Pure Cs4PbBr6: Highly Luminescent Zero-Dimensional Perovskite Solids

Makhsud I. Saidaminov, Jawaher Almutlaq, Smritakshi P. Sarmah, Ibrahim Dursun, Ayan A. Zhumekenov, Raihana Begum, Jun Pan, Nam Chul Cho, Omar F. Mohammed, Osman Bakr

Research output: Contribution to journalArticlepeer-review

263 Scopus citations

Abstract

So-called zero-dimensional perovskites, such as Cs4PbBr6, promise outstanding emissive properties. However, Cs4PbBr6 is mostly prepared by melting of precursors that usually leads to a coformation of undesired phases. Here, we report a simple low-temperature solution-processed synthesis of pure Cs4PbBr6 with remarkable emission properties. We found that pure Cs4PbBr6 in solid form exhibits a 45% photoluminescence quantum yield (PLQY), in contrast to its three-dimensional counterpart, CsPbBr3, which exhibits more than 2 orders of magnitude lower PLQY. Such a PLQY of Cs4PbBr6 is significantly higher than that of other solid forms of lower-dimensional metal halide perovskite derivatives and perovskite nanocrystals. We attribute this dramatic increase in PL to the high exciton binding energy, which we estimate to be ∼353 meV, likely induced by the unique Bergerhoff–Schmitz–Dumont-type crystal structure of Cs4PbBr6, in which metal-halide-comprised octahedra are spatially confined. Our findings bring this class of perovskite derivatives to the forefront of color-converting and light-emitting applications.
Original languageEnglish (US)
Pages (from-to)840-845
Number of pages6
JournalACS Energy Letters
Volume1
Issue number4
DOIs
StatePublished - Sep 29 2016

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