Achieving Broadband NIR-I to NIR-II Emission in an All-Inorganic Halide Double-Perovskite Cs₂NaYCl₆:Cr³⁺ Phosphor for Night Vision Imaging

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(33), P. 39550 - 39558

Published: Aug. 10, 2023

Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) offer numerous advantages, including compact size, tunable emission spectra, energy efficiency, and high integration potential. These features make them highly promising for various applications, such as night vision monitoring, food safety inspection, biomedical imaging, theragnostics. All-inorganic halide double-perovskite materials, known their large absorption cross section, excellent defect tolerance, long carrier diffusion radius, serve unique matrices constructing near-infrared fluorescent materials. In this study, we successfully prepared the all-inorganic metal Cs2NaYCl6:Cr3+ using a grinding-sintering method. A small fraction of [YCl6] octahedra within host material's lattice was substituted with Cr3+ ions, resulting in creation phosphor. When excited λ = 310 nm UV light, phosphor exhibited broad range spanning from 800 to 1400 nm, covering NIR-I NIR-II regions. It had bandwidth 185 achieved fluorescence quantum yield 20.2%. The broadband originates weak crystal field environment provided by Cs2NaYCl6 matrix, which enhances luminescence properties ions. To create NIR pc-LEDs, encapsulated onto commercially available LED chip operating at nm. potential application these pc-LEDs imaging validated.

Language: Английский

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Sol-gel combustion synthesis and near-infrared luminescence of Ni2+-doped MgAl2O4 spinel phosphor

Ceramics International, Journal Year: 2024, Volume and Issue: 50(7), P. 12319 - 12325

Published: Jan. 10, 2024

Language: Английский

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Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(14), P. 6555 - 6563

Published: March 26, 2024

Near-infrared (NIR) phosphor conversion light-emitting diodes (pc-LEDs) have great application potential as NIR light sources in many fields such food analysis, night vision illumination, and bioimaging for noninvasive medical diagnosis. In general, phosphors synthesized by a high-temperature solid-phase method large particle sizes to be processed fine powders grinding process, which may introduce surface defects lower the luminous efficiency. Here, we report sol–gel sintering with ammonium nitrate citric acid sacrificing agents synthesize high purity, nanosized (less than 50 nm) Zr4+/Ni2+ codoped MgAl2O4 spinel phosphors, is matrix, Ni2+ center, Zr4+ acts charge compensator. We systematically characterized crystal structures luminescence properties of Ni2+-doped MgAl2O4. Under 390 nm excitation, emission spectrum covers 900–1600 nm, half-peak width 251 peak position located at 1230 nm. demonstrated that incorporating small amounts compensator, intensity was doubled over phosphor. The optimal content compensator 2 mol %. More importantly, inclusion led improved thermal stability properties, measured 100 °C 33.83% room temperature (20 °C). This study demonstrates nanomaterials high-purity enhanced optical can designed through compensation strategy method.

Language: Английский

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Sr2AlTaO6: Ni2+ phosphors with excellent IQE and thermal stability as NIR-II source for night vision, nonvisual detection, and far-field imaging

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: 505, P. 159559 - 159559

Published: Jan. 13, 2025

Language: Английский

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An Er³⁺-Doped Cs₂NaScCl₆ Lead-Free Double Perovskite with Efficient Broadband Visible to Near-Infrared Emission and Multimodal Upconversion Luminescence

The Journal of Physical Chemistry Letters, Journal Year: 2023, Volume and Issue: 14(40), P. 9011 - 9018

Published: Oct. 2, 2023

Lanthanide ions are widely used as dopants for halide perovskites their broad energy level coverage from the visible to near-infrared (NIR) range. In this work, Cs2NaScCl6:Er3+ was synthesized by an improved solid-state reaction method, which showed effective NIR emission under ultraviolet excitation. Through calculations based on density functional theory and Bader charge analysis, it is shown that [ErCl6]3- octahedra show a strong localization effect in lattice, conducive transfer process of Cl-Er3+, sensitization responsible efficient luminescence Er3+, where around λem = 1540 nm originated Er3+:4I13/2 → 4I15/2 transition with ultrahigh photoluminescence quantum yield reached ∼28.3%. Notably, also exhibited bright upconversion green light (at 540 nm) excitation variety laser diodes (808, 980, 1550 via self-sensitization processes.

