Boosting STE and Nd³⁺ NIR Luminescence in Cs₂AgInCl₆ Double Perovskite via Na⁺/Bi³⁺‐Induced Local Structure Engineering

Advanced Functional Materials, Год журнала: 2023, Номер 33(50)

Опубликована: Авг. 21, 2023

Abstract Currently, lanthanide (Ln 3+ ) doped Pb‐free double perovskites (DPs) suffer from competitive emissions of the self‐trapped exciton (STE) and Ln . Herein, a new type Nd ‐doped Cs 2 AgInCl 6 DPs with Na + /Bi co‐alloying is developed. Benefiting ‐induced local structural modification, both STE broadband visible luminescence near‐infrared (NIR) are boosted via free sensitization. Specifically, total 648‐fold enhancement in emitting intensities compared to ‐free counterpart realized, significantly improved NIR photoluminescence quantum yield (PLQY) 0.16% 30.3%. First‐principles density functional theory calculations, Raman spectra, steady/transient‐state PL spectra verify modification site symmetry, breakdown parity‐forbidden absorption, reduction electron‐phonon coupling doping. Finally, compact vis–NIR light‐emitting diode (LED) designed by Na/Bi/Nd: DP commercial ultraviolet LED chip, which shows promising applications spectroscopic analyses multifunctional lighting.

Язык: Английский

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Near‐Infrared Light Emitting Metal Halides: Materials, Mechanisms, and Applications

Advanced Materials, Год журнала: 2024, Номер 36(21)

Опубликована: Фев. 21, 2024

Near-Infrared (NIR) light emitting metal halides are emerging as a new generation of optical materials owing to their appealing features, which include low-cost synthesis, solution processability, and adjustable properties. NIR-emitting perovskite-based light-emitting diodes (LEDs) have reached an external quantum efficiency (EQE) over 20% device stability 10,000 h. Such results sparked interest in exploring NIR halide emitters. In this review, several different types halides, including lead/tin bromide/iodide perovskites, lanthanide ions doped/based double low dimensional hybrid Bi

Язык: Английский

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Full-color, time-valve controllable and Janus-type long-persistent luminescence from all-inorganic halide perovskites

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Июнь 20, 2024

Abstract Long persistent luminescence (LPL) has gained considerable attention for the applications in decoration, emergency signage, information encryption and biomedicine. However, recently developed LPL materials – encompassing inorganics, organics inorganic-organic hybrids often display monochromatic afterglow with limited functionality. Furthermore, triplet exciton-based phosphors are prone to thermal quenching, significantly restricting their high emission efficiency. Here, we show a straightforward wet-chemistry approach fabricating multimode by introducing both anion (Br − ) cation (Sn 2+ doping into hexagonal CsCdCl 3 all-inorganic perovskites. This process involves establishing new trapping centers from [CdCl 6-n Br n ] 4− and/or [Sn 2-n Cd Cl 9 5− linker units, disrupting local symmetry host framework. These halide perovskites demonstrate duration time ( > 2,000 s), nearly full-color coverage, photoluminescence quantum yield ~ 84.47%), anti-thermal quenching temperature up 377 K. Particularly, : x %Br temperature-dependent time-valve controllable time-dependent luminescence, while %Sn exhibit forward reverse excitation-dependent Janus-type luminescence. Combining experimental computational studies, this finding not only introduces local-symmetry breaking strategy simultaneously enhancing lifetime efficiency, but also provides insights dynamic tunability photonics, high-security anti-counterfeiting storage.

Язык: Английский

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Rare‐Earth‐Based Lead‐Free Halide Double Perovskites for Light Emission: Recent Advances and Applications

Advanced Functional Materials, Год журнала: 2024, Номер 34(44)

Опубликована: Май 22, 2024

Abstract The double perovskite material of Cs 2 NaRECl 6 ‐type, utilizing rare‐earth (RE) ions as trivalent element, has attracted widespread interest due to its unique optoelectronic properties and wide range applications. It displays rich optical properties, including visible infrared light emission through down‐shifting, well up‐conversion radiation‐induced emission. These exceptional make it a promising for devices such detectors, light‐emitting diodes, lasers energy storage batteries but also show advantages in anti‐counterfeiting technology imaging. In this article, the latest progress is reported challenges crystal structure, preparation, performance, various applications lead‐free halide (HLDPs) compounds. This outline prospective research directions existing materials, with aim facilitating discovery new HLDPs materials.

