Wu Jiandong, Li Huixin, Yang Yang, Chen Yiling, Wang Zhongyu, Dong Fan, Liu Xinhao, Guo Yangyang, Yao Tanxi, Xu Yadong, Ye Qian, Wang Hongyue, Wang Hongqiang, Fang Yu
Department State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene, Xi'an, 710071, China.
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710071, China.
Angew Chem Int Ed Engl. 2024 Oct 21;63(43):e202411361. doi: 10.1002/anie.202411361. Epub 2024 Sep 12.
Perovskite light-emitting diodes (PeLEDs) that can be air-processed promises the development of displaying optoelectronic device, while is challenged by technical difficulty on both the active layer and hole transport layer (HTL) caused by the unavoidable humidity interference. Here, we propose and validate that, planting the polymer brush with tailored functional groups in inorganic HTL, provides unique bilateral embedded anchoring that is capable of simultaneously addressing the n phases crystallization rates in the active layer as well as the deteriorated particulate surface defects in HTL. Exemplified by zwitterionic polyethyleneimine-sulfonate (PEIS) in present study, its implanting in NiO HTL offers abundant nuclei sites of amino and sulfonate groups that balance the growth rate of different n phases in quasi-2D perovskite films. Moreover, the PEIS effectively nailed the interfacial contact between perovskite and NiO, and reduced the particulate surface defects in HTL, leading to the enhanced PLQY and stability of large-area blue perovskite film in ambient air. By virtue of these merits, present work achieves the first demonstration of the air-processed blue PeLEDs in large emitting area of 1.0 cm with peak external quantum efficiency (EQE) of 2.09 %, which is comparable to the similar pure-bromide blue PeLEDs fabricated in glovebox.
可进行空气处理的钙钛矿发光二极管（PeLEDs）有望推动显示光电器件的发展，但由于不可避免的湿度干扰，其在有源层和空穴传输层（HTL）方面面临技术难题。在此，我们提出并验证，在无机HTL中植入具有定制官能团的聚合物刷，可提供独特的双边嵌入式锚固，能够同时解决有源层中n相的结晶速率以及HTL中颗粒表面缺陷恶化的问题。以本研究中的两性离子聚乙烯亚胺磺酸盐（PEIS）为例，将其植入NiO HTL中可提供丰富的氨基和磺酸盐基团成核位点，平衡准二维钙钛矿薄膜中不同n相的生长速率。此外,PEIS有效地固定了钙钛矿与NiO之间的界面接触，并减少了HTL中的颗粒表面缺陷，从而提高了大面积蓝色钙钛矿薄膜在环境空气中的光致发光量子产率（PLQY）和稳定性。凭借这些优点，本工作首次展示了在大面积1.0 cm发射区域的空气处理蓝色PeLEDs，其峰值外量子效率（EQE）为2.09 %，与在手套箱中制备的类似纯溴化物蓝色PeLEDs相当。
