Zhou Binze, Qin Le, Wang Pengfei, Chen Zhuo, Zang Jianfeng, Zhang Jianbing, Wen Yanwei, Chen Rong
State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei, 430074, People's Republic of China.
Nanotechnology. 2022 Oct 28;34(2). doi: 10.1088/1361-6528/ac98ce.
Electron transport layers (ETLs) are important components of high-performance all-inorganic perovskite nanocrystals light-emitting diodes (PNCs-LED). Herein, atomic layer deposition (ALD) of inorganic ZnO layer is combined to the organic 1,3,5-Tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) to form dual ETLs to enhance both the efficiency and stability of PNCs-LED simultaneously. Optimization of ZnO thickness suggested that 10 cycles ALD yields the best performance of the devices. The external quantum efficiency of the device reaches to 7.21% with a low turn-on voltage (2.4 V). Impressively, the dual ETL PNCs-LED realizes maximumlifetime of 761 h at the initial luminance of 100 nit, which is one of the top lifetimes among PNCs-LEDs up to now. The improved performance of dual ETL PNCs-LED is mainly due to the improved charge transport balance with favorable energy level matching. These findings present a promising strategy to modify the function layer via ALD to achieve both highly efficient and stable PNCs-LED.
电子传输层（ETLs）是高性能全无机钙钛矿纳米晶体发光二极管（PNCs-LED）的重要组成部分。在此，无机ZnO层的原子层沉积（ALD）与有机1,3,5-三（1-苯基-1H-苯并咪唑-2-基）苯（TPBi）相结合，形成双电子传输层，以同时提高PNCs-LED的效率和稳定性。ZnO厚度的优化表明，10个循环的ALD产生了器件的最佳性能。该器件的外量子效率达到7.21%，开启电压低（2.4 V）。令人印象深刻的是，双电子传输层PNCs-LED在初始亮度为100尼特时实现了761小时的最长寿命，这是迄今为止PNCs-LED中最长的寿命之一。双电子传输层PNCs-LED性能的提高主要归因于电荷传输平衡的改善和良好的能级匹配。这些发现提出了一种通过ALD修饰功能层来实现高效且稳定的PNCs-LED的有前景的策略。
