Abstract
Quantum-confined Stark effects (QCSE’s) on exciton-decay dynamics in semiconductor quantum dots (QD’s) embedded in a glass matrix have been studied by time-resolved photoluminescence emission spectroscopy under different electric fields up to 2.5× V/cm. Under both conditions, in the absence or in the presence of an applied electric field, the exciton luminescence decay in QD’s is found to follow the stretched exponential function I(t)=exp(-). The decay rate A and exponent β 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 QD’s. The QCSE observed in the QD’s is weaker than those observed in semiconductor quantum-well structures.
- Received 14 November 1994
DOI:https://doi.org/10.1103/PhysRevB.51.5457
©1995 American Physical Society