Highly Efficient and Flexible Perovskite Nanocrystal Light-Emitting Diodes on Disposable Paper Substrates.
Highly Efficient and Flexible Perovskite Nanocrystal Light-Emitting Diodes on Disposable Paper Substrates.
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DOI：
10.1021/acsami.3c10070
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发表时间：
2023-09
影响因子：
9.5
通讯作者：
Feisong Qin;Ting Li;Min Lu;Siqi Sun;Po Lu;X. Li;Nannan Feng;Yu Zhang;Yanbo Gao;Zhennan Wu;Junhua Hu;Fengping Yan;Xue Bai
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文献类型：
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作者：
Feisong Qin;Ting Li;Min Lu;Siqi Sun;Po Lu;X. Li;Nannan Feng;Yu Zhang;Yanbo Gao;Zhennan Wu;Junhua Hu;Fengping Yan;Xue Bai
纳米晶具有优异的光电性能，在发光二极管（LED）领域有着广泛的应用。然而，由于柔性基板的高粗糙度、差的润湿性和低耐久温度，当将器件从刚性基板转移到柔性基板时，通常存在器件效率的严重劣化。本文报道了一种以标签纸为衬底、聚甲基丙烯酸甲酯（PMMA）为改性层的高柔性钙钛矿发光二极管（PeLED）。与基于常用聚对苯二甲酸乙二醇酯（PET）基材的参考器械相比，基于标签纸/PMMA的器械在从刚性基材转移到柔性基材时未显示出器械性能降低。这主要是因为PMMA改性后的标签纸粗糙度低、润湿性好，显著提高了底电极和功能层的成膜能力。此外，通过三点弯曲挠曲测试探索了两种装置的柔性，表明基于标签纸的装置由于标签纸的挠曲模量较低而具有比基于聚乙烯丙烯酸酯的装置更好的弯曲稳定性。因此，标签纸基柔性PeLED表现出最高的外部量子效率（EQE）的14.3%之间的钙钛矿纳米晶基柔性LED和卓越的灵活性与29%的亮度退化后，弯曲1000个周期，在1.5毫米的小半径。这种延伸的基板纸将扩大PeLED在极其灵活和廉价的应用的机会。
Perovskite nanocrystals have been widely applied in the field of light-emitting diodes (LEDs) due to their excellent optoelectronic properties. However, there is generally a serious degradation of device efficiency when transferring the device from rigid to flexible substrates due to the high roughness, poor wettability, and low endurance temperature of flexible substrates. Herein, a highly flexible perovskite light-emitting diode (PeLED) by utilizing label paper as substrates and poly(methyl methacrylate) (PMMA) as the modified layer was reported. Compared with the reference device based on commonly used polyethylene terephthalate (PET) substrates, the label paper/PMMA-based devices did not show the degraded device performance when transferring from rigid to flexible substrates. This is mainly because of low roughness and good wettability of PMMA-modified label paper, which significantly improve the film-forming ability of the bottom electrode and functional layer. Furthermore, the flexibility of both devices was explored by a three-point bending flexural test, indicating that the label paper-based device has better bending stability than the polyethylene terephthalate-based one due to the lower flexural modulus for label paper. As a result, the label paper-based flexible PeLEDs exhibited the highest external quantum efficiency (EQE) of 14.3% among perovskite nanocrystal-based flexible LEDs and preeminent flexibility with 29% luminance degradation after bending for 1000 cycles at a small radius of 1.5 mm. This extension of the substrate to paper will widen the opportunity of PeLEDs in extremely flexible and inexpensive applications.