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Pure Cs4PbBr6: Highly Luminescent Zero-Dimensional Perovskite Solids
ACS Energy Letters ( IF 19.3 ) Pub Date : 2016-09-29 00:00:00 , DOI: 10.1021/acsenergylett.6b00396 Makhsud I. Saidaminov 1 , Jawaher Almutlaq 1 , Smritakshi Sarmah 1 , Ibrahim Dursun 1 , Ayan A. Zhumekenov 1 , Raihana Begum 1 , Jun Pan 1 , Namchul Cho 1 , Omar F. Mohammed 1 , Osman M. Bakr 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2016-09-29 00:00:00 , DOI: 10.1021/acsenergylett.6b00396 Makhsud I. Saidaminov 1 , Jawaher Almutlaq 1 , Smritakshi Sarmah 1 , Ibrahim Dursun 1 , Ayan A. Zhumekenov 1 , Raihana Begum 1 , Jun Pan 1 , Namchul Cho 1 , Omar F. Mohammed 1 , Osman M. Bakr 1
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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.
中文翻译：
纯Cs 4 PbBr 6：高度发光的零维钙钛矿固体
所谓的零维钙钛矿，例如Cs 4 PbBr 6，具有出色的发射性能。但是，Cs 4 PbBr 6大多是通过熔化前体而制备的，这通常会导致形成不希望有的相。在这里，我们报告了具有显着发射特性的纯Cs 4 PbBr 6的简单低温固溶处理合成。我们发现，固态的纯Cs 4 PbBr 6表现出45％的光致发光量子产率（PLQY），而其三维对应物CsPbBr 3则表现出更低的PLQY 2个数量级。Cs 4 PbBr的PLQY6明显高于其他固体形式的低维金属卤化物钙钛矿衍生物和钙钛矿纳米晶体。我们将PL的急剧增加归因于高激子结合能，我们估计约为353 meV，这可能是由Cs 4 PbBr 6的独特的Bergerhoff-Schmitz-Dumont型晶体结构诱导的，其中包含金属卤化物八面体在空间上受到限制。我们的发现将这类钙钛矿衍生物带到了色彩转换和发光应用的最前沿。
更新日期：2016-09-29
中文翻译：
纯Cs 4 PbBr 6：高度发光的零维钙钛矿固体
所谓的零维钙钛矿，例如Cs 4 PbBr 6，具有出色的发射性能。但是，Cs 4 PbBr 6大多是通过熔化前体而制备的，这通常会导致形成不希望有的相。在这里，我们报告了具有显着发射特性的纯Cs 4 PbBr 6的简单低温固溶处理合成。我们发现，固态的纯Cs 4 PbBr 6表现出45％的光致发光量子产率（PLQY），而其三维对应物CsPbBr 3则表现出更低的PLQY 2个数量级。Cs 4 PbBr的PLQY6明显高于其他固体形式的低维金属卤化物钙钛矿衍生物和钙钛矿纳米晶体。我们将PL的急剧增加归因于高激子结合能，我们估计约为353 meV，这可能是由Cs 4 PbBr 6的独特的Bergerhoff-Schmitz-Dumont型晶体结构诱导的，其中包含金属卤化物八面体在空间上受到限制。我们的发现将这类钙钛矿衍生物带到了色彩转换和发光应用的最前沿。
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