成果報告書詳細
管理番号20120000000924
タイトル*平成23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2012/8/2
報告書年度2011 - 2011
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 compositions of phosphors working efficiently with lower concentration of Eu or Tb were searched, focusing on phosphate based materials. It was found that Na3Sc2(PO4)3:Eu with 5mol% Eu and single crystal phase of Ba2TiP2O9 exhibits intense luminescence. To aid a search of new phosphor composition, an empirical method to predict quantum efficiency from a given crystal structure was developed. Using this technique, a few crystals were proposed as phosphors with high efficiency.
LaPO4 (LAP) with reduced Tb (50% compared with standard LAP) was developed, and luminance and color-rendering property were simulated in the form of tri-color phosphor. Luminance in LAP with 50% was almost the same as that in LAP with 67% Tb (only 1% lower). A simulation of luminance in Y2O3:Eu (YOX) with reduced Eu content was simulated. It was shown that decrease of luminous flux in tri-color phosphor is within 1% with YOX containing 85% Eu compared with standard YOX.
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. Luminescent silica exhibiting high quantum efficacy was successfully prepared by precipitating nano-crystals of Zn2SiO4:Mn in silica. Internal quantum efficiency of the obtained silica was as high as 0.71. Luminance of the silica was 0.51 times for that in standard LAP. To examine a possible increase in luminance with combined use of phosphor. Transmittance of UV and visible light were examined by changing the thickness of layers of silica and phosphor.
A new method to prepare inorganic nano-pattern on glass was developed. Using a silica sol appropriately polymerized prior to coating, a nano-pattern was successfully transferred by using nano-inprint film as a template.
3. Optimization of materials in the lamp system and process improvement in manufacturing.
A performance test of LAP with reduced Tb (67%) in a straight type lamp was carried out. It was found that performance of this lamp was the same as that in a lamp with standard LAP.
A new method to separate a single 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. Using this method, LAP was successfully separated from the waste phosphor.
Effect of sintering temperature on the degradation of phosphors was examined. It was found that decrease of BaMgAl10O17 (BAM) in luminance was not observed with heating in air at sintering temperature in manufacturing process. It was shown that lowering sintering temperature for 100°C in lamp making process does not improve the performance of the lamp.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る