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Here, cesium lead bromide (CsPbBr<jats:sub>3<\/jats:sub>) quantum dots (QDs) were synthesized via the ligand\u2010assisted re\u2010precipitation method. Post\u2010synthesis treatment of CsPbBr<jats:sub>3<\/jats:sub> QDs using antimony tribromide improved the PL stability and optoelectronic properties of the QDs. In addition, the PLQY of the post\u2010treated sample was enhanced to 91% via post\u2010treatment, and the luminescence observed was maintained for 8\u2009days. The post\u2010synthesis treatment ensured defect passivation and improved the stability of CsPbBr<jats:sub>3<\/jats:sub> perovskite QDs. High\u2010resolution transmission electron microscopy revealed the presence of more ordered, uniform\u2010sized CsPbBr<jats:sub>3<\/jats:sub> QDs after post\u2010synthesis treatment, and the uniformity of the sample improved as the day passed. The formation of a mixed crystal phase was observed from X\u2010ray diffraction in both as\u2010synthesized, as well as post\u2010treated QDs samples with the possibility of a polycrystalline nature in the post\u2010treated CsPbBr<jats:sub>3<\/jats:sub> QDs as per the selected area electron diffraction pattern. The X\u2010ray photoelectron spectroscopy spectra confirmed the presence of antimony and the possibility of defect passivation in the post\u2010treated samples. These QDs can act as potential candidates in various optoelectronic applications such as photodetectors and light\u2010emitting diodes due to their high PLQY and longer lifetime.<\/jats:p>","DOI":"10.1002\/bio.4706","type":"journal-article","created":{"date-parts":[[2024,3,14]],"date-time":"2024-03-14T08:33:48Z","timestamp":1710405228000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Improved photoluminescence stability and defect passivation in SbBr<sub>3<\/sub> post\u2010treated CsPbBr<sub>3<\/sub> quantum dots under ambient conditions"],"prefix":"10.1002","volume":"39","author":[{"given":"Sruthi","family":"S","sequence":"first","affiliation":[{"name":"Department of Physics Amrita School of Physical Sciences, Amrita Vishwa Vidyapeetham  Coimbatore Tamil Nadu 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