Growth and Luminescence Properties of Large Size and High Quality CsCu2I3 Crystals
The all-inorganic CsCu2 I3 crystal was characterized by one-dimensional perovskite structure with orthorhombic crystal system and Cmcm space group,which was expected to be widely used in optoelectronic devices.In this paper,a transparent and high-quality CsCu213 single crystal with diameter of 1 inch(1 inch=2.54 cm)was grown by vertical Bridgman method,employing recrystallized CuI as the raw material.The phase structure and stability of the crystal were investigated by means of X-ray powder diffraction and thermogravimetric analysis.The optical and luminescence performance of the crystal was studied by means of ultraviolet-visible transmission spectroscopy,photoluminescence spectroscopy,fluorescence lifetime and fluorescence quantum yield.In addition,the variable temperature fluorescence spectra were measured at 100～250 K.The photoluminescence intensity decreases with increasing temperature due to strong electro-phonon coupling.The exciton binding energy(Eb)of the crystal is 98.12 meV.The study shows that the CsCu2I3 crystal exhibits good optical properties.
perovskiteCsCu2I3 crystalrecrystallization purificationBridgman methodfluorescence spectrumdecay timevariable temperature fluorescence spectrum
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