Fig. 3: Temperature-dependent exciton lifetime.
From: Single-photon superradiance in individual caesium lead halide quantum dots
a, Photoluminescence spectra from a single 23-nm CsPbBr3 QD as a function of temperature. b, Linewidth and exciton peak energy as a function of temperature, extracted from the spectra in a by performing single-Lorentzian fitting. With increasing temperature, the exciton photoluminescence emission energy blue shifts and the photoluminescence linewidth increases, as a result of exciton–phonon coupling. c, TRPL decay at 4 K (blue markers) and 90 K (red markers). Solid black lines indicate single-exponential decays with time constants of 100 ps at 4 K and 1 ns at 90 K. d, Lifetime as a function of temperature (colour coding identical to that in b). Inset: the corresponding radiative decay rate (Γrad) as a function of temperature fitted by an Arrhenius function (grey solid line). a.u., arbitrary units.
