Development of rare-earth-free LED phosphors by simultaneous measurement of photoluminescence and photoacoustic signals
| Project/Area Number |
16K06779
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kanazawa Institute of Technology |
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Principal Investigator |
FUKADA HARUKI 金沢工業大学, 工学部, 准教授 (90509176)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | 蛍光体 / 光音響 / フォトルミネッセンス / 希土類フリー / 発光 / 非発光 / 酸化物 / Bi / ニオブ酸カルシウム / 光機能材料 |
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| Outline of Final Research Achievements |
The photoluminescent (PL) and photoacoustic (PA) properties in the powder phosphors of various oxide phosphors have been investigated. The intensities of PL and PA signals were found to be significantly affected by the substitution site and the crystalline structure of host material. Intense ultraviolet-blue PL emissions were observed from Bi-activated oxide phosphors prepared using monoclinic crystals such as Y4Al2O9 or Gd4Al2O9 as a host material. In addition, intense blue-green PL emission peaking at approximately 455 nm was obtained in the CaNb2O6:Bi (Bi content of 0.5 at%) phosphor with 0.5 at% Na doping. The whitish emission corresponds to the CIE color coordinates of (x=0.37, y=0.27) was obtained in the CaNb2O6:Bi,Eu phosphor (Bi content of 0.5 at% and Eu content of 4.0 at%), when excited by near-UV light at a wavelength of approximately 316 nm.
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| Academic Significance and Societal Importance of the Research Achievements |
光音響・フォトルミネッセンス同時可視化技術は，同一の励起光照射下での発光過程のPLと非発光過程の熱の同時測定が可能である。さらに，断続光とともに定常光を同時に照射する二波長励起方式の採用により，詳細な非発光過程の解析が可能になり，蛍光体内の欠陥や非発光中心の定量化およびこれらによって形成される欠陥準位へのエネルギー伝達過程のメカニズムを明らかにできる可能性が高まった。この測定技術を使用し，「光らない」条件（非発光過程）を最小化することによって高発光効率な蛍光体を探索する手法は，蛍光体の新たな開発手法として極めて有用であると考えている。
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Report
(4 results)
Research Products
(11 results)
