Hongwei Wang, Baowei Zhang, Boyang Wang, Sai Bai, Liwen Cheng, Yongsheng Hu and Siyu Lu*,
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引用次数: 0
Abstract
Quasi-2D perovskites based blue light-emitting diodes (LEDs) suffer from its poor electroluminescence performance, mainly caused by the nonradiative recombination in in defect-rich low-n phases and the unbalanced hole–electron injection in the device. Here, we developed a highly efficient quasi-2D perovskite based sky-blue LEDs behaving recorded external quantum efficiency (EQE) of 21.07% by employing carbon dots (CDs) as additives in the hole transport layer (HTL). We ascribe the high EQE to the effective engineering of CDs: (1) The CDs at the interface of HTLs can suppress the formation of low-efficient n = 1 phase, resulting a high luminescence quantum yield and energy transfer efficiency of the mixed n-phase quasi-2D perovskites. (2) The CDs additives can reduce the conductivity of HTL, partially blocking the hole injection, and thus making more balanced hole–electron injection. The CDs-treated devices have excellent Spectral stability and enhanced operational stability and could be a new alternative additive in the perovskite optoelectronic devices.
基于准二维过氧化物的蓝色发光二极管(LED)存在电致发光性能差的问题,这主要是由富含缺陷的低n相中的非辐射重组和器件中不平衡的空穴-电子注入造成的。在这里,我们通过在空穴传输层(HTL)中使用碳点(CD)作为添加剂,开发出了一种基于准二维过氧化物的高效天蓝色发光二极管,其外部量子效率(EQE)达到了 21.07%。我们将高 EQE 归功于 CD 的有效工程:(1)HTL 接口处的 CD 可以抑制低效率 n = 1 相的形成,从而使混合 n 相准二维过氧化物具有较高的发光量子产率和能量传递效率。(2)CD 添加剂可以降低 HTL 的电导率,部分阻断空穴注入,从而使空穴-电子注入更加平衡。经 CD 处理的器件具有优异的光谱稳定性和更高的工作稳定性,可作为一种新的添加剂用于包晶体光电器件。
期刊介绍:
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
- Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale
- Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies
- Modeling and simulation of synthetic, assembly, and interaction processes
- Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance
- Applications of nanoscale materials in living and environmental systems
Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.