journal article·2022-03-11

Efficient CsPbBr3 Nanoplatelet-Based Blue Light-Emitting Diodes Enabled by Engineered Surface Ligands

Haoran Wang, Fanghao Ye, Jiayun Sun, Zhaojin Wang, Chen Zhang, Jingyu Qian, Xiaoyu Zhang, Wallace C. H. Choy, Xiao Wei Sun, Kai Wang, Weiwei Zhao

ACS Energy Letters· Volume 7· Issue 3
Publisher page

Abstract

Quantum-confined CsPbBr3 nanoplatelets (NPLs) with very narrow emission line width are promising candidates for color-saturated blue emitters, but their electroluminescence performance is limited by inferior carrier transport, mostly induced by the surface bulky organic ligands. Many efforts routinely rely on replacing long ligands with short counterparts, resulting in a significant increase in the NPL’s thickness and thus making it difficult to obtain the desired emission color. Herein, we realize short-ligand (butylamine and myristic acid)-capped CsPbBr3 NPLs with almost unaltered emission characteristics by introducing ammonium bromide (NH4Br) to effectively control the crystal growth kinetics and passivate the surface defects. Further, with short conjugation ligand–phenethylammonium bromide (PEABr) postsynthetic treatment, we can dramatically enhance their electrical performance and luminous efficiency (film photoluminescence quantum yields over 80%). With these benefits, a remarkable electroluminescence efficiency of 2% (at 463 nm) has been achieved, which is a record for blue perovskite NPL-based light-emitting diodes.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Sauvage Laboratory for Smart Materials, The School of Materials Science and Engineering, and Shenzhen Key Laboratory of Flexible Printed Electronics Technology, Harbin Institute of Technology, Shenzhen 518055, China

Guangdong University Key Lab for Advanced Quantum Dot Displays and Lighting, Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting, and Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China

Key Laboratory of Energy Conversion and Storage Technologies, Southern University of Science and Technology, Ministry of Education, Shenzhen 518055, China

Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China

College of Materials Science and Engineering, Jilin University, Changchun 130012, China

State Key Laboratory of Advanced Welding & Joining, Harbin Institute of Technology, Harbin 150001, China

Funding

Research Grants Council, University Grants Committee · Ministry of Science and Technology of the People's Republic of China · Science, Technology and Innovation Commission of Shenzhen Municipality · National Natural Science Foundation of China · Guangdong Province · Hong Kong Special Administrative Region · Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting, Southern University of Science and Technology

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