Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(40)

Published: July 10, 2021

Abstract Luminescent metal halide materials with flexible crystallography/electronic structures and tunable emission have demonstrated broad application prospects in the visible light region. However, designing near‐infrared (NIR) light‐emitting halides remains a challenge. Here, an enlightening prototype is proposed to explore high‐efficiency broadband NIR systems by incorporating Sb 3+ into Cs 2 ZnCl 4 matrix. Combined experimental analysis density functional theory calculations reveal modified self‐trapped excitons model elaborate emission. The high photoluminescence quantum yield of 69.9% peaking at 745 nm large full width half maximum 175 nm, along excellent air/thermal stability, show unique advantages lead‐free :Sb as source. substitution Cl − Br further enables red‐shift peak from 823 nm. diode device based on demonstrates potential non‐visible source night vision. This study puts forward effective strategy design novel eco‐friendly emissive provides guidance for expanding scope luminescent halides.

Language: Английский

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Seed‐Crystal‐Induced Cold Sintering Toward Metal Halide Transparent Ceramic Scintillators

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(17)

Published: March 1, 2022

Scintillators with high spatial resolution at a low radiation dose rate are desirable for X-ray medical imaging. To challenge the state-of-art technology, it is necessary to design large-area wafers light yield, oriented transport, and reduced scattering. Here, seed-crystal-induced cold sintering adopted <001>-textured TPP2 MnBr4 (TPP: tetraphenylphosphonium) transparent ceramic fabricated wafer of 5 cm in diameter, exhibiting optical transparency above 68% over 450-600 nm range. The compelling scintillation performance includes yield ≈78 000 ± 2000 photons per MeV, detection limit 8.8 nanograys second, about 625 times lower than requirement diagnostics (5500 second), an energy 17% high-energy γ-rays (662 keV). imaging demonstrates 15.7 lp mm-1 . Moreover, designed material exhibits good retention radioluminescence intensity yield. This work presents paradigm achieving light-guiding properties fabrication by grain orientation engineering, transparent, textured metal halide scintillator expected provide route advancement tomorrow.

Language: Английский

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Ultra-Broad-Band-Excitable Cu(I)-Based Organometallic Halide with Near-Unity Emission for Light-Emitting Diode Applications

Chemistry of Materials, Journal Year: 2021, Volume and Issue: 33(12), P. 4382 - 4389

Published: June 2, 2021

Low-dimensional hybrid metal halides demonstrate broad-band emission and high photoluminescence quantum yield (PLQY) acting as excellent candidates for a new generation of luminescent materials in lighting fields. However, most can only be excited by ultraviolet radiation, the discovery high-efficient emitters with excitation characteristics, especially upon efficient blue light irradiation, is challenge. Herein, zero-dimensional (0D) Cu(I)-based organometallic halide (18-crown-6)2Na2(H2O)3Cu4I6 (CNCI) was prepared green band centered at 536 nm near-unity PLQY (91.8%) 450 nm. Importantly, ultrabroad covering 300–500 range observed CNCI, luminescence mechanism has been discussed detail. A white light-emitting diode (WLED) fabricated luminous efficiency 156 lm/W color rendering index 89.6. This work provides guidance designing high-performance suitable characteristics also promotes application prospects such WLED

Language: Английский

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Dual‐Band‐Tunable White‐Light Emission from Bi³⁺/Te⁴⁺ Emitters in Perovskite‐Derivative Cs₂SnCl₆ Microcrystals

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(9)

Published: Jan. 4, 2022

Luminescent metal halides have attracted considerable attention in next-generation solid-state lighting because of their superior optical properties and easy solution processibility. Herein, we report a new class highly efficient dual-band-tunable white-light emitters based on Bi3+ /Te4+ co-doped perovskite derivative Cs2 SnCl6 microcrystals. Owing to the strong electron-phonon coupling energy transfer from Te4+ , microcrystals exhibited broad dual-band emission originating inter-configurational 3 P0,1 →1 S0 transitions with good stability high photoluminescence (PL) quantum yield up 68.3 %. Specifically, remarkable transition -PL lifetime milliseconds at 10 K microseconds 300 was observed, as solid evidence for isolated emission. These findings provide not only insights into excited-state dynamics but also general approach achieve single-composition lead-free through ns2 -metal ion co-doping.

Language: Английский

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Efficient Near‐Infrared Luminescence in Lanthanide‐Doped Vacancy‐Ordered Double Perovskite Cs₂ZrCl₆ Phosphors via Te⁴⁺ Sensitization

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(26)

Published: April 19, 2022

All-inorganic lead-free perovskite-derivative metal halides have shown great promise in optoelectronics, however, it remains challenging to realize efficient near-infrared (NIR) luminescence these materials. Herein, we report a novel strategy based on Te4+ /Ln3+ (Ln=Er, Nd, and Yb) co-doping achieve NIR vacancy-ordered double perovskite Cs2 ZrCl6 phosphors, which are excitable by low-cost near-ultraviolet light-emitting diode (LED) chip. Through sensitization the spin-orbital allowed 1 S0 →3 P1 transition of , intense multi-wavelength originating from 4f→4f transitions Er3+ Nd3+ Yb3+ was acquired, with quantum yield 6.1 % for emission. These findings provide general approach emission through ns2 -metal lanthanide ion co-doping, thereby opening up new avenue exploring NIR-emitting derivatives towards versatile applications such as NIR-LEDs bioimaging.

Language: Английский

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High-performance CsPbBr3@Cs4PbBr6/SiO2 nanocrystals via double coating layers for white light emission and visible light communication

eScience, Journal Year: 2022, Volume and Issue: 2(6), P. 646 - 654

Published: Nov. 1, 2022

Owing to their outstanding optoelectronic properties, all-inorganic CsPbBr3 perovskite nanocrystals (NCs) are regarded as excellent materials for various applications. Unfortunately, practical applications limited by poor stability against water, heat, and polar solvents. Here, we propose a facile synthesis strategy CsPbBr3@Cs4PbBr6 NCs via tetraoctylammonium bromide ligand induction at room temperature. The resulting show high photoluminescence quantum yield of 94%. In order prevent Cs4PbBr6 from being converted back when exposed second coating layer SiO2 is formed on the surface hydrolysis tetramethoxysilane. CsPbBr3@Cs4PbBr6/SiO2 with double structure have not only solvent (ethanol) but also water heat. as-prepared serve green emitters in efficient white light-emitting diodes (WLEDs) color rendering index (CRI) 91 power efficiency 59.87 lm W−1. Furthermore, use these WLEDs visible light communication (VLC) results maximum rate 44.53 Mbps, suggesting great potential reported methods solid-state illumination VLC.

Language: Английский

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Mn²⁺‐Based Luminescent Metal Halides: Syntheses, Properties, and Applications

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(15)

Published: May 23, 2023

Abstract Lead‐free metal halides are considered a new generation of optoelectronic materials due to their low toxicity, superior properties, ease synthesis, structural diversity, and cost. In particular, Mn 2+ ‐based have earned intensive attention owing high emission quantum efficiency, rich physical properties (e.g., triboluminescence stimuli‐responsivity), cost, toxicity. Due the different coordination environments ions, can exhibit green, red, near‐infrared emissions. This review summarizes recent progress in synthesis methods, mechanisms, photophysical representative applications X‐ray scintillations, white light‐emitting diodes, optical anti‐counterfeiting technologies, fluorescent sensors. Finally, challenges potential research directions toward developing also predicted.

Language: Английский

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Metal halide perovskite nanocrystals for biomedical engineering: Recent advances, challenges, and future perspectives

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 482, P. 215073 - 215073

Published: Feb. 17, 2023

Language: Английский

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Spinel ferrites/metal oxide nanocomposites for waste water treatment

Applied Physics A, Journal Year: 2023, Volume and Issue: 129(2)

Published: Jan. 10, 2023

Language: Английский

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Suppressed Self‐Reduction of Manganese in Mg₂SnO₄ via Li⁺ Incorporation with Polychromatic Luminescence for Versatile Applications

Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 17(4)

Published: Feb. 7, 2023

Abstract Herein, the self‐reduction behavior of manganese (Mn) in Mg 2 SnO 4 (MSO) host lattices prepared by using solid‐state reaction technique air atmosphere is reported. Excited 282 nm, only emission Mn 2+ seen, and observed results are confirmed theoretical calculation based on density functional theory. Noteworthy, with codoping Li + , process suppressed, leading to coexistence 4+ MSO along multicolor emissions. For suppressed behavior, possible hypotheses proposed elucidate corresponding mechanisms. Furthermore, benefiting from different thermal quenching behaviors ratiometric optical thermometers high sensitivity 6.59% K −1 designed. Moreover, phosphors possess a good green afterglow phenomenon, which their trap depth 0.71 0.91 eV. In addition, via designed phosphors, applications anti‐counterfeiting, fingerprint identification, information storage also realized.

Language: Английский

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