Mid-Infrared Luminescence of the High Stability Perovskite CsPbErBr-ZrF-BaF-LaF-AlF-NaF Fluoride Glass.

Perovskites have been studied because of their adjustable wavelength range, high color purity, and wide color gamut. However, they still face some problems such as poor stability and insufficient infrared luminescence. The perovskite glass can improve the stability and luminescence properties of the perovskite. In this paper, a highly stable CsPbErBr-ZBLAN fluoride glass with mid-infrared and visible light emission was prepared. The ZBLAN fluoride glass has good inertness, which can improve the stability of the CsPbErBr perovskite. The CsPbErBr-ZBLAN fluoride glass can prevent the perovskite from being destroyed by water, oxygen, and laser. The Er replaces Pb to bond with Br to become the luminescent center of the CsPbErBr-ZBLAN perovskite glass, which extends the luminescence to the mid-infrared region. In addition, its luminescent intensity is significantly higher than those of the ZBLAN-Er glass and CsPbErBr perovskite. After irradiation with a 365 nm UV lamp for 13 h, the luminescence intensity of the CsPbErBr-ZBLAN perovskite glass decreases only by 10%. The EDS spectrum shows that the elements of the CsPbErBr perovskite are uniformly distributed in the glass matrix. The X-ray diffraction spectrum shows that the sample has both the CsPbErBr perovskite phase and the glass phase. This indicates that CsPbErBr is well crystallized in the ZBLAN glass matrix. The three parameters calculated by the Judd-Ofelt theory show that the CsPbErBr perovskite can increase the covalency and asymmetry around the rare earth ion Er. The transmission electron microscope can clearly see the morphological structure of the CsPbErBr perovskite in the ZBLAN glass matrix. The infrared Fourier transform spectroscopy shows that the sample has lower phonon energy. This proves that the sample has good infrared luminescence characteristics. Finally, the visible and infrared light sources were prepared. Under the irradiation of the 365 nm ultraviolet lamp and 980 nm laser, the perovskite glass produces green light and infrared emission.