Spectral properties of inorganic CsPbBr3 quantum dots embedded in phosphate fibers

A fiber preform was attempted to prepare by the stacking method. After drawing and heat-treatment, a composite fiber with good stability was obtained using the CsPbBr3 glass ceramic as the core and the phosphate glass as the cladding. The formation of CsPbBr3 quantum dots in fibers was confirmed by Raman spectra. The results of the spectral testing indicated that the emission band of fibers after heat-treatment had the same red-shift as that of CsPbBr3 glass ceramics, but the emission peak wavelengths of the former were shorter than that of the latter. Moreover, as the length of fibers increased, the emission peak wavelength also was red-shifted. However, with the increase of heat-treatment temperature, the red-shift value of the emission peak wavelength of fibers became small as the length augmented. Due to the high loss of fibers near 520 nm, the result of laser amplification was not observed, which reflects that the preparation of fibers with short-wavelength lasers is still a challenge. © 2021