Recent advances in the design of afterglow materials: mechanisms, structural regulation strategies and applications

Chemical Society Reviews, Год журнала: 2023, Номер 52(22), С. 8005 - 8058

Опубликована: Янв. 1, 2023

Afterglow materials have attracted widespread attention owing to their distinctive and long-lived optical emission properties which create exciting opportunities in various fields.

Язык: Английский

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High‐Efficiency and Stable Long‐Persistent Luminescence from Undoped