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Circularly polarized light-emitting nanoparticle

外国特許コード F110004083
整理番号 N052-23WO
掲載日 2011年7月8日
出願国 欧州特許庁(EPO)
出願番号 09727057
公報番号 2280053
公報番号 2280053
出願日 平成21年3月26日(2009.3.26)
公報発行日 平成23年2月2日(2011.2.2)
公報発行日 平成26年12月31日(2014.12.31)
国際出願番号 JP2009056060
国際公開番号 WO2009122994
国際出願日 平成21年3月26日(2009.3.26)
国際公開日 平成21年10月8日(2009.10.8)
優先権データ
  • 2009JP056060 (2009.3.26) WO
  • 特願2008-088945 (2008.3.29) JP
発明の名称 (英語) Circularly polarized light-emitting nanoparticle
発明の概要(英語) Provided is a compound semiconductor nanoparticle that exhibits circularly polarized luminescence characteristics.
CdS prepared inside a core of ferritin, which is a cage-like protein, exhibits a high circularly polarized luminescence (CPL).
A wavelength of the circularly polarized luminescence (CPL) can be controlled by laser irradiation, thereby enabling utilization of the compound semiconductor nanoparticle in the field of bionanotechnology, for example, in creating a WORM (Write-Once Read-Many times) memory.
As the cage-like protein, which is a protein with a cavity formed therein, a protein belonging to the ferritin protein family, such as apoferritin, or a recombinant thereof can be used.(see diagramm)
特許請求の範囲(英語) [claim1]
1. A nanoparticle which exhibits a property of emitting circularly polarized light comprising a compound semiconductor nanoparticle encapsulated in a protein cage obtainable by irradiating the nanoparticle with a laser having a wavelength of 400 nm.
[claim2]
2. The nanoparticle according to claim 1,
wherein the protein is apoferritin.
[claim3]
3. The nanoparticle according to claim 1,
wherein the compound semiconductor is a II-VI compound semiconductor.
[claim4]
4. The nanoparticle according to claim 3,
wherein the II-VI compound semiconductor is CdS or ZnS.
[claim5]
5. A nanoparticle which exhibits a property of emitting circularly polarized light comprising a compound semiconductor nanoparticle that is surface-modified by a cage-like protein obtainable by irradiating the nanoparticle with a laser having a wavelength of 400 nm.
[claim6]
6. The nanoparticle according to claim 5,
wherein the compound semiconductor is a II-VI compound semiconductor or a III-V compound semiconductor.
[claim7]
7. A wavelength control method for a nanoparticle which exhibits a property of emitting circularly polarized light, comprising a step of irradiating a ferritin microparticle encapsulating the compound semiconductor nanoparticle with a laser having a wavelength of 400 nm thereby controlling a circularly polarized luminescence wavelength.
[claim8]
8. The wavelength control method according to claim 7,
wherein the circularly polarized luminescence wavelength is shifted to a longer wavelength by the laser irradiation.
[claim9]
9. The wavelength control method according to claim 7,
wherein an emission wavelength is shifted to a shorter wavelength by the laser irradiation.
[claim10]
10. A quantum dot memory,
wherein nanoparticles according to claim 1 are disposed two-dimensinally inside an insulating film layer.
[claim11]
11. A WORM type single quantum dot memory comprising nanoparticles according to claim 1.
[claim12]
12. A security paint material comprising nanoparticles according to claim 1.
  • 出願人(英語)
  • NARA INSTITUTE OF SCIENCE AND TECHNOLOGY
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • NAITOU MASANOBU
  • IWAHORI KENJI
国際特許分類(IPC)
欧州特許分類/主・副
  • B82Y010/00
  • B82Y020/00
  • B82Y030/00
  • B82Y040/00
  • C07K014/47
  • C09D007/12D2B
  • C09K011/56B2
  • G11B007/0045R
  • G11B007/005R
  • H01L031/0352
  • M08K003/30
  • M08K009/08
  • S11B007/241
指定国 Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
参考情報 (研究プロジェクト等) CREST Creation of Novel Nano-material/System Synthesized by Self-organization for Medical Use AREA
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