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Controlling Spatial Crystallization Uniformity and Phase Orientation of Quasi‐2D Perovskite‐Based Light‐Emitting Diodes Using Lewis Bases
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-12-20 , DOI: 10.1002/admi.201901860 Yaeeun Han 1 , Sungbin Park 1 , Jian Wang 2 , Sarthak Jariwala 2 , Kangmin Lee 3 , Connor G. Bischak 2 , Sohyeon Kim 1 , Jungyun Hong 1 , Sunwoo Kim 1 , Mi Jung Lee 3 , David S. Ginger 2 , Inchan Hwang 1
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-12-20 , DOI: 10.1002/admi.201901860 Yaeeun Han 1 , Sungbin Park 1 , Jian Wang 2 , Sarthak Jariwala 2 , Kangmin Lee 3 , Connor G. Bischak 2 , Sohyeon Kim 1 , Jungyun Hong 1 , Sunwoo Kim 1 , Mi Jung Lee 3 , David S. Ginger 2 , Inchan Hwang 1
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Crystallographic orientation has a significant impact on the optoelectronic properties of films of quasi‐2D perovskite quantum wells. Here, oxygen‐bearing Lewis bases are employed as additives to explore their ability to modulate spatial uniformity of crystallization and orientation of crystal phases. Different Lewis bases added into the precursor solutions incorporating the large organic ammonium cation, phenethylammonium (PEA+), lead to different crystallization kinetics, which are attributed to the varying stability of intermediate complexes. The microscopic photoluminescence heterogeneity and 2D X‐ray diffraction patterns of the thin films reveal that inclusion of Lewis bases can lead to spatially more uniform crystallization and random orientation, resulting in an enhancement in light‐emitting diode performance. In contrast, quasi‐2D phases formed without Lewis bases show poorer uniformity and preferentially vertical orientation. Comparing the Lewis base properties such as Mayer order unsaturation and polarizability suggests that the ability to weakly coordinate with lead and strongly interact with the large organic ammonium is a key factor in controlling the phase composition favorably toward highly luminescent light‐emitting diodes. This work may be of help to provide insight of what kinds of Lewis bases can be helpful to realize the desired phase composition for high performance of optoelectronic applications.
中文翻译：
使用Lewis碱控制准2D钙钛矿基发光二极管的空间结晶均匀性和相位取向
晶体学取向对准2D钙钛矿量子阱薄膜的光电性能有重大影响。在这里，含氧的路易斯碱被用作添加剂，以探索其调节结晶空间均匀性和晶相取向的能力。在前体溶液中添加了不同的Lewis碱，并加入了大型有机铵阳离子，苯乙铵（PEA +），导致不同的结晶动力学，这归因于中间配合物的稳定性的变化。薄膜的微观光致发光异质性和2D X射线衍射图表明，路易斯碱的引入可导致空间上更均匀的结晶和随机取向，从而提高发光二极管的性能。相比之下，在没有路易斯碱的情况下形成的准2D相显示出较差的均匀性，并且优先显示垂直取向。比较路易斯的碱性质，例如迈耶阶不饱和度和极化率，表明与铅弱配位并与大型有机铵强相互作用的能力是控制相组成朝着高亮度发光二极管方向发展的关键因素。
更新日期：2019-12-20
中文翻译：
使用Lewis碱控制准2D钙钛矿基发光二极管的空间结晶均匀性和相位取向
晶体学取向对准2D钙钛矿量子阱薄膜的光电性能有重大影响。在这里，含氧的路易斯碱被用作添加剂，以探索其调节结晶空间均匀性和晶相取向的能力。在前体溶液中添加了不同的Lewis碱，并加入了大型有机铵阳离子，苯乙铵（PEA +），导致不同的结晶动力学，这归因于中间配合物的稳定性的变化。薄膜的微观光致发光异质性和2D X射线衍射图表明，路易斯碱的引入可导致空间上更均匀的结晶和随机取向，从而提高发光二极管的性能。相比之下，在没有路易斯碱的情况下形成的准2D相显示出较差的均匀性，并且优先显示垂直取向。比较路易斯的碱性质，例如迈耶阶不饱和度和极化率，表明与铅弱配位并与大型有机铵强相互作用的能力是控制相组成朝着高亮度发光二极管方向发展的关键因素。
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