Magnetic field insensitive photoluminescence decay of ZnSe/CdS core/shell type-II colloidal quantum dots
JAPANESE JOURNAL OF APPLIED PHYSICS(2018)
摘要
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 (similar to 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. (C) 2018 The Japan Society of Applied Physics.
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