Pure Cs4PbBr6: Highly Luminescent Zero-Dimensional Perovskite Solids
AuthorsSaidaminov, Makhsud I.
Sarmah, Smritakshi P.
Zhumekenov, Ayan A.
Cho, Nam Chul
Mohammed, Omar F.
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractSo-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.
CitationSaidaminov MI, Almutlaq J, Sarmah S, Dursun I, Zhumekenov AA, et al. (2016) Pure Cs4PbBr6: Highly Luminescent Zero-Dimensional Perovskite Solids. ACS Energy Letters 1: 840–845. Available: http://dx.doi.org/10.1021/acsenergylett.6b00396.
SponsorsThe authors acknowledge the support of King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)
JournalACS Energy Letters