| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
The new ammonothermal reactor has been developed. It has lower dead volume than previous one. SrAlSiN3:Eu2+ is a red-emitting phosphor that is potentially very useful in white light-emitting diodes because of its properties such as thermal stability and bright emissivity features.A limitation of this phosphor is that it is commonly synthesized at high temperature and pressure. To address this limitation, we investgate a low-temperature synthesis of SrAlSiN3:Eu2+ phosphors through a dissolution–precipitation process in supercritical ammonia and the phosphors’ physical properties. All products exhibit a broad emission that is centered at approximately 580 nm, which we attribute to the 5d→4f transition of Eu2+, under excitation wavelengths from the ultraviolet to blue range.
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