Measurement and assignment of the size-dependent optical spectrum in CdSe quantum dots
被引:1020
作者:
Norris, DJ
论文数: 0引用数: 0
h-index: 0
机构:
MIT,CAMBRIDGE,MA 02139MIT,CAMBRIDGE,MA 02139
Norris, DJ
[1
]
Bawendi, MG
论文数: 0引用数: 0
h-index: 0
机构:
MIT,CAMBRIDGE,MA 02139MIT,CAMBRIDGE,MA 02139
Bawendi, MG
[1
]
机构:
[1] MIT,CAMBRIDGE,MA 02139
来源:
PHYSICAL REVIEW B
|
1996年
/
53卷
/
24期
关键词:
D O I:
10.1103/PhysRevB.53.16338
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
We use photoluminescence excitation to study the electronic spectrum of CdSe quantum dots ranging from similar to 12 to similar to 53 Angstrom in radius. We follow the size evolution of ten quantum dot absorption features. Comparison of the spectra with theoretical predictions allows us to confidently assign six of these transitions. We discuss the most likely assignments for the remaining four. We And that the n(h)S(3/2)1S(e) and n(h)S(1/2)1S(e) transitions dominate the spectra, accounting for half of the observed features. Our size-dependent data exhibit two strong avoided crossings, demonstrating the importance of valence-band structure in the description of the excited states.