DataVXACS Applied Materials & InterfacesPaper
journal article·2024-05-01

Z-Type Ligand Enables Efficient and Stable Deep-Blue Perovskite Light-Emitting Diodes

Yanfeng Chen, Meng Nan, Yanxing He, Shuang Lu, Wei Shen, Gang Cheng, Shufen Chen, Wei Huang

ACS Applied Materials & Interfaces· Volume 16· Issue 17
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Source abstract

Abstract

During the synthesis of deep-blue perovskite quantum dots (PQDs), they generally emerge as a two-dimensional byproduct with poor yield and low photoluminescence quantum yield (PLQY) due to amine ligand enrichment-induced abundant surface defects. Herein, we provide a colloidal synthesis method to prepare deep-blue CsPbBr 3 PQDs in a green nontoxic solvent via strategic Z-type ligand engineering. Z-type ligands of zinc octanoate enable the formation of robust coordination bonds with surface bromide ions of PQDs, maintaining acid–base equilibrium and reducing excess amine enrichment on the PQDs surface. Consequently, homogeneous and monodispersed PQDs with improved PLQY of 73% are successfully synthesized, achieving efficient deep-blue LEDs with a peak EQE of 5.46%, a maximum luminance of 847.6 cd/m 2, and an operational half-lifetime of 14 min. The devices exhibit color coordinates of (0.137, 0.049), closely approximating the Rec. 2020 blue standard. Our work offers a potentially eco-friendly and viable route for realizing high-performance LEDs in the deep-blue region.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Conducting polymers and applications

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

Affiliations

State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China

State Key Laboratory of Synthetic Chemistry, HKU-CAS Joint Laboratory on New Materials, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR China

Frontiers Science Center for Flexible Electronics (FSCFE), MIIT Key Laboratory of Flexible Electronics (KLoFE), Northwestern Polytechnical University, Xi’an 710072, China

Funding

Jiangsu Provincial Department of Education · Natural Science Foundation of Jiangsu Province · International Science and Technology Cooperation Program of Jiangsu Province · National Natural Science Foundation of China · Priority Academic Program Development of Jiangsu Higher Education Institutions · Natural Science Fund for Colleges and Universities in Jiangsu Province

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