Nanoshell-driven carrier engineering of large quantum dots enables ultra-stable and efficient LEDs

IF 9 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Research Pub Date : 2024-08-16 DOI:10.1007/s12274-024-6899-4

Dandan Zhang, Jianshun Li, Lei Wang, Yaqi Guo, Weipeng Liu, Qingli Lin, Lin Song Li, Huaibin Shen

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引用次数: 0

Abstract

Quantum dot (QD) light-emitting diodes (QLEDs) have been considered one of the most promising candidates for nextgeneration lighting and displays. However, the suboptimal carrier dynamics at the interface between QDs and the hole transport layer (HTL), such as leakage and quenching induced by the accumulation of electrons at high brightness, severely deteriorates the device’s efficiency and stability. Here, we introduced the influence of carrier modulation by nanoshell engineering on the extermal quantum efficiency (EQE) and operation lifetime for QLEDs with large-sized QDs. The shell-driven engineering of energy level positions and band bending effectively eliminates the hole injection barrier and promotes charge injection balance. Photo-assisted Kelvin probe technique reveals that the ZnCdSe/ZnSeS QD/TFB (TFB = poly(9,9-dioctylfluorene-co-N-(4-(3-methylpropyl))diphenylamine)) interface presents an increased surface potential and quasi-Fermi level splitting, reducing heat generation during device operation at high brightness. The shell-driven carrier engineering strategy reveals that our devices exhibit a high external quantum efficiency of 26.44% and an ultralong operation time (exceeding 50,000 h) to 95% of the initial luminance at 1000 cd/m² (T₉₅@1000 cd/m²). We anticipate that our results provide insights into resolving the issues at the QDHTL interface and demonstrate the importance of carrier management driven by QD nanostructure tailoring for the commercialization of QLEDs.

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纳米壳驱动的大量子点载流子工程实现了超稳定和高效的led

量子点（QD）发光二极管（qled）被认为是下一代照明和显示器最有前途的候选者之一。然而，量子点与空穴输运层（HTL）界面处的次优载流子动力学，如高亮度下电子积累引起的泄漏和猝灭，严重影响了器件的效率和稳定性。本文介绍了纳米壳工程的载流子调制对大尺寸量子点qled的外量子效率（EQE）和工作寿命的影响。壳层驱动的能级位置和能带弯曲工程有效地消除了井眼注入障碍，促进了注入电荷的平衡。光辅助开尔文探针技术表明，ZnCdSe/ZnSeS QD/TFB （TFB =聚（9,9-二辛基芴-co- n -（4-（3-甲基丙基））二苯胺））界面呈现出增加的表面势和准费米能级分裂，减少了器件在高亮度下工作时的热量产生。壳驱动的载流子工程策略表明，我们的器件在1000 cd/m2 （T95@1000 cd/m2）下具有26.44%的高外量子效率和超过50,000 h的超长运行时间，达到初始亮度的95%。我们预计我们的研究结果将为解决QDHTL接口问题提供见解，并证明由QD纳米结构定制驱动的载流子管理对qled商业化的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Research 化学-材料科学：综合

CiteScore

14.30

自引率

11.10%

发文量

2574

审稿时长

1.7 months

期刊介绍： Nano Research is a peer-reviewed, international and interdisciplinary research journal that focuses on all aspects of nanoscience and nanotechnology. It solicits submissions in various topical areas, from basic aspects of nanoscale materials to practical applications. The journal publishes articles on synthesis, characterization, and manipulation of nanomaterials; nanoscale physics, electrical transport, and quantum physics; scanning probe microscopy and spectroscopy; nanofluidics; nanosensors; nanoelectronics and molecular electronics; nano-optics, nano-optoelectronics, and nano-photonics; nanomagnetics; nanobiotechnology and nanomedicine; and nanoscale modeling and simulations. Nano Research offers readers a combination of authoritative and comprehensive Reviews, original cutting-edge research in Communication and Full Paper formats. The journal also prioritizes rapid review to ensure prompt publication.