期刊
PHYSICAL REVIEW B
卷 89, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.081303
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资金
- FRFCU [78260024]
- NSFC [61376103]
- BMWi-Germany [MF090215]
Multiple optical transitions from PbS quantum dots (QDs) in glass matrix are observed. Energy separations between them amount up to similar to 200 meV. Instead of being due to a size distribution of QDs, they are found to be related to a splitting of the lowest exciton levels. Systematic analysis of the relaxation dynamics reveals the lifetimes of the split states ranging from sub-100-ns to similar to mu s. Moreover, we observe excited and intrinsic states having a sub-100-ps and similar to ns lifetime, respectively. The behavior of the split structure can be modeled by a phonon-assisted relaxation mechanism. This investigation offers a conclusive interpretation for the wide distribution of experimentally observed nonequilibrium carrier lifetimes in PbS QDs.
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