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Angew Chem Int Ed Engl. 2017 Aug 21;56(35):10486-10490. doi: 10.1002/anie.201705617. Epub 2017 Jul 24.

Synthesis of WOn -WX2 (n=2.7, 2.9; X=S, Se) Heterostructures for Highly Efficient Green Quantum Dot Light-Emitting Diodes.

Author information

1
Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
2
Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
3
Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia.
4
Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 5 Xinmofan Road, Nanjing, 210009, China.
5
Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore, 638075, Singapore.
6
Department of Electrical and Electronic Engineering, College of Engineering, Southern, University of Science and Technology, 1088 Xue-Yuan Road, Nanshan, Shenzhen, Guangdong, 518055, China.

Abstract

Preparation of two-dimensional (2D) heterostructures is important not only fundamentally, but also technologically for applications in electronics and optoelectronics. Herein, we report a facile colloidal method for the synthesis of WOn -WX2 (n=2.7, 2.9; X=S, Se) heterostructures by sulfurization or selenization of WOn nanomaterials. The WOn -WX2 heterostructures are composed of WO2.9 nanoparticles (NPs) or WO2.7 nanowires (NWs) grown together with single- or few-layer WX2 nanosheets (NSs). As a proof-of-concept application, the WOn -WX2 heterostructures are used as the anode interfacial buffer layer for green quantum dot light-emitting diodes (QLEDs). The QLED prepared with WO2.9 NP-WSe2 NS heterostructures achieves external quantum efficiency (EQE) of 8.53 %. To our knowledge, this is the highest efficiency in the reported green QLEDs using inorganic materials as the hole injection layer.

KEYWORDS:

light-emitting diodes; quantum dots; selenium; sulfur; tungsten

PMID:
28675526
DOI:
10.1002/anie.201705617

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