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

Shikui Han; Xuyong Yang; Yihan Zhu; Chaoliang Tan; Xiao Zhang; Junze Chen; Ying Huang; Bo Chen; Zhimin Luo; Qinglang Ma; Melinda Sindoro; Hao Zhang; Xiaoying Qi; Hai Li; Xiao Huang; Wei Huang; Xiao Wei Sun; Yu Han; Hua Zhang

doi:10.1002/anie.201705617

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

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

Authors

Shikui Han¹, Xuyong Yang², Yihan Zhu³, Chaoliang Tan¹, Xiao Zhang¹, Junze Chen¹, Ying Huang¹, Bo Chen¹, Zhimin Luo¹, Qinglang Ma¹, Melinda Sindoro¹, Hao Zhang⁴, Xiaoying Qi⁵, Hai Li⁴, Xiao Huang⁴, Wei Huang⁴, Xiao Wei Sun^{2

6}, Yu Han³, Hua Zhang¹

Affiliations

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.

PMID: 28675526
DOI: 10.1002/anie.201705617

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 WO_n -WX₂ (n=2.7, 2.9; X=S, Se) heterostructures by sulfurization or selenization of WO_n nanomaterials. The WO_n -WX₂ heterostructures are composed of WO_2.9 nanoparticles (NPs) or WO_2.7 nanowires (NWs) grown together with single- or few-layer WX₂ nanosheets (NSs). As a proof-of-concept application, the WO_n -WX₂ heterostructures are used as the anode interfacial buffer layer for green quantum dot light-emitting diodes (QLEDs). The QLED prepared with WO_2.9 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.

Publication types

Research Support, Non-U.S. Gov't