journal article·2020-03-13

Chlorine Vacancy Passivation in Mixed Halide Perovskite Quantum Dots by Organic Pseudohalides Enables Efficient Rec. 2020 Blue Light-Emitting Diodes

Xiaopeng Zheng, Shuai Yuan, Jiakai Liu, Jun Yin, Fanglong Yuan, Wan-Shan Shen, Kexin Yao, Mingyang Wei, Chun Zhou, Kepeng Song, Bin-Bin Zhang, Yuanbao Lin, Mohamed Nejib Hedhili, Nimer Wehbe, Yu Han, Hong-Tao Sun, Zheng-Hong Lu, Thomas D. Anthopoulos, Omar F. Mohammed, Edward H. Sargent, Liang-Sheng Liao, Osman M. Bakr

ACS Energy Letters· Volume 5· Issue 3
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Abstract

Blue-emitting perovskites can be easily attained by precisely tuning the halide ratio of mixed halide (Br/Cl) perovskites (MHPs). However, the adjustable halide ratio hinders the passivation of Cl vacancies, the main source of trap states leading to inferior performance of blue MHP light-emitting diodes (LEDs). Here, we report a strategy for passivating Cl vacancies in MHP quantum dots (QDs) using nonpolar solvent-soluble organic pseudohalide [n-dodecylammonium thiocyanate (DAT)], enabling blue MHP LEDs with greatly enhanced efficiency. Density functional theory calculations reveal that the thiocyanate (SCN–) groups fill in the Cl vacancies and remove electron traps within the bandgap. DAT-treated CsPb(BrxCl1–x)3 QDs exhibit near unity (∼100%) photoluminescence quantum yields, and their blue (∼470 nm) LEDs are spectrally stable with an external quantum efficiency of 6.3%, a record for perovskite LEDs emitting in the range of 460–480 nm relevant to Rec. 2020 display standards, and a half-lifetime of ∼99 s.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties

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

Affiliations

Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China

Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 3G4, Canada

Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), KAUST Solar Center, Thuwal 23955-6900, Saudi Arabia

Imaging and Characterization Core Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia

Funding

Collaborative Innovation Center of Suzhou Nano Science and Technology · Ontario Research Foundation · King Abdullah University of Science and Technology · Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada · National Natural Science Foundation of China

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