| Citation: | JI Yu-jin, CHU Xue-ying, DONG Xu, LI Jin-hua. Visible light emission of ultraviolet polarization sensitive CsPbBr3 nano-films[J]. Chinese Optics, 2023, 16(1): 202-213. doi: 10.37188/CO.2022-0152
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In order to detect polarized ultraviolet light by visible optical elements, CsPbBr3 nanocrystal/metal wire-grid composited films were prepared. The stability of its fluorescence was improved by depositing Al2O3 passivation layer. The green fluorescence of polarization-sensitive perovskite nanocrystals film was obtained under ultraviolet exciting light. The results show that the crystal structure of the CsPbBr3 nanocrystals obtained by hot-injection method have a cubic crystal system structure with a square shape and an average size of about 39 nm. An obvious green fluorescence at about 530 nm were observed under ultraviolet light excitation of the nanocrystal colloidal solution. The fluorescence intensity of the CsPbBr3 nanocrystal/metal wire-grid composited film obtained by self-assembly changed periodically with the polarization direction of the excited light. The luminous polarization ratio is about 0.54. The fluorescence intensity of this composite film was enhanced when Al2O3 was deposited on its surface by atomic layer deposition technology. The polarization ratio of the passivated film can still reach 0.36. The above results show that the fluorescence stability and polarization of perovskite nanocrystals film can be optimized by the surface passivation and the introduction of metal wire-grids, respectively. The obtained ultraviolet polarization sensitive CsPbBr3 nanocrystals composited film exhibits important application value in the fields of ultraviolet polarization detection and liquid crystal display.
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