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|Type:||Artigo de periódico|
|Title:||Ultrafast Time Dynamics Of The Optical Absorption Of Cdte Quantum Dots In A Glass Matrix|
Brito Cruz C.H.
|Abstract:||We study the femtosecond dynamics of the optical absorption of CdTe Quantum Dots (QDs) in glass. The samples do not show broad band photoluminescence (PL) at the infrared region (emission from deep traps). The time evolution of the absorption shows an initial decay with time constants between 1.2 to 2.2 ps. They are four to seven times greater than previously measured values in samples with prominent infrared PL band. We conclude that the presence of deep traps have a fundamental influence on the dynamics of these QDs and relate the decay times to the conditions of sample fabrication. We also find evidence that the electron stays longer than the hole in the quantum confined state (QCS) to which they were excited.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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