Язык: Английский

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Beyond lead halide perovskites: Crystal structure, bandgaps, photovoltaic properties and future stance of lead-free halide double perovskites

Nano Energy, Год журнала: 2024, Номер 125, С. 109523 - 109523

Опубликована: Март 22, 2024

Язык: Английский

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Cs₂NaGdCl₆:Tb³⁺─A Highly Luminescent Rare-Earth Double Perovskite Scintillator for Low-Dose X-ray Detection and Imaging

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(15), С. 19068 - 19080

Опубликована: Апрель 8, 2024

Rare-earth-based double perovskite (DP) X-ray scintillators have gained significant importance with low detection limits in medical imaging and radiation owing to their high light yield (LY) remarkable spatial resolution. Herein, we report the synthesis of 3D crystals, namely, Cs

Язык: Английский

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Near‐infrared emitting metal halide materials: Luminescence design and applications

InfoMat, Год журнала: 2024, Номер 6(5)

Опубликована: Март 28, 2024

Abstract Near‐infrared (NIR) luminescent metal halide (LMH) materials have attracted great attention in various optoelectronic applications due to their low‐temperature solution‐processable synthesis, abundant crystallographic/electronic structures, and unique properties. However, some challenges still remain luminescence design, performance improvement, application assignments. This review systematically summarizes the development of NIR LMHs through classifying origins into four major categories: band‐edge emission, self‐trapped exciton (STE) ion defect‐related emission. The mechanisms different types are discussed detail by analyzing typical examples. Reasonable strategies for designing optimizing luminescence/optoelectronic properties summarized, including bandgap engineering, self‐trapping state chemical composition modification, energy transfer, other auxiliary such as improvement synthesis scheme post‐processing. Furthermore, prospects based on devices revealed, phosphor‐converted light‐emitting diodes (LEDs), electroluminescent LEDs, photodetectors, solar cells, x‐ray scintillators, well demonstrations related practical applications. Finally, existing future perspectives LMH critically proposed. aims provide general understanding guidance design high‐performance materials. image

Язык: Английский

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Achieving Nearly Quantitative (∼100%) IQE and 42.3% EQE Across NIR‐I and NIR‐II Regions with Cr³⁺‐doped Cs₂NaScCl₆ under 300 nm Excitation

Laser & Photonics Review, Год журнала: 2023, Номер 18(3)

Опубликована: Дек. 10, 2023

Abstract Lead‐free rare‐earth‐based perovskites have received widespread attention for their unique optical properties, although achieving efficient broadband near‐infrared (NIR) emission with these materials remains a challenge. Here the synthesis of rare earth‐based double perovskite (Cs 2 NaScCl 6 ) by an improved solid phase method is reported. The doping Cr 3+ led to formation [CrCl ] 3− octahedron, which exhibited NIR peaked at 950 nm and half‐peak width 162 nm. It worth noting that same actual content, luminous intensity Cs synthesized solid‐phase four times higher than product hydrothermal method. Cl − ‐Cr charge transfer sensitization facilitated localized electrons in octahedron mechanism strong proposed. Calculations based on density functional theory Bader analysis support notion octahedrons are strongly :Cr , conducive –Cr process, resulting internal quantum efficiency 100% external yield as 42.3%. highly ultra‐broadband excellent stability offers many opportunities applications field night vision bio‐imaging.

Язык: Английский

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Multimode Luminescence Tailoring and Improvement of Cs₂NaHoCl₆ Cryolite Crystals via Sb³⁺/Yb³⁺ Alloying for Versatile Photoelectric Applications

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(45)

Опубликована: Сен. 19, 2023

Abstract Lead‐free halide double perovskites are currently gaining significant attention owing to their exceptional environmental friendliness, structural adjustability as well self‐trapped exciton emission. However, stable and efficient perovskite with multimode luminescence tunable spectra still urgently needed for multifunctional photoelectric application. Herein, holmium based cryolite materials (Cs 2 NaHoCl 6 ) anti‐thermal quenching photoluminescence were successfully synthesized. By the further alloying of Sb 3+ ( s ‐ p transitions) Yb f ions, its properties can be modulated, originating from tailoring band gap structure enriching electron transition channels. Upon substitution in Cs , additional absorption peaking at 334 nm results tremendous increase quantum yield (PLQY). Meanwhile, not only typical NIR emission around 980 Ho is enhanced, but also red emissions show a diverse range behaviors. Furthermore, through designing doping, up‐conversion triggered by changing excitation laser power density (yellow‐to‐orange) doping concentration (red‐to‐green). Through combined experimental‐theoretical approach, related mechanism revealed. In general, /Yb abundant energy level ladders constructed more modes derived, demonstrating great potential applications.

Язык: 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, Год журнала: 2023, Номер 14(40), С. 9011 - 9018

Опубликована: Окт. 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.

Язык: Английский

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