Efficient Deep-Blue Light-Emitting Diodes from Highly Luminescent Eu²⁺-Doped Alkali Metal Halide Nanocrystals via Lattice Field Modulation

Nano Letters, Journal Year: 2024, Volume and Issue: 24(22), P. 6601 - 6609

Published: May 24, 2024

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 highly luminescent eco-friendly europium (Eu2+)-doped alkali-metal halides (AX:Eu2+; A = Na+, K+, Rb+, Cs+; X Cl–, Br–, I–) NCs reported. Through adjustment coordination environment, efficient emission from Eu-5d → Eu-4f transitions realized. The representative CsBr:Eu2+ exhibit a high photoluminescence quantum yield 91.1% at 441 nm with color coordinate (0.158, 0.023) matching Rec. 2020 blue specification. Electrically driven LEDs demonstrated, achieving record external efficiency 3.15% half-lifetime ∼1 h, surpassing reported metal-halide NCs-based LEDs. Importantly, large-area an emitting area 12.25 cm2 realized uniform emission, representing milestone toward commercial display applications.

Language: Английский

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Ultra-small cesium silver bismuth bromide quantum dots fabricated by modified hot-injection method for highly efficient degradation of contaminants in organic solvent

Journal of Environmental Sciences, Journal Year: 2024, Volume and Issue: 152, P. 577 - 583

Published: June 15, 2024

Language: Английский

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Thermally Enhanced Self‐Trapped Exciton Emission Based on Thermochromic Ag⁺ doping 0D Zinc‐Based Halides

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(11)

Published: July 3, 2024

Abstract Thermochromic materials, known for their unique ability to change optical properties with temperature, have broad applications, including in thermochromic light‐emitting diodes (LEDs). However, the scarcity of efficient and stable phosphors limits development. In this study, development a novel phosphor based on zero‐dimensional (0D) inorganic metal halides is reported. The 0D Cs 2 ZnBr 4 :Ag + show thermally enhanced self‐trapped exciton (STE) emission across wide temperature range from 120 300 K emitted wavelength changing correspondingly. Temperature‐dependent photoluminescence (PL), time‐resolved PL, density functional theory calculations confirm that STE originates passivated defect/traps assisted energy transfer host STEs formed by [AgBr ] 3– tetrahedron matrix phonons complementing mismatch. Furthermore, reversible LEDs are successfully prepared. Overall, these findings provide future design high‐efficiency luminescent materials pave new way developing LED illumination.

Language: Английский

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Co-doping of Sb³⁺/Ln³⁺ in the Cs₂NaGdCl₆ perovskite leads to efficient energy transfer and single-host white light emission

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(38), P. 15761 - 15767

Published: Jan. 1, 2024

Sb 3+ /Ln co-doped Cs 2 NaGdCl 6 double perovskite was prepared. The energy transfer relationship between and Tb explored. White phosphors with CIE coordinates of (0.34, 0.33) were obtained by introducing Ho into the :Sb ,Tb .

Language: Английский

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Band gap engineering and photoluminescence tuning in halide double perovskites

Dalton Transactions, Journal Year: 2024, Volume and Issue: 53(30), P. 12442 - 12449

Published: Jan. 1, 2024

Halide double perovskites (HDPs) present a convenient alternative to the unstable and toxic lead halide for various optoelectronic applications. Because of their compositional structural tunability, many HDP phases have been synthesized in past decades. While efficient photovoltaic applications remain largely out reach due wide band gaps structures with pseudoisolated metal centers, electronic favor light conversion Since field witnesses rapid growth development, this article is aimed at providing brief snapshot recent advances on all-inorganic HDPs, primarily focusing relationship between compositions optical properties, some aspects visible conversion.

Language: Английский

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Opportunities and challenges of lead-free metal halide perovskites for luminescence

Chemical Science, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 25, 2024

In this review, the preparation methods of LFMHPs are analyzed and discussed. The strategies for improving performance white LEDs based on also demonstrated. Finally, their future challenges perspectives explored.

Language: Английский

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Halogen-Independent Optoelectronic Properties in Copper Halides: A Case Study of K ₂CuX ₃ (X=Cl, Br)

Published: Jan. 1, 2024

Language: Английский

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Multicolor and Multimode Luminescent Lanthanide-Doped Cs2NaInCl6:Sb3+ from Visible to Near Infrared for Versatile Applications

Journal of Luminescence, Journal Year: 2024, Volume and Issue: unknown, P. 120908 - 120908

Published: Sept. 1, 2024

Language: Английский

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Improving photoluminescence properties of lead-free Cs4SnBr6 zero-dimensional perovskite via Mn2+/Sb3+ Co-doping

Journal of Luminescence, Journal Year: 2024, Volume and Issue: unknown, P. 120930 - 120930

Published: Oct. 1, 2024

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Halogen-independent optoelectronic properties in copper halides: A case study of K2CuX3 (X=Cl, Br)

Materials Today Chemistry, Journal Year: 2024, Volume and Issue: 42, P. 102428 - 102428

Published: Nov. 29, 2024

Language: Английский

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