1. Stabilization of Lead-Tin-Alloyed Inorganic-Organic Halide Perovskite Quantum Dots
- Author
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Jino Im, Sang Il Seok, Bo Hyung Kim, Hanul Min, Aarti Mehta, and Riming Nie
- Subjects
Photoluminescence ,Materials science ,Color quality ,General Engineering ,General Physics and Astronomy ,chemistry.chemical_element ,Halide ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Sulfur ,0104 chemical sciences ,chemistry ,Chemical engineering ,Quantum dot ,Lattice (order) ,General Materials Science ,Inorganic organic ,0210 nano-technology ,Tin - Abstract
Recently, lead-tin-based alloyed halide perovskite quantum dots (QDs) with improved stability and less toxicity have been introduced. However, the perovskite QDs containing tin are still unstable and exhibit low photoluminescence quantum yields (PLQYs), owing to the presence of defects in the alloyed system. Here, we have attempted to introduce sulfur anions (S2-) into the host lattice (MAPb0.75Sn0.25Br3) as a promising route to stable alloyed perovskite QDs with improved stability and PLQY. In this study, we used elemental sulfur as a sulfur precursor. The successful incorporation of sulfur anions into the host lattice resulted in a highly improved PLQY (>75% at room temperature), which is believed to be due to a reduction in the defect-related non-radiative recombination centers present in the host lattice. Furthermore, we found that the emission property could be tuned between the bright green and cyan-bluish regions without compromising on color quality. This work invigorates the perovskite research community to prepare stable, bright, and color-tunable alloyed inorganic-organic perovskite QDs without compromising on their phases and color quality, which can lead to considerable advances in display technology.
- Published
- 2018