论文标题
无铅的一维混合钙壶的原子薄片具有可调的白色光发射的自我捕获激子的发射
Atomically thin sheets of lead-free one-dimensional hybrid perovskites feature tunable white-light emission from self-trapped excitons
论文作者
论文摘要
低维的有机无机钙钛矿协同化的两种独特的材料的优点，这些材料具有有趣的下一代光电材料：它们为原子上薄的，分层的材料提供了可定制的构件，同时提供了增强的收获和发光脑膜的功能。在这里，我们超越了原子上薄的材料需要面内共价键的范例，并报告了一维有机无机钙钛矿的单层[C $ _7 $ _7 $ H $ _ {10} $ n] $ _ 3 $ [BICL $ _5 $ _5 $] Cl。其独特的1d-2d结构可实现单层和自被捕的激子的形成，这些激子显示出白光发射。激子自我捕获的厚度依赖性导致发射能的极强转移。因此，这样的二维钙钛矿表明，已经足以实现原子薄的材料并提供独特的激子物理学的一维共价相互作用。这些发现使得可以更加一般的构造原理来调整和识别不再限于共价键合2D纸的二维材料。
Low-dimensional organic-inorganic perovskites synergize the virtues of two unique classes of materials featuring intriguing possibilities for next-generation optoelectronics: they offer tailorable building blocks for atomically thin, layered materials while providing the enhanced light harvesting and emitting capabilities of hybrid perovskites. Here, we go beyond the paradigm that atomically thin materials require in-plane covalent bonding and report single layers of the one-dimensional organic-inorganic perovskite [C$_7$H$_{10}$N]$_3$[BiCl$_5$]Cl. Its unique 1D-2D structure enables single layers and the formation of self-trapped excitons which show white light emission. The thickness dependence of the exciton self-trapping causes an extremely strong shift of the emission energy. Thus, such two-dimensional perovskites demonstrate that already 1D covalent interactions suffice to realize atomically thin materials and provide access to unique exciton physics. These findings enable a much more general construction principle for tailoring and identifying two-dimensional materials that are no longer limited to covalently bonded 2D sheets.
