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Comparison of One- and Two-Photon Photoluminescence of Solution-Grown CsPbBr3 Bulk Crystals
Da-Chuan Li1, Zheng-Da Dong1, Hou Wang1
1State Key Laboratory of Photovoltaic Science and Technology, Department of Optical Science and Engineering, School of Information Science and Technology, Fudan University, Shanghai 200433, China.
Abstract:
We present a temperature-dependent photoluminescence (PL) study of solution-grown CsPbBr3 bulk crystal and thin film, using one-photon and two-photon excitations. Twin planes are observed in X-ray diffraction spectra in crystal. In analyzing PL peak position and spectral widths as function of temperature, we find that the electron-phonon interaction is generally stronger in CsPbBr3 crystals than in films. Moreover, with one photon excitation, emissions from excitons and trapped excitons are observed in CsPbBr3 crystal. Under two-photon excitation, only the emissions from trapped excitons are observed in bulk crystal. Our work demonstrates that two-photon excitation PL is more sensitive to the trapped excitons inside CsPbBr3, implicating an optical method to probe the inside quality of the crystal.
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