Nonlinear Absorption Applications of CH3NH3PbBr3 Perovskite Crystals

作者：Wei Tzu Chiao; Mokkapati Sudha; Li Ting You; Lin Chun Ho; Lin Gong Ru; Jagadish Chennupati; He Jr Hau

来源：Advanced Functional Materials, 2018, 28(18): 1707175.

DOI：10.1002/adfm.201707175

<jats:title>Abstract</jats:title><jats:p>Researchers have recently revealed that hybrid lead halide perovskites exhibit ferroelectricity, which is often associated with other physical characteristics, such as a large nonlinear optical response. In this work, the nonlinear optical properties of single crystal inorganic–organic hybrid perovskite CH<jats:sub>3</jats:sub>NH<jats:sub>3</jats:sub>PbBr<jats:sub>3</jats:sub> are studied. By exciting the material with a 1044 nm laser, strong two‐photon absorption‐induced photoluminescence in the green spectral region is observed. Using the transmission open‐aperture <jats:italic>Z</jats:italic>‐scan technique, the values of the two‐photon absorption coefficient are observed to be 8.5 cm GW<jats:sup>−1</jats:sup>, which is much higher than that of standard two‐photon absorbing materials that are industrially used in nonlinear optical applications, such as lithium niobate (LiNbO<jats:sub>3</jats:sub>), LiTaO<jats:sub>3</jats:sub>, KTiOPO<jats:sub>4</jats:sub>, and KH<jats:sub>2</jats:sub>PO<jats:sub>4</jats:sub>. Such a strong two‐photon absorption effect in CH<jats:sub>3</jats:sub>NH<jats:sub>3</jats:sub>PbBr<jats:sub>3</jats:sub> can be used to modulate the spectral and spatial profiles of laser pulses, as well as to reduce noise, and can be used to strongly control the intensity of incident light. In this study, the superior optical limiting, pulse reshaping, and stabilization properties of CH<jats:sub>3</jats:sub>NH<jats:sub>3</jats:sub>PbBr<jats:sub>3</jats:sub> are demonstrated, opening new applications for perovskites in nonlinear optics.</jats:p>

• 出版日期2018-5-4