Spontaneous crystallization of strongly confined CsSn<sub>x</sub>Pb<sub>1-x</sub>I<sub>3</sub> perovskite colloidal quantum dots at room temperature.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38383585.
- Also identified by DOI 10.1038/s41467-024-45945-1 and PMC identifier 10881968.
- Licence recorded as CC BY.
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Abstract
The scalable and low-cost room temperature (RT) synthesis for pure-iodine all-inorganic perovskite colloidal quantum dots (QDs) is a challenge due to the phase transition induced by thermal unequilibrium. Here, we introduce a direct RT strongly confined spontaneous crystallization strategy in a Cs-deficient reaction system without polar solvents for synthesizing stable pure-iodine all-inorganic tin-lead (Sn-Pb) alloyed perovskite colloidal QDs, which exhibit bright yellow luminescence. By tuning the ratio of Cs/Pb precursors, the size confinement effect and optical band gap of the resultant CsSn<sub>x</sub>Pb<sub>1-x</sub>I<sub>3</sub> perovskite QDs can be well controlled. This strongly confined RT approach is universal for wider bandgap bromine- and chlorine-based all-inorganic and iodine-based hybrid perovskite QDs. The alloyed CsSn<sub>0.09</sub>Pb<sub>0.91</sub>I<sub>3</sub> QDs show superior yellow emission properties with prolonged carrier lifetime and significantly increased colloidal stability compared to the pristine CsPbI<sub>3</sub> QDs, which is enabled by strong size confinement, Sn<sup>2+</sup> passivation and enhanced formation energy. These findings provide a RT size-stabilized synthesis pathway to achieve high-performance pure-iodine all-inorganic Sn-Pb mixed perovskite colloidal QDs for optoelectronic applications.