Publication

Pure Cs4PbBr6: Highly Luminescent Zero-Dimensional Perovskite Solids

​Pure Cs4PbBr6: Highly Luminescent Zero-Dimensional Perovskite Solids
Makhsud I. Saidaminov, Jawaher Almutlaq, Smritakshi Phukan Sarmah, Ibrahim Dursun, Ayan A. Zhumekenov, Raihana Begum, Jun Pan, Namchul Cho, Omar F. Mohammed, and Osman M. Bakr
ACS Energy Lett., Just Accepted Manuscript
Makhsud I. Saidaminov, Jawaher Almutlaq, Smritakshi Phukan Sarmah, Ibrahim Dursun, Ayan A. Zhumekenov, Raihana Begum, Jun Pan, Namchul Cho, Omar F. Mohammed, Osman M. Bakr
perovskites
2016

 

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 co-formation 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 two orders of magnitude lower PLQY. Such PLQY of Cs4PbBr6 is significantly higher than other solid forms of lower dimensional metal halide perovskite derivatives, including 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.
DOI: 10.1021/acsenergylett.6b00396