Strong room-temperature ultraviolet to red excitons from inorganic organic-layered perovskites, (R-NH3)2MX4 (M=Pb2+, Sn2+, Hg2+; X=I−, Br−)
Strong room-temperature ultraviolet to red excitons from inorganic organic-layered perovskites, (R-NH3)2MX4 (M=Pb2+, Sn2+, Hg2+; X=I−, Br−)
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来自无机有机层状钙钛矿的强室温紫外至红色激子，(R-NH3)2MX4（M=Pb2+、Sn2+、Hg2+；X=I−、Br−）
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
G. Prakash
中科院分区：
文献类型：
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作者：
Shahab Ahmad;G. Prakash
抽象的。成功制备并表征了多种 (R-NH3)2MX4 型层状无机-有机 (IO) 钙钛矿（其中 R：有机部分，M：二价金属，X：卤素）。 X射线衍射数据表明，这些无机和有机结构沿c轴交替堆叠，其中无机单层是扩展的共享角的MX6八面体，有机间隔物是有机实体的双层。由于量子和介电限制引起的激子结合能增强，这些层状钙钛矿表现出不寻常的室温激子吸收和光致发光。通过 (i) 二价金属离子（M=Pb2+、Sn2+、Hg2+）、(ii) 卤化物（X=I− 和 Br−）和 (iii) 有机部分 (R) 的系统组成变化，实验观察到宽光谱范围的光学激子可调性（350 至 600 nm）。特定的光致发光特征归因于扩展的 MX42− 网络的结构和最终的电子能带结构。这些 IO 混合物的成分依赖性光致发光可用于各种光子和光电器件。
Abstract. Many varieties of layered inorganic-organic (IO) perovskite of type (R-NH3)2MX4 (where R: organic moiety, M: divalent metal, and X: halogen) were successfully fabricated and characterized. X-ray diffraction data suggest that these inorganic and organic structures are alternatively stacked up along c-axis, where inorganic mono layers are of extended corner-shared MX6 octahedra and organic spacers are the bi-layers of organic entities. These layered perovskites show unusual room-temperature exciton absorption and photoluminescence due to the quantum and dielectric confinement-induced enhancement in the exciton binding energies. A wide spectral range of optical exciton tunability (350 to 600 nm) was observed experimentally from systematic compositional variation in (i) divalent metal ions (M=Pb2+, Sn2+, Hg2+), (ii) halides (X=I− and Br−), and (iii) organic moieties (R). Specific photoluminescence features are due to the structure of the extended MX42− network and the eventual electronic band structure. The compositionally dependent photoluminescence of these IO hybrids could be useful in various photonic and optoelectronic devices.