Efficient Deep-Blue Light-Emitting Diodes from Highly Luminescent Eu 2+ -Doped Alkali Metal Halide Nanocrystals via Lattice Field Modulation.

Autor:	Li X; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Chen X; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Jiang H; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Wang M; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Lin S; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Ma Z; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China.; Laboratory of Zhongyuan Light, School of Physics, Zhengzhou University, 100 Kexue Avenue, Zhengzhou 450001, China., Wang H; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Ji H; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Jia M; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China.; Laboratory of Zhongyuan Light, School of Physics, Zhengzhou University, 100 Kexue Avenue, Zhengzhou 450001, China., Han Y; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Zhu J; State Center for International Cooperation on Designer Low-Carbon & Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, 100 Kexue Avenue, Zhengzhou 450001, China., Pan G; School of Physics and Electronics and Institute of Micro/Nano Photonic Materials and Applications, Henan University, Kaifeng 475004, China., Wu D; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Li X; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Xu W; Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China., Liu Y; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Shan CX; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China., Shi Z; Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China.; Laboratory of Zhongyuan Light, School of Physics, Zhengzhou University, 100 Kexue Avenue, Zhengzhou 450001, China.
Jazyk:	angličtina
Zdroj:	Nano letters [Nano Lett] 2024 Jun 05; Vol. 24 (22), pp. 6601-6609. Date of Electronic Publication: 2024 May 24.
DOI:	10.1021/acs.nanolett.4c01155
Abstrakt:	Lead-halide perovskite nanocrystals (NCs) are promising for fabricating deep-blue (<460 nm) light-emitting diodes (LEDs), but their development is plagued by low electroluminescent performance and lead toxicity. Herein, the synthesis of 12 kinds of highly luminescent and eco-friendly deep-blue europium (Eu 2+ )-doped alkali-metal halides (AX:Eu 2+ ; A = Na + , K + , Rb + , Cs + ; X = Cl - , Br - , I - ) NCs is reported. Through adjustment of the coordination environment, efficient deep-blue emission from Eu-5 d → Eu-4 f transitions is realized. The representative CsBr:Eu 2+ NCs exhibit a high photoluminescence quantum yield of 91.1% at 441 nm with a color coordinate at (0.158, 0.023) matching with the Rec. 2020 blue specification. Electrically driven deep-blue LEDs from CsBr:Eu 2+ NCs are demonstrated, achieving a record external quantum efficiency of 3.15% and half-lifetime of ∼1 h, surpassing the reported metal-halide deep-blue NCs-based LEDs. Importantly, large-area LEDs with an emitting area of 12.25 cm 2 are realized with uniform emission, representing a milestone toward commercial display applications.
Databáze:	MEDLINE
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