルケミストリーという蛍光体に適したコンビナトリアル合成を用いて、実用的なレベルの発光効率を持つTb,Eu省使用型の新規蛍光体、熱・光照射に対して安定な希土類代替蛍光体を見出す。また、これらの新規蛍光体の量産技術の開発を行う。
英文要約1.Reduction of Tb, Eu usage in phosphor :
New types of efficient phosphors with lower concentration of Tb/Eu or free from Tb/Eu are developed by using combinatorial chemistry. An arc imaging furnace and an SiC furnace which enables rapid heating were introduced. For the purpose of replacing rare earth in phosphors, materials containing, Mn, V, were synthesized and their luminescent properties were examined. Besides the development of new phosphor, conventional phosphors with lower concentration were re-examined. A new computer program for quantum mechanical calculation using tight binding method was developed. A quantitative structure-property relationship proposed by Tohoku University successfully predicted the excitation and emission wavelength of Eu2+ doped blue phosphors.
2. Materials in the lamp:
For the purpose of obtaining higher efficiency of UV and visible light in the fluorescent lamp, glassy materials in the fluorescent lamp are developed. We develop luminous silica glass, which converts UV light passing through the phosphor to the glass surface into visible light. Efficient luminous silica glass is prepared by sintering porous silica doped with Cu or other metal element. This year, effect of doping element for Cu was investigated to enhance green emission from Cu. The other approach for more efficient light usage in fluorescent lamp is to increase the extraction efficiency from the glass tube. This year, with the help of theoretical simulation, amount of extraction efficiency which can be increased by the construction of surface structure was calculated. The calculation shows that extraction efficiency of light increases more than 15% with placing silica beads on the surface of outer side of glass.
3. Optimization of materials in the lamp system and process improvement in manufacturing. A test for the performance of phosphor in the lamp could be done only by constructing actual fluorescent lamp. This process is quite time-consuming and laborious, so we develop a new testing method that provides this evaluation in a short time without making a fluorescent lamp. An appropriate method to prepare test piece on a glass disk was developed. A few instruments were designed and constructed to observe different effects from deterioration of phosphors by UV light to structure of phosphor layer attached on the glass. Process improvement in manufacturing of the lamps is also important to reduce the usage of phosphors. New method to separate species of phosphor from waste tri-color phosphor using high gradient magnetic separation was developed to reduce the amount of waste tri-color phosphor occurring in the manufacturing process. Lowering the temperature at which the sintering is carried out after the coating of phosphor slurry on glass tube is also effective in reducing the usage of phosphor. This year, materials used for the binder and considered possible options to be taken to reduce the sintering temperature.
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