%0 Journal Article %1 doi:10.1021/acsenergylett.6b00396 %A Saidaminov, Makhsud I. %A Almutlaq, Jawaher %A Sarmah, Smritakshi %A Dursun, Ibrahim %A Zhumekenov, Ayan A. %A Begum, Raihana %A Pan, Jun %A Cho, Namchul %A Mohammed, Omar F. %A Bakr, Osman M. %D 2016 %J ACS Energy Letters %K bromide cesium luminescence perovskite %N 4 %P 840-845 %R 10.1021/acsenergylett.6b00396 %T Pure Cs4PbBr6: Highly Luminescent Zero-Dimensional Perovskite Solids %U http://dx.doi.org/10.1021/acsenergylett.6b00396 %V 1 %X 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.

@article{doi:10.1021/acsenergylett.6b00396, 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. }, added-at = {2017-01-19T09:45:30.000+0100}, author = {Saidaminov, Makhsud I. and Almutlaq, Jawaher and Sarmah, Smritakshi and Dursun, Ibrahim and Zhumekenov, Ayan A. and Begum, Raihana and Pan, Jun and Cho, Namchul and Mohammed, Omar F. and Bakr, Osman M.}, biburl = {https://www.bibsonomy.org/bibtex/23553827ffebb6b133dbcd4197d29264b/fabianopkm}, doi = {10.1021/acsenergylett.6b00396}, eprint = {http://dx.doi.org/10.1021/acsenergylett.6b00396}, interhash = {63feb904c50db0c9751d4ff5dbc09a9c}, intrahash = {3553827ffebb6b133dbcd4197d29264b}, journal = {ACS Energy Letters}, keywords = {bromide cesium luminescence perovskite}, number = 4, pages = {840-845}, timestamp = {2017-01-19T09:46:05.000+0100}, title = {Pure Cs4PbBr6: Highly Luminescent Zero-Dimensional Perovskite Solids}, url = {http://dx.doi.org/10.1021/acsenergylett.6b00396}, volume = 1, year = 2016 }