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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A Nickel-doped, lanthanum gallium germanate-based phosphor as an ultra-broadband short-wavelength infrared region emitter for optical imaging

Ceramics International, Journal Year: 2024, Volume and Issue: 50(13), P. 23685 - 23693

Published: April 10, 2024

Language: Английский

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Long-Wavelength Near-Infrared MgIn₂O₄:Ni²⁺ Phosphor with 47.93% IQE and 34.66% EQE for Night Vision Lighting, Nonvisual Detection, and Biological Imaging

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(10), P. 4555 - 4563

Published: Sept. 3, 2024

Presently, there are very limited options for a broad-band long-wavelength near-infrared phosphor-converted light-emitting diode (LWNIR pc-LED) with wavelengths above ∼1500 nm, and most LWNIR phosphors have low luminescence quantum efficiency. Here, Ni2+-doped MgIn2O4 antispinel were prepared by high-temperature solid-state reaction method. Under 365 nm excitation, they exhibited emission in the range of 1200–2100 an peak ∼1490 full width at half-maximum ∼313 indicating weak crystal field environment high electron polarization around center [MgO6] octahedron. The IQE EQE MgIn2O4:Ni2+ ∼47.93% ∼34.66%, respectively. optimized phosphor was encapsulated LED chip to obtain pc-LED device night vision lighting, nonvisual detection, biological imaging. Our results confirmed that lighting based imaging technology showed clear safety advantages over traditional high-energy ray

Language: Английский

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The synthesis and application of Ni2+-doped NIR-II Phosphors composed of MgAl2-xGaxO4 solid-solution

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1005, P. 175914 - 175914

Published: Aug. 8, 2024

Language: Английский

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Long-wavelength near-infrared light emitting Ni²⁺-doped double perovskite molybdate-based solid-solution phosphors

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

We developed Ni 2+ -doped (Sr/Ba) 2 MgMoO 6 double perovskite molybdate-based solid-solution long wavelength near-infrared luminescence (1000–2000 nm) phosphors, which shiftss in the range of 1400–1610 nm by simple adjustment Sr/Ba ratio.

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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Cr³⁺-Doped LiAlO₂ NIR-I Emitting Phosphors with Superior Resistance to Thermal Quenching for Night Vision Monitoring and Bioimaging

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(44), P. 60599 - 60607

Published: Oct. 22, 2024

Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) as a new NIR light source has outstanding application potential in the fields of spectroscopy analysis, sensing, imaging, and pattern recognition. Therefore, development phosphors with good luminescence thermal stability attracted much attention. To this end, we developed LiAlO2:Cr3+ garnet-type by high-temperature solid-state reaction method. Under 405 nm excitation, Cr3+ ions located tetrahedrons LiAlO2 emit emission broadband that covers 650-900 mixed several sharp narrowband R-line emissions, which showed excellent integrated intensity measured at 573 K is ∼90.86% 303 caused structural rigidity low expansion coefficient matrix material. An pc-LED device assembled optimized commercially available purple LED chip emitted output power ∼98.172 mW driving current 300 mA demonstrated an electro-optical conversion efficiency ∼9.09%, while it night vision monitoring biomedical imaging.

Language: Английский

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Antithermal-Quenching Near-Infrared Emitting Lu₂SrAl₄SiO₁₂:Cr³⁺ Garnet-Type Phosphor for High-Resolution Nonvisual Imaging

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(46), P. 63831 - 63839

Published: Nov. 12, 2024

Near-infrared (NIR) light allows fast and nondestructive detection with deep penetration into biological tissues is widely used in food inspection, biomedical imaging, night vision security, other fields. Cr3+-doped NIR first region (NIR-I) phosphors have many interesting features that attracted a lot of attention recently. However, practical issues, such as low photoluminescence quantum efficiency poor thermal stability, need to be addressed. We synthesized Lu2SrAl4SiO12 garnet-type using high-temperature solid-state reaction method. Under blue-light (@ 430 nm) excitation, the exhibited broadband NIR-I emission range 600–1000 nm, an peak at 710 nm. This system unique, had multipeak sharp-line superposition Cr3+ ions were situated relatively strong crystal field environment, opposed weak environment for matrix. The optimal doping content was 2 mol %, its internal ∼76.8%. Surprisingly, this phosphor showed antithermal quenching effect, integrated luminescence intensity measured 573 K 206.3% 303 K. found caused by extremely expansion coefficient rigid structure matrix temperature range, well weakening electron–phonon coupling increasing temperature. optimized packaged blue chip phosphor-converted light-emitting diode device. source device output power 119.02 mW electro-optical conversion 11.02% under driving current 300 mA. application potential demonstrated high-resolution imaging.

Language: Английский

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