▎ 摘　　要

We prepared high quality and single-or bilayer graphene by Si sublimation method from 4H-SiC. The exciton relaxation dynamics of CdTe quantum dots (QDs) on epitaxial graphene was analyzed by picosecond single-photon timing spectroscopy, and the fast component was estimated to be 49 ps. This lifetime is in good agreement with the values calculated from Persson-Lang model (59 ps) and Swathi-Sebastian model (36 ps) of energy transfer, suggesting that the dominant process is energy transfer from CdTe QDs to graphene.