Efficient Large‐Area (81 cm²) Ternary Copper Halides Light‐Emitting Diodes with External Quantum Efficiency Exceeding 13% via Host‐Guest Strategy

Advanced Materials, Год журнала: 2024, Номер 36(29)

Опубликована: Май 2, 2024

Ternary copper (Cu) halides are promising candidates for replacing toxic lead in the field of perovskite light-emitting diodes (LEDs) toward practical applications. However, electroluminescent performance Cu halide-based LEDs remains a great challenge due to presence serious nonradiative recombination and inefficient charge transport halide emitters. Here, rational design host-guest [dppb]

Язык: Английский

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Color-Tunable CsCdCl₃ Perovskite for Low-Temperature Anticounterfeiting and Information Storage Applications

Inorganic Chemistry, Год журнала: 2024, Номер 63(34), С. 16047 - 16055

Опубликована: Авг. 14, 2024

Low-temperature anticounterfeiting technologies play a crucial role in ensuring the authenticity and integrity of temperature-sensitive products such as vaccines, pharmaceuticals, food items. In this work, low-temperature route based on differentiated photoluminescence (PL), PersL, thermally stimulated luminescence (TSL) behaviors metal halide perovskite, pure CsCdCl3, CsCdCl3:10% Te4+ is proposed. The CsCdCl3 host exhibits pronounced color shifts, encompassing PL, TSL behaviors, ranging from blue to yellow orange temperature rises 100 K room temperature. This change attributed luminous center (from D3d octahedron C3v octahedron). Conversely, addition inhibits matrix emission, maintains characteristic emission Te4+, regulates trap distribution at low TL intensity. work highlights significant promise phosphors innovative technologies, especially for cold-chain vaccine safety monitoring.

Язык: Английский

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Efficient non-doped cluster light-emitting diodes based on semiconducting copper iodide hybrids

Journal of Luminescence, Год журнала: 2024, Номер 271, С. 120609 - 120609

Опубликована: Апрель 4, 2024

Язык: Английский

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

Laser & Photonics Review, Год журнала: 2024, Номер 18(11)

Опубликована: Июль 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.

Язык: Английский

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Modification of Cs₂AgBiCl₆ Double-Perovskite Photocatalytic Activity by Br Doping

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Фев. 24, 2025

Developing highly efficient photocatalysts is crucial for photocatalysis technology. Many reports have demonstrated that element doping was an effective strategy developing by broadening the visible light absorption range and suppressing recombination of photogenerated carriers. Herein, we doped Br into Cs2AgBiCl6 perovskite to widen enhance charge transfer ability then developed a visible-light photocatalyst based on Cs2AgBiCl6. The results showed could not only broaden samples but also modulate significantly. Among all as-prepared samples, Cs2AgBiCl4Br2 has highest photocatalytic activity due best ability, long lifetime carriers, broadened range, which can degrade 99.9% methyl red in 28 min. Moreover, cyclic experiments demonstrate good cycle stability. This study provide promising designing new, halide photocatalysts.

Язык: Английский

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Realization of blue-white light emission in Zn2+-doped CsCdCl3 metal halides

Materials Today Chemistry, Год журнала: 2025, Номер 46, С. 102725 - 102725

Опубликована: Апрель 29, 2025

Язык: Английский

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Cryogenic Charging and Discharging Kinetics of a Photostimulable Phosphor: Low Charge Rates at Low Temperatures

The Journal of Physical Chemistry Letters, Год журнала: 2025, Номер unknown, С. 4828 - 4834

Опубликована: Май 8, 2025

Phosphors that exhibit photostimulated luminescence (PSL), i.e., photostimulable phosphors, possess intrinsic memory. This property has been leveraged historically in optical sensors and imaging devices more recently toward computing. Heretofore, it was unclear whether all-optical PSL effectively manifests at very low temperatures. Herein we characterized the charging discharging kinetics of an ideal two-level phosphor (RbCdF3:Mn) from ambient to cryogenic temperatures (11 K). While persists temperatures, efficiency decreases significantly. The inhibition is quantitatively described by using adapted model incorporating a weakly bound (31 meV) excitonic state. When extended include high-temperature thermal ionization effects, charge/discharge anti-thermal quenching are with high fidelity. can be describe other persistent phosphors luminescent electron donor (e.g., Bi3+, Pr3+, Cr3+, Mn2+).

