posted on 2022-06-27, 13:35authored byMengyan Cao, Xiujian Zhao, Xiao Gong
In this work, we report large-scale
preparation of stable Sb3+ and Bi3+ codoped
Cs2ZrCl6 microcrystals for highly efficient
white light emission using ionic
liquids, demonstrating a broad dual-band white emission covering 400–800
nm. The dual emissions originate from the associated self-trapped
excitons of the [SbCl6]3– and [BiCl6]3– octahedra. Moreover, the ratio of the
dual-emission peaks can be effectively regulated by tuning the excitation
wavelength. Meanwhile, to improve the optical properties and stability,
ionic liquids are employed to assist the synthesis process of perovskite
materials. The white light emission of one of the samples demonstrates
CIE coordinates right in the center of the white light region (0.334,
0.331) and an excellent color rendering index (∼90.3), accompanied
by a 66.1% quantum efficiency. Moreover, our method allows the facile
synthesis of large batches of microcrystalline powders. Our findings
demonstrate the potential of white phosphors as single components
for future applications in lighting fields.