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Circularly polarized light-emitting nanoparticle

外国特許コード F110005529
整理番号 N052-23WO
掲載日 2011年9月7日
出願国 アメリカ合衆国
出願番号 93506609
公報番号 20110038025
公報番号 8390913
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17日(2011.2.17)
公報発行日 平成25年3月5日(2013.3.5)
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
  • 特願2008-088945 (2008.3.29) JP
  • 2009WO-JP56060 (2009.3.26) WO
発明の名称 (英語) Circularly polarized light-emitting nanoparticle
発明の概要(英語) (US8390913)
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.
特許請求の範囲(英語) [claim1]
1. A circularly polarized light-emitting nanoparticle comprising a compound semiconductor nanoparticle encapsulated in a protein cage, further characterized in that a circularly polarized luminescence wavelength is controlled by laser irradiation of the nanoparticle.
[claim2]
2. The circularly polarized light-emitting nanoparticle according to claim 1, wherein the protein is apoferritin.
[claim3]
3. The circularly polarized light-emitting nanoparticle according to claim 1, wherein the compound semiconductor is a II-VI compound semiconductor.
[claim4]
4. The circularly polarized light-emitting nanoparticle according to claim 3, wherein the II-VI compound semiconductor is CdS or ZnS.
[claim5]
5. A quantum dot memory, wherein circularly polarized light-emitting nanoparticles according to claim 1 are disposed two-dimensionally inside an insulating film layer.
[claim6]
6. A WORM type single quantum dot memory comprising circularly polarized light-emitting nanoparticles according to claim 1.
[claim7]
7. A security paint material comprising circularly polarized light-emitting nanoparticles according to claim 1.
[claim8]
8. A circularly polarized light-emitting nanoparticle comprising a compound semiconductor nanoparticle that is surface-modified by a protein, further characterized in that a circularly polarized luminescence wavelength is controlled by laser irradiation of the nanoparticle.
[claim9]
9. The circularly polarized light-emitting nanoparticle according to claim 8, wherein the compound semiconductor is a II-VI compound semiconductor or a III-V compound semiconductor.
[claim10]
10. A wavelength control method comprising obtaining a compound semiconductor nanoparticle encapsulated in a protein cage, and controlling a circularly polarized luminescence wavelength by laser irradiation of the circularly polarized light-emitting nanoparticle.
[claim11]
11. The wavelength control method according to claim 10, wherein the circularly polarized luminescence wavelength is shifted to a longer wavelength by the laser irradiation.
[claim12]
12. The wavelength control method according to claim 10, wherein an emission wavelength is shifted to a shorter wavelength by the laser irradiation.
  • 発明者/出願人(英語)
  • NAITOU MASANOBU
  • IWAHORI KENJI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • NARA INSTITUTE OF SCIENCE AND TECHNOLOGY
国際特許分類(IPC)
米国特許分類/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
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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