The combination of carbon quantum dots (CQDs) with transition
metal
disulfides results in 0D–2D composites with enhanced light
absorption properties. In the transient absorption spectrum of CQD–WS2 composites, photoinduced absorption feature of the intrinsic
state was inhibited by WS2. The suppressed photoinduced
absorption feature of the defect state appeared at a particular WS2 concentration (0.1–0.13 mg/mL), which indicates that
the capture ability of the defect state is enhanced by WS2. Transient absorption spectrum reveals the energy transfer dynamics
from intrinsic and defect states of CQDs to WS2. Energy
transfer efficiency can reach up to 92% at 0.2 mg/mL WS2. The understanding and manipulation of energy transfer dynamics
in 0D–2D composites has made great contributions in optical
devices.