Improving the Stability of Metal Halide Perovskite Materials and Light-Emitting Diodes
Improving the Stability of Metal Halide Perovskite Materials and Light-Emitting Diodes
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DOI：
10.1002/adma.201704587
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发表时间：
2018-10-18
影响因子：
29.4
通讯作者：
Lee, Tae-Woo
中科院分区：
文献类型：
--
作者：
Cho, Himchan;Kim, Young-Hoon;Lee, Tae-Woo
金属卤化物钙钛矿（MHP）作为光发射体具有许多优点，例如具有直接带隙的高光致发光量子效率、非常窄的发射线宽、高电荷载流子迁移率、低能量无序、溶液可加工性、简单的颜色调节和低材料成本。基于这些优点，MHP最近在发光二极管领域显示出前所未有的根本性进展（最大电流效率从0.3到42.9 cd A（-1））。然而，钙钛矿发光二极管（PeLED）遭受MHP材料的固有不稳定性和由PeLED的操作引起的不稳定性。近年来，许多研究人员致力于克服这些不稳定性。在这里，PeLED中的不稳定性的起源进行审查，通过将其分为两种类型：（i）MHP材料和（ii）PeLED器件中的组成层和界面的不稳定性。然后，对提高MHP材料和PeLED稳定性的策略进行了评述，如A位阳离子工程、Ruddlesden-Popper相、添加剂和阻挡层抑制离子迁移、制备均匀的块状多晶MHP层以及制备稳定的MHP纳米颗粒。在此基础上，对PeLED显示应用的未来研究方向和前景进行了展望。
Metal halide perovskites (MHPs) have numerous advantages as light emitters such as high photoluminescence quantum efficiency with a direct bandgap, very narrow emission linewidth, high charge-carrier mobility, low energetic disorder, solution processability, simple color tuning, and low material cost. Based on these advantages, MHPs have recently shown unprecedented radical progress (maximum current efficiency from 0.3 to 42.9 cd A(-1)) in the field of light-emitting diodes. However, perovskite light-emitting diodes (PeLEDs) suffer from intrinsic instability of MHP materials and instability arising from the operation of the PeLEDs. Recently, many researchers have devoted efforts to overcome these instabilities. Here, the origins of the instability in PeLEDs are reviewed by categorizing it into two types: instability of (i) the MHP materials and (ii) the constituent layers and interfaces in PeLED devices. Then, the strategies to improve the stability of MHP materials and PeLEDs are critically reviewed, such as A-site cation engineering, Ruddlesden-Popper phase, suppression of ion migration with additives and blocking layers, fabrication of uniform bulk polycrystalline MHP layers, and fabrication of stable MHP nanoparticles. Based on this review of recent advances, future research directions and an outlook of PeLEDs for display applications are suggested.