Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1481109 | Journal of Non-Crystalline Solids | 2013 | 4 Pages |
•Our signal noise ratio of single color pump–probe measurement is bigger than 105.•Obvious coherent phonon of CdSeTe QDs (R = 3.9 nm) in glass matrix was observed.•Coherent phonon is attributed to resonant excitation because of Fröhlich coupling.•The component with long lifetime (~ ns) under non-resonant excitation originated from heat accumulation.
The ultrafast decays of CdSexTe1 − x (x = 0.32) quantum dots in the glass matrix were reported by use of one-color pump probe experiments. The size varies from 7.8 to 22 nm, has a longer rising time and a much longer lifetime. Obvious coherent phonons and electronic decays of CdSexTe1 − x quantum dots (R = 3.9 nm) are found with the excitation of band-edge energy, but only long electronic decays of CdSexTe1 − x quantum dots (R = 5.3, 11.0 nm) are observed. Coherent phonon is attributed to resonant excitation because of Fröhlich coupling. The component with long lifetime under non-resonant excitation originated from heat accumulation.