Pure-blue emissive ZnSe/CdxZn1−xS/ZnS quantum dots with type-II core-shell structure for display application

IF 9 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Research Pub Date : 2024-11-16 DOI:10.1007/s12274-024-7106-3

Mingrui Liu, Chenhui Wang, Peng Huang, Jinhua He, Muhammad Ramzan, Haizheng Zhong

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引用次数: 0

Abstract

Blue emissive quantum dots are key materials in fabricating quantum-dot light-emitting diodes for display applications. Up to date, most of the previous blue emissive quantum dots are based on quantum dots with type-I core-shell structure. In this work, we report pure-blue emissive ZnSe/Cd_xZn_1−xS/ZnS quantum dots with type-II core-shell structure, which show high photoluminescence quantum yield over 90%. The type-II structure was investigated by applying time-resolved photoluminescence and transient absorption measurements, illustrating the extended photoluminescence decay lifetime of ZnSe/Cd_xZn_1−xS quantum dots as well as the transition of bleaching peak from the valence band of ZnSe to the conduction band of CdZnS. We further fabricated ZnSe/Cd_xZn_1−xS/ZnS quantum dots based electroluminescence devices, achieving a maximum external quantum efficiency of 6.7% and a maximum luminance of 39,766 cd·m⁻².

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具有ii型核壳结构的纯蓝色发光ZnSe/CdxZn1−xS/ZnS量子点用于显示应用

蓝色量子点是制造显示用量子点发光二极管的关键材料。迄今为止，以往的蓝发射量子点大多是基于i型核壳结构的量子点。在这项工作中，我们报道了具有ii型核壳结构的纯蓝色发射ZnSe/CdxZn1−xS/ZnS量子点，其光致发光量子产率超过90%。利用时间分辨光致发光和瞬态吸收测量对ii型结构进行了研究，表明ZnSe/CdxZn1−xS量子点的光致发光衰减寿命延长，漂白峰从ZnSe的价带向CdZnS的导带跃迁。我们进一步制作了基于ZnSe/CdxZn1−xS/ZnS量子点的电致发光器件，最大外量子效率为6.7%，最大亮度为39,766 cd·m−2。

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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.