Abstract
The multi-exciton properties of InP/ZnS core-shell quantum dots were investigated with the excitation of 400 nm fs pulses by transient absorption technique. By fitting experimental results, the lifetimes of multi-exciton were obtained. The lifetime of 4-exciton was about 3.65 ps, 3-exciton was about 9.7 ps and bi-exciton was about 43 ps respectively. The relationship between the Auger recombination rate of multi-exciton and the number of excitons in InP/ZnS quantum dots obeyed cubic statistics. The obtained first-order Auger recombination rate constant was about 1/88 ps−1. Under incident intensities of 1.8 × 105 W/m2, up to four excitons was observed, and average 3.4 excitons were generated per InP/ZnS quantum dot.
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