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Magnetic field insensitive photoluminescence decay of ZnSe/CdS core/shell type-II colloidal quantum dots

Title
Magnetic field insensitive photoluminescence decay of ZnSe/CdS core/shell type-II colloidal quantum dots
Authors
Lee, WoojinPark, SeonghoMurayama, AkihiroLee, Jong-SooKyhm, Kwangseuk
DGIST Authors
Lee, Jong-Soo
Issue Date
2018-06
Citation
Japanese Journal of Applied Physics, 57(6), 06HE06
Type
Article
Article Type
Article; Proceedings Paper
Keyword
EXCITON FINE-STRUCTURE; EXCHANGE INTERACTION; DARK-EXCITON; NANOCRYSTALS; HETEROSTRUCTURES; REGIMES; ENERGY
ISSN
0021-4922
Abstract
We have synthesized ZnSe/CdS core/shell type-II colloidal quantum dots, where an electron and a hole are separated in the CdS shell and the ZnSe core, respectively. Our theoretical model has revealed that absorbance spectrum of bare ZnSe quantum dots in 2 nm radius becomes broadened with a large redshift (∼1.15 eV) when the electron in ZnSe core is separated by 3.2nm CdS shell. Also, we found that our type-II QDs are insensitive to an external magnetic field up to 5 T in terms of central emission energy, degree of polarization, and photoluminescence decay time. This can be attributed to the electron-hole charge separation in a type-II structure, whereby the suppressed exchange interaction gives rise to a magnetic insensitivity with a small energy difference between the bright and dark exciton states. © 2018 The Japan Society of Applied Physics.
URI
http://hdl.handle.net/20.500.11750/9226
DOI
10.7567/JJAP.57.06HE06
Publisher
Japan Society of Applied Physics
Related Researcher
  • Author Lee, Jong-Soo MNEDL(Multifunctional Nanomaterials & Energy Devices Lab)
  • Research Interests Design of new type of multifunctional nanoparticles for energy-related devices; 다기능성 나노재료; 무기물 태양전지; 열전소자
Files:
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Collection:
Department of Energy Science and EngineeringMNEDL(Multifunctional Nanomaterials & Energy Devices Lab)1. Journal Articles


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