Abstract
In this paper, upconversion luminescence from CH3NH3PbBr3 perovskite under pulsed laser illumination is reported. Excitation of bromide perovskite powders with a UV wavelength results in green PL bands at 562 nm. Infrared-to-visible upconversion luminescence is demonstrated in CH3NH3PbBr3 hybrid perovskites under 1064 nm nanosecond pulsed laser irradiation at room temperature. The shapes of both emission spectra are nearly identical, with a maximum at 562 nm. The green fluorescence emission is discernible by the naked eye. A remarkable feature of CH3NH3PbBr3 perovskite is the fact that fluorescence emission can be induced UV or NIR wavelength through different absorption processes. Upconversion luminescence is identified by measuring the NIR pump beam intensity dependence of luminescence which illustrates that the upconverted emission is induced by three-photon absorption process. The quadratic dependency of PL peak position on incident intensity is also another verification for the three-photon absorption process.
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