Abstract
Quantum-confined Stark effects (QCSEs) on exciton-decay dynamics in CdS0.31Se0.69 semiconductor quantum dots (QDs) embedded in a glass matrix have been studied by time-resolved photoluminescence emission spectroscopy under different electric fields up to 2.5×105 V/cm. Under both conditions, in the absence or in the presence of an applied electric field, the exciton luminescence decay in QDs is found to follow the stretched exponential function I(t)=I0exp(-At). The decay rate A and exponent are found to vary linearly with the applied electric field, which can be accounted for by the field-induced reduction of the confined electron and hole wave-function overlap in QDs. The QCSE observed in the QDs is weaker than those observed in semiconductor quantum-well structures.
| Original language | English |
|---|---|
| Pages (from-to) | 5457-5460 |
| Number of pages | 4 |
| Journal | Physical Review B |
| Volume | 51 |
| Issue number | 8 |
| DOIs | |
| State | Published - 1995 |