| Project/Area Number |
25420308
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Electronic materials/Electric materials
|
|---|
| Research Institution | National Institute for Materials Science |
|---|
Principal Investigator |
Shimamura Kiyoshi 国立研究開発法人物質・材料研究機構, 光・電子材料ユニット, グループリーダー (90271965)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
Víllora García 国立研究開発法人 物質・材料研究機構, 光・電子材料ユニット, 主任研究員 (70566760)
ビジョラ ガルシア 国立研究開発法人物質・材料研究機構, 光・電子材料ユニット, 主任研究員 (90421411)
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
|
|---|
| Keywords | 高輝度白色LED / 蛍光体 / 単結晶 / 量子効率 / 高輝度白色LED/LD |
|---|
| Outline of Final Research Achievements |
For applications requiring a high-brightness, current white light emitting diodes present overheating problems, which drastically decrease their emission efficiency, color quality and lifetime. In this work, single crystal phosphors (SCPs), which are proposed as novel alternative to conventional ceramic powder phosphors (CPPs), have been investigated. This totally new approach takes advantage of the superior properties of single crystals in comparison with ceramic materials. SCPs exhibit an outstanding conversion efficiency and thermal stability up to 300℃. Furthermore, compared with encapsulated CPPs, SCPs possess a superior thermal conductivity, so that generated heat can be released efficiently. Therefore, SCPs represent the ideal, long-demanded all-inorganic phosphors for high-brightness white light sources, especially those involving the use of high-density laser-diode beams. Promising green SCP Ce:Lu3Al5O12 is demonstrated as well as yellow SCP Ce:Y3Al5O12.
|
