Charge-tunable optical properties in colloidal semiconductor nanocrystals
Charge-tunable optical properties in colloidal semiconductor nanocrystals
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DOI：
10.1021/jp0035683
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发表时间：
2001-03-29
影响因子：
3.3
通讯作者：
Guyot-Sionnest, P
中科院分区：
文献类型：
--
作者：
Shim, M;Wang, CJ;Guyot-Sionnest, P
胶体半导体纳米晶体的光学性质被发现是非常敏感的过剩电子。电子在最低的量子限制态的导带的CdSe和（CdSe）ZnS纳米晶体淬火光致发光的几个数量级，在同一时间，导致一个强大的，中红外带内吸收和漂白的带间激子跃迁。表面电子也有效地淬灭光致发光，但更宽的带隙ZnS的钝化层可以减少它们的影响。结果表明，单电子开关的光致发光可能是可行的，与改进的核/壳结构的半导体纳米晶体。
The optical properties of colloidal semiconductor nanocrystals are found to be extremely sensitive to excess electrons. Electrons in the lowest quantum-confined state of the conduction band of CdSe and (CdSe)ZnS nanocrystals quench photoluminescence by several orders of magnitude, at the same time, leading to a strong, mid-infrared intraband absorption and bleaching of the interband exciton transitions. Surface electrons are also efficient in quenching photoluminescence, but a passivating layer of wider band gap ZnS can reduce their influence. The results suggest that single-electron switching of photoluminescence may be feasible with improved core/shell structures of semiconductor nanocrystals.