Ultra‐High Pressure Phosphor Based on an Eco‐Friendly Perovskite Via Isovalent and Heterovalent Co‐Doping Engineering

A non‐toxic tin halide perovskite phosphor is synthesized via co‐doping chemical engineering. The photoluminescence of the phosphor can be tuned from green to red. An interesting evolution of fluorescence is revealed, as the pressure on the phosphor is first compressed from 1 atm up to an ultra‐high value of 23.5 GPa, and is then gradually released. Abstract Tin halide perovskites are good eco‐friendly alternatives to lead halide perovskites, whose toxicity problem can effectively be eliminated. In order to improve the fluorescence properties, in this work, a novel non‐toxic perovskite phosphor is successfully synthesized, employing both isovalent and heterovalent co‐doping chemical engineering. The photoluminescence of this new phosphor is prominent in the visible light regime, and the corresponding color can readily be tuned from green to red. Based on DFT calculations and time‐resolved photoluminescence spectra, a physical model that accounts for the light emission is proposed, where efficient energy transfers between self‐trapped excitons are addressed. Interestingly, the physical effect of Sb3 + heterovalent doping on the phosphor is observed in transient absorption spectra, manifesting itself as a spectral broadening. Remarkably, with increasing the pressure on the phosphor from 1 atm up to an ultra‐high value of 23.5 GPa, an interesting evolution of the photoluminescence spectrum is clearly revealed. This new phosphor and the dual‐ion co‐doping strategy may advance sustainable material science. A non-toxic tin halide perovskite phosphor is synthesized via co-doping chemical engineering. The photoluminescence of the phosphor can be tuned from green to red. An interesting evolution of fluorescence is revealed, as the pressure on the phosphor is first compressed from 1 atm up to an ultra-high value of 23.5 GPa, and is then gradually released. Abstract Tin halide perovskites are good eco-friendly alternatives to lead halide perovskites, whose toxicity problem can effectively be eliminated. In order to improve the fluorescence properties, in this work, a novel non-toxic perovskite phosphor is successfully synthesized, employing both isovalent and heterovalent co-doping chemical engineering. The photoluminescence of this new phosphor is prominent in the visible light regime, and the corresponding color can readily be tuned from green to red. Based on DFT calculations and time-resolved photoluminescence spectra, a physical model that accounts for the light emission is proposed, where efficient energy transfers between self-trapped excitons are addressed. Interestingly, the physical effect of Sb 3 + heterovalent doping on the phosphor is observed in transient absorption spectra, manifesting itself as a spectral broadening. Remarkably, with increasing the pressure on the phosphor from 1 atm up to an ultra-high value of 23.5 GPa, an interesting evolution of the photoluminescence spectrum is clearly revealed. This new phosphor and the dual-ion co-doping strategy may advance sustainable material science. Advanced Science, EarlyView.