TY - JOUR
T1 - Time-space-resolved photoluminescence from (Zn,Cd)Se-based quantum structures
AU - Okamoto, Koichi
AU - Ko, Hyun Chul
AU - Kawakami, Yoichi
AU - Fujita, Shigeo
N1 - Funding Information:
This work was partly supported by the Kyoto University-Venture Business Laboratory Project, a Grant-in-aid for Scientific Research from the Ministry of Education, Science and Culture, Tateishi Science and Technology Foundation, Tokuyama Science and Technology Foundation and Hoso Bunka Foundation.
PY - 2000/6/2
Y1 - 2000/6/2
N2 - Spectroscopic technique which possesses both temporal and spacial resolution was developed by combining the pico-second pulsed laser system with the optical microscope. By using this technique, the time-resolved photoluminescence (TRPL) with micron spatial resolution was performed for the self-organized CdSe/ZnSe quantum dots (QDs) fabricated on GaAs(110) crystal surfaces. PL spectra of CdSe/ZnSe with 10 monolayer (ML) deposition thickness were composed of two emission bands peaking at 2.6 and 2.2 eV. These bands could be ascribed to the emissions from CdSe quantum wells (QWs) acting as wetting layers and QDs, respectively. With macroscopic excitation (spot size: 100 μm), temporal behavior of the emission band of QDs was characterized by multi-exponential decay. However, with microscopic excitation (spot size: 5 μm), it was found that both spectrum shapes and PL lifetimes have changed with sweeping the location of focus. Especially, the lifetimes were quite valuable and were well fitted by the single exponential decay. These results suggest that the radiative lifetime differs very much depending on the degree of exciton localization.
AB - Spectroscopic technique which possesses both temporal and spacial resolution was developed by combining the pico-second pulsed laser system with the optical microscope. By using this technique, the time-resolved photoluminescence (TRPL) with micron spatial resolution was performed for the self-organized CdSe/ZnSe quantum dots (QDs) fabricated on GaAs(110) crystal surfaces. PL spectra of CdSe/ZnSe with 10 monolayer (ML) deposition thickness were composed of two emission bands peaking at 2.6 and 2.2 eV. These bands could be ascribed to the emissions from CdSe quantum wells (QWs) acting as wetting layers and QDs, respectively. With macroscopic excitation (spot size: 100 μm), temporal behavior of the emission band of QDs was characterized by multi-exponential decay. However, with microscopic excitation (spot size: 5 μm), it was found that both spectrum shapes and PL lifetimes have changed with sweeping the location of focus. Especially, the lifetimes were quite valuable and were well fitted by the single exponential decay. These results suggest that the radiative lifetime differs very much depending on the degree of exciton localization.
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U2 - 10.1016/S0022-0248(00)00169-X
DO - 10.1016/S0022-0248(00)00169-X
M3 - Conference article
AN - SCOPUS:0033704113
SN - 0022-0248
VL - 214
SP - 639
EP - 645
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
T2 - The 9th International Conference on II-VI Compounds
Y2 - 1 November 1999 through 5 November 1999
ER -