Envisioned as emerging building blocks for photovoltaic devices,semiconductor nanocrystals (NCs) possess unique properties determined by the quantum confinement effect.A synergetic combination of CdSe and CdTe NCs offers favorable conditions for the charge separation of photoexcited carriers at the interface due to the type Ⅱ alignment of their conduction and valence bands.Aiming to synthesize binary NCs system creates the possibility for electron and hole transporting with maximal interfacial area,benefiting NC chemistries with high extinction coefficients and providing an excellent tool for nanoscale design of light absorbing.We report on the systematic UV/Vis absorption,steady state and time resolved photoluminescence experiments reveal the energy transfer dynamics between the neighboring NCs in CdSe/CdTe system.This work demonstrates that efficient energy transfer can be achieved through engineering binary NCs with tunable particle size and band structure modulation,which may find potential applications as solar energy conversion devices.