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Recently lead halide nanocrystals (quantum dots) have been reported withpotential for photovoltaic and optoelectronic applications due to theirexcellent luminescent properties. Herein excitonic photoluminescence (PL)excited by two-photon absorption in perovskite CsPbBr3 quantum dots (QDs) havebeen studied across a broad temperature range from 80K to 380K. Two-photonabsorption has been investigated with absorption coefficient up to 0.085 cm/GWat room temperature. Moreover, the photoluminescence excited by two-photonabsorption shows a linear blue-shift (0.25meV/K) below temperature of ~220K andturned steady with fluctuation below 1nm (4.4meV) for higher temperature up to380K. These phenomena are distinctly different from general red-shift ofsemiconductor and can be explained by the competition between lattice expansionand electron-phonon couplling.Our results reveal the strong nonlinearabsorption and temperature-independent chromaticity in a large temperaturerange from 220K to 380K in the CsPbX3 QDs, which will offer new opportunitiesin nonlinear photonics, light-harvesting and light-emitting devices.

Temperature-dependent excitonic photoluminescence Excited by Two-Photon Absorption in Perovskite CsPbBr3 Quantum Dots