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Water Passivation of Perovskite Nanocrystals Enables Air-Stable Intrinsically Stretchable Color-Conversion Layers for Stretchable Displays.
Advanced Materials ( IF 29.4 ) Pub Date : 2020-07-26 , DOI: 10.1002/adma.202001989
Huanyu Zhou 1 , Jinwoo Park 1 , Yeongjun Lee 1 , Jae-Man Park 1 , Jin-Hoon Kim 2 , Joo Sung Kim 1 , Hyeon-Dong Lee 1 , Seung Hyeon Jo 1 , Xue Cai 3 , Lizhu Li 3 , Xing Sheng 3 , Hyung Joong Yun 4 , Jin-Woo Park 2 , Jeong-Yun Sun 1 , Tae-Woo Lee 1, 5, 6
Affiliation  

Conventional organic light‐emitting devices without an encapsulation layer are susceptible to degradation when exposed to air, so realization of air‐stable intrinsically‐stretchable display is a great challenge because the protection of the devices against penetration of moisture and oxygen is even more difficult under stretching. An air‐stable intrinsically‐stretchable display that is composed of an intrinsically‐stretchable electroluminescent device (SELD) integrated with a stretchable color‐conversion layer (SCCL) that contains perovskite nanocrystals (PeNCs) is proposed. PeNCs normally decay when exposed to air, but they become resistant to this decay when dispersed in a stretchable elastomer matrix; this change is a result of a compatibility between capping ligands and the elastomer matrix. Counterintuitively, the moisture can efficiently passivate surface defects of PeNCs, to yield significant increases in both photoluminescence intensity and lifetime. A display that can be stretched up to 180% is demonstrated; it is composed of an air‐stable SCCL that down‐converts the SELD’s blue emission and reemits it as green. The work elucidates the basis of moisture‐assisted surface passivation of PeNCs and provides a promising strategy to improve the quantum efficiency of PeNCs with the aid of moisture, which allows PeNCs to be applied for air‐stable stretchable displays.

中文翻译:

钙钛矿纳米晶体的水钝化可为可拉伸显示器提供空气稳定的本征可拉伸色彩转换层。

没有封装层的传统有机发光器件在暴露于空气中时很容易降解,因此实现空气稳定的固有可拉伸显示器是一个巨大的挑战,因为在潮湿环境下保护器件免受水分和氧气的渗透甚至更加困难。伸展。提出了一种由本征可拉伸电致发光器件(SELD)与包含钙钛矿纳米晶体(PeNCs)的可延展色彩转换层(SCCL)集成而成的,具有空气稳定性的本征可拉伸显示器。PeNCs暴露在空气中通常会衰减,但是当分散在可拉伸的弹性体基质中时,它们会抵抗这种衰减。这种变化是封端配体与弹性体基质之间相容性的结果。违反直觉,水分可以有效地钝化PeNCs的表面缺陷,从而显着提高光致发光强度和寿命。展示了可拉伸至180%的显示屏;它由稳定的SCCL组成,该SCCL下转换SELD的蓝色发射并将其重新发出绿色。这项工作阐明了PeNCs的水分辅助表面钝化的基础,并提供了一种有前景的策略,即借助水分来提高PeNCs的量子效率,这使PeNCs可以用于空气稳定的可拉伸显示器。
更新日期:2020-09-15
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