Language: Английский

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Achieving Multicolor Emitting of Antimony-Doped Indium-Based Halide Perovskite via Monovalent Metal Induced Phase Engineering

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(51), P. 59610 - 59617

Published: Dec. 15, 2023

Lead-free metal halide perovskites have attracted attention because of their excellent optical properties and nontoxicity. Here, we report the synthesis Sb3+-doped indium perovskite Cs2InCl5·H2O:Sb3+ by an improved solution coprecipitation method. The treatment with selected monovalent cation halides led to Cs2MInCl6 (Ag+, K+, Na+) in different crystal structures or phases. Sb3+ has isolated ns2 electron, acts as luminescence center exhibits bright broadband emission that originated from self-trapped excitons. Under UV light excitation, these phosphors emitted multicolored ranging blue, green, yellow, red depending on whether not which ion was used. phosphor samples were used print high-resolution 2D color barcodes for security anticounterfeiting applications. study presented here provides a new approach design lead-free unique properties.

Language: Английский

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Achieving Ultra‐Broadband Near‐Infrared Emission in Cr³⁺‐Activated Cs₂NaScCl₆ Perovskite for Efficient Phosphor‐Converted Light‐Emitting Diodes

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 12(2)

Published: Aug. 26, 2023

Abstract Ultra‐broadband near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) have great application prospects in research and industrial fields. However, simultaneously achieving highly efficient ultra‐broad NIR emission phosphor material remains a challenge. Herein, an ultra‐broadband the range of 800–1200 nm with ultra‐high efficiency up to 64.2% is first achieved by substituting Sc 3+ site Cs 2 NaScCl 6 perovskite single‐crystal Cr ion. By combining experimental results first‐principles calculations, charge transfer sensitization process from host found be fundamental reason for efficiency. Benefiting excellent superior chemical resistance heat UV radiation, pc‐LED made this demonstrates potential biomedical imaging, nondestructive testing, night‐vision devices.

Language: Английский

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Effect of concentration of Er³⁺ on up‐conversion luminescence in NaYF₄ containing oxy‐fluoride glass‐ceramics

Journal of the American Ceramic Society, Journal Year: 2024, Volume and Issue: 107(8), P. 5482 - 5489

Published: April 4, 2024

Abstract The color of micro‐structured glass can be tuned by adjusting the cross‐relaxation between Er 3+ ions through mechanism up‐conversion, although range change is very limited. Here, we report simple and reproducible synthesis transparent oxy‐fluoride glass‐ceramics co‐doped with Yb /Er melting secondary heat treatment. By doping content from 0.2 to 10 mol%, followed treatment, intensity up‐conversion luminescence under 980 nm laser excitation was increased more than 100 times, showed an content‐depended green light red light. elemental analysis TEM–EDS mapping measurement lifetime suggest that changes in principal behind luminescence. As a result, emission due electronic transition 4 F 9/2 much greater ( S 3/2 ). Therefore, present strategy achieve efficient broad tunability high purity.

Language: Английский

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High performance NIR-I to NIR-II emission of a Cr³⁺-doped Cs₂NaLuCl₆ phosphor with an IQE and EQE of up to 92.9% and 60.75%

Inorganic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

We developed a Cr 3+ -doped Cs 2 NaLuCl 6 by grinding–sintering method, which exhibited emission peaked at around 960 nm, with FWHM of ∼182 and the IQE EQE optimized phosphor were as high ∼92.9% ∼60.75%, respectively.

Language: Английский

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Synthesis and Photoluminescence Modulation of Cs₄Cd_1–xMn_xBi₂Cl₁₂-Based Two-Dimensional Layered Double Perovskites

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(42), P. 17382 - 17389

Published: Oct. 10, 2023

Two-dimensional (2D) layered double perovskites have attracted much attention because of their excellent photoelectric properties. However, few reports been published on the synthesis 2D from halide as precursors. Here, we report that CsCdCl3 and Cs3Bi2Cl9 were synthesized by coprecipitation method, a two-dimensional perovskite Cs4CdBi2Cl12 was readily mixing two perovskites. We doped different amounts Mn2+ into to form CsCd1–xMnxCl3, which introduced impurity states energy level exhibited an orange-red light emission is characteristic Mn2+. A series Cs4Cd1–xMnxBi2Cl12 CsCd1–xMnxCl3 Cs3Bi2Cl9, showed bright orange-yellow luminescence under ultraviolet excitation. The presence high concentrations Cd2+ in weakened strong Mn–Mn coupling suppressed transfer defects, thus minimizing nonradiative decay promoting efficient transfer. Our work provides new concept for low-dimensional metal with unique optical

Language: Английский

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