Cortecchia Daniele, Soci Cesare, Cametti Massimo, Petrozza Annamaria, Martí-Rujas Javier
Istituto Italiano de Tecnologia Centre for Nano Science and Technology (CNST@PoliMi), Politecnico di Milano, Via Pascoli 70/3, 20133, Milan, Italy.
Interdisciplinary Graduate School, Energy Research Institute (ERI@N), Nanyang Technological University, Research Technoplaza, Nanyang Drive, 639798, Singapore, Singapore.
Chempluschem. 2017 May;82(5):681-685. doi: 10.1002/cplu.201600477. Epub 2016 Nov 10.
Hybrid lead halide perovskite semiconductors are attracting increasing attention for applications in optoelectronics. However, the high lead content calls for the development of greener and smarter alternatives through crystal engineering. This is extremely challenging since the use of functional cations often results in the disruption of the metal halide framework. Here we show the rational design of a new lead-free, copper-based hybrid perovskite following a second-sphere coordination approach. Our synthetic strategy allows the incorporation of an organic cationic fluorophore within the two-dimensional Cu-Cl framework of a layered copper perovskite. The functionalization results in a moisture-stable and near-UV/blue-emitting copper perovskite. Along with the possibility of extending the emission in the visible range by further synthetic design, our approach paves the way for the development of a new class of Pb-free perovskites with potential applications in solid-state lighting.
混合卤化铅钙钛矿半导体在光电子学应用中越来越受到关注。然而，高铅含量要求通过晶体工程开发更绿色、更智能的替代品。这极具挑战性，因为功能阳离子的使用往往会导致金属卤化物框架的破坏。在此，我们展示了一种基于第二配位层方法的新型无铅铜基混合钙钛矿的合理设计。我们的合成策略允许在层状铜钙钛矿的二维Cu-Cl框架内引入有机阳离子荧光团。这种功能化产生了一种防潮且发射近紫外/蓝光的铜钙钛矿。随着通过进一步的合成设计在可见光范围内扩展发射的可能性，我们的方法为开发一类在固态照明中有潜在应用的新型无铅钙钛矿铺平了道路。