Язык: Английский

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Ag Doping Triggered Electronic Structural Engineering in Halide Quadruple Perovskite Toward Near‐Unity Luminescence Quantum Yield

Laser & Photonics Review, Год журнала: 2025, Номер unknown

Опубликована: Май 19, 2025

Abstract Ion doping is an effective strategy to regulate the optical performance in metal halide perovskites for desirable light emission manipulations. In this work, a Mn 2+ and Ag + co‐doping utilized improve luminescence Cs 4 CdBi 2 Cl 12 quadruple perovskite. ions are proven be incorporated into lattice. occupy Cd sites or vacancies. The alloyed bring efficient orange‐red attributed energy transfer process from host ions. A small amount of can optimize band structure increase exciton binding energy, thus promoting radiative recombination d–d transition boosting PLQY up 94.6%. Furthermore, 0.75 0.25 Bi :1.5%Ag show good phase stability ambient environment employed white light‐emitting diodes with commercial blue green phosphors on near‐ultraviolet LED chip. This work provides insights understanding composition‐structure‐property relationship vacancy‐ordered designing highly luminescent lead‐free halides solid‐state emitting applications.

Язык: Английский

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Enhanced afterglow blue emissions from atomically confined excitons in Pb(II)-doped cadmium-based metal halides

Applied Physics Letters, Год журнала: 2024, Номер 125(25)

Опубликована: Дек. 16, 2024

All-inorganic metal halide perovskites possess significant potentiality in lighting, bioimaging, and optical anti-counterfeiting due to their exceptional unique properties. However, the exploration of efficient, robustly stable, long-persistent luminescent blue light-emitting materials poses huge challenges, especially understanding electronic structure photophysical processes. In this work, high-purity Pb2+-doped CsCdCl3 crystals were synthesized using a straightforward hydrothermal method. Parts Pb2+ ions replaced partial Cd2+ sites face-sharing octahedra formed atomically confined excitons around Pb(II) octahedra. This exciton could emit light (423 nm) at room temperature with an enhanced radiation transition probability nearly 90% quantum yield. The incorporation formation not only shifted emission color region from weak orange strong but also exhibited intrinsic afterglow behavior as perovskite. Raman spectra TL indicated polaronic states corresponding A1g 244 cm−1 phonon mode coupling electron, which dominated processes undoped doped CsCdCl3. These findings facilitate dopant dominant centers tune semiconductors, unveiling nature phenomena material, find applications devices.

Язык: Английский

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Anomalous excitation wavelength dependent photoluminescence of Sb3+/Bi3+ co-doped double perovskites

Applied Physics Letters, Год журнала: 2024, Номер 125(24)

Опубликована: Дек. 9, 2024

Lead-free double perovskites have recently attracted lots of research interest due to their enhanced structural stability and decreased toxicity compared lead-halide perovskites. However, origins the dual emissions observed in photoluminescence (PL) are still controversial. Herein, PL properties Sb/Bi co-doped Cs2NaInCl6 microcrystals investigated. When excitation wavelength is about 320–360 nm, emission peak mainly locates at 450 nm. While excited 250 reversely increases ∼580 According Stokes shift, bandwidth, spectra, lifetime, temperature dependent PL, 580 nm attributed recombination free exciton (FE) self-trapped (STE), respectively. Only when photon energy large enough generate lattice distortion create excitons simultaneously does STE form, exhibiting As increases, becomes insufficient for formation but able FEs. Thus, dominated by FE recombination. Therefore, position observed. Moreover, we demonstrate an anti-counterfeiting pattern with color, which cannot be imitated other luminescent materials, implying improved security.

Язык: Английский

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