Abstract
The intrinsic photoluminescence emission properties of high-quality bulk crystals of CH3NH3PbBr3 under excitation by two-photon absorption at 810 nm are presented. A strongly non-monotonous wavelength shift of the two-photon photoluminescence with increasing temperature is observed, which can be associated with discrete transitions between several stable crystalline phases. Experimentally, both temperature (5 – 300 K) and excitation density are varied. At room temperature, a scaling of the photoluminescence with the 4th power of the excitation density is observed, in contrast to a quadratic behavior at cryogenic temperatures. We attribute this due to a transition from exciton gas to free charge carriers with a temperature increase.
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