Fig. 3: Lattice strain variations and recombination dynamics.

a, b Raman spectra of IPG and control QDs at different stages. The purple dotted line refers to TO mode, the black dotted line refers to SO mode and the red/blue dotted line refers to the 1LO mode of IPG/control QDs. c, Raman shift and 1LO linewidth versus different stages of QDs, relative change in lattice constants versus different stages of core, core/IPG, core/ZnSe QDs. The inverse Fourier transform (FFT) images of core/IPG QDs (top) and core/ZnSe QDs (bottom) along [111] are also shown on the right side. The scale bar is 2 nm. d, e TA spectra at selected timescales for IPG and control QDs. f, g PB1 bleach dynamics of IPG and control QDs at different excitation densities. h The bleach amplitude of PB1 as a function of excitation density. i, Average lifetime of PB1 dynamics as a function of excitation density for IPG and control QDs. The schematic diagram depicts the Auger recombination under high excitation density.