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Circularly polarized light-emitting nanoparticle

Foreign code F110005529
File No. N052-23WO
Posted date Sep 7, 2011
Country United States of America
Application number 93506609
Gazette No. 20110038025
Gazette No. 8390913
Date of filing Mar 26, 2009
Gazette Date Feb 17, 2011
Gazette Date Mar 5, 2013
International application number JP2009056060
International publication number WO2009122994
Date of international filing Mar 26, 2009
Date of international publication Oct 8, 2009
Priority data
  • P2008-088945 (Mar 29, 2008) JP
  • 2009WO-JP56060 (Mar 26, 2009) WO
Title Circularly polarized light-emitting nanoparticle
Abstract (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.
Scope of claims [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.
  • Inventor, and Inventor/Applicant
  • NAITOU MASANOBU
  • IWAHORI KENJI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • NARA INSTITUTE OF SCIENCE AND TECHNOLOGY
IPC(International Patent Classification)
Reference ( R and D project ) CREST Creation of Novel Nano-material/System Synthesized by Self-organization for Medical Use AREA
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