| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Up-conversion phosphors Y2O3:Er,Yb, which convert near-infrared into visible emission, were synthesized from multinuclear lanthanide (Ln) complexes by thermal degradation. This preparation method was employed to control distribution of Er and Yb in the Y2O3 matrix to realize high conversion efficiency. The resultant nano particles with c.a. 50 nm in size exhibited visible luminescence by both 960 nm and 1550 nm excitations. Optimization of the dopant concentration resulted in 2 or 3 times higher luminance than that of samples prepared by conventional methods. Evaluation of luminescence response using a short-pulse laser revealed that composition showing high response differs from the composition showing the highest luminance.
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