Fig. 4: Triplet energy transfer dynamics from IR783 to CsPbBr3:Yb3+ perovskite nanocrystals.
From: Near infrared sensitized exciton upconversion luminescence from inorganic perovskite nanocrystals
a Transient absorption spectrum of IR783-CsPbBr3 nanocrystals. b Transient absorption spectrum of IR783-CsPbBr3: Yb3+ nanocrystals. c TA decay of IR783-CsPbBr3 nanocrystals and IR783-CsPbBr3: Yb3+ nanocrystals over the entire measured timescale. d Triplet decay (top) and singlet decay (bottom) of IR783-CsPbBr3 nanocrystals compared with the decay of IR783-CsPbBr3: Yb3+ nanocrystals; the solid curves represent the corresponding single-exponential fitting results of the decay processes, detected at 522 nm, power density =1.58 μJ cm−2.
