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Triplet exciton-based long-lived phosphorescence is severely limited by the thermal quenching at high temperature. Herein, we propose a novel strategy based on the energy transfer from triplet self-trapped excitons to Mn2+ dopants in solution-processed perovskite CsCdCl3. It is found the Mn2+ doped hexagonal phase CsCdCl3 could simultaneously exhibit high emission efficiency (81.5%) and long afterglow duration time (150 s). Besides, the afterglow emission exhibits anti-thermal quenching from 300 to 400 K. In-depth charge-carrier dynamics studies and density functional theory (DFT) calculation provide unambiguous evidence that carrier detrapping from trap states (mainly induced by Cl vacancy) to localized emission centers ([MnCl6]4-) is responsible for the afterglow emission with anti-thermal quenching. Enlightened by the present results, we demonstrate the application of the developed materials for optical storage and logic operation applications.

Triplet exciton-based long-lived phosphorescence is severely limited by the thermal quenching at high temperature. Herein, we propose a novel strategy based on the energy transfer from triplet self-trapped excitons to Mn2+ dopants in solution-processed perovskite CsCdCl3. It is found the Mn2+ doped hexagonal phase CsCdCl3 could simultaneously exhibit high emission efficiency (81.5%) and long afterglow duration time (150 s). Besides, the afterglow emission exhibits anti-thermal quenching from 300 to 400 K. In-depth charge-carrier dynamics studies and density functional theory (DFT) calculation provide unambiguous evidence that carrier detrapping from trap states (mainly induced by Cl vacancy) to localized emission centers ([MnCl6]4-) is responsible for the afterglow emission with anti-thermal quenching. Enlightened by the present results, we demonstrate the application of the developed materials for optical storage and logic operation applications.

Triplet exciton-based long-lived phosphorescence is severely limited by the thermal quenching at high temperature. Herein, we propose a novel strategy based on the energy transfer from triplet self-trapped excitons to Mn2+ dopants in solution-processed perovskite CsCdCl3. It is found the Mn2+ doped hexagonal phase CsCdCl3 could simultaneously exhibit high emission efficiency (81.5 %) and long afterglow duration time (150 s). Besides, the afterglow emission exhibits anti-thermal quenching from 300 to 400 K. In-depth charge-carrier dynamics studies and density functional theory (DFT) calculation provide unambiguous evidence that carrier detrapping from trap states (mainly induced by Cl vacancy) to localized emission centers ([MnCl6]4−) is responsible for the afterglow emission with anti-thermal quenching. Enlightened by the present results, we demonstrate the application of the developed materials for optical storage and logic operation applications.

Lead-free halide perovskites have triggered appealing interests in the field of optoelectronics and photocatalysis due to their low toxicity, tunable optical and charge carrier properties. For the application point of view, it is desired to develop stable lead-free halide perovskites with multifunction. Herein, we successfully developed a series of Cs 2 Pt x Sn 1-x Cl 6 (0≤x≤1) with high stability, which show switchable photoluminescence and photocatalytic functions by varying the amount of Pt 4+ substitution. The Cs 2 Pt x Sn 1-x Cl 6 solid solution with dominant proportion of Pt 4+ shows broadband photoluminescence with lifetime in microsecond-timescale. The Cs 2 Pt x Sn 1-x Cl 6 solid solution with small amount of Pt 4+ substitution exhibits photocatalytic hydrogen evolution activity. Optical spectroscopy study reveals the switch between photoluminescence and photocatalysis function is controlled by sub-bandgap states. Our finding provides a new way to develop lead-free halide perovskites with multifunction and high stability.

Lead-free halide perovskites have triggered appealing interests in the field of optoelectronics and photocatalysis due to their low toxicity, tunable optical and charge carrier properties. For the application point of view, it is desired to develop stable lead-free halide perovskites with multifunction. Herein, we successfully developed a series of Cs 2 Pt x Sn 1-x Cl 6 (0≤x≤1) with high stability, which show switchable photoluminescence and photocatalytic functions by varying the amount of Pt 4+ substitution. The Cs 2 Pt x Sn 1-x Cl 6 solid solution with dominant proportion of Pt 4+ shows broadband photoluminescence with lifetime in microsecond-timescale. The Cs 2 Pt x Sn 1-x Cl 6 solid solution with small amount of Pt 4+ substitution exhibits photocatalytic hydrogen evolution activity. Optical spectroscopy study reveals the switch between photoluminescence and photocatalysis function is controlled by sub-bandgap states. Our finding provides a new way to develop lead-free halide perovskites with multifunction and high stability.