Lead-halide perovskite nanocrystals (PNCs) provide exciting prospects for the next generation of optoelectronic devices with its desirable properties such as being solution processible, having a size-and-alloy tunable bandgaps, higher defect tolerance and high luminescence quantum yields. When doped with metal cations, PNCs exhibit additional emission tunability, magnetic field sensitivities and the potential for dual emission. However, how doping affects underlying electronic structure and excited state dynamics in PNCs remains an open question. In an attempt to approach the question, we measured cryogenic temperature dependence of the emission and absorbance spectra of undoped alloyed CsPb(Brx)I3-x PNCs observing a peak narrowing and red shift in emission onset during cooling for the undoped PNCs due to reduced homogeneous broadening and lattice acoustic phonon contractions. We will compare this result to Mn-doped CsPb(Brx)I3-x PNCs, where we expect the dopant state to be more decoupled from the lattice and thus exhibit less temperature sensitivity. Our results will lead to development in doped PNCs applications such as light emitting diodes and photocatalysis.

Cryogenic optical properties of CsPb(Br/I)3 nanocubes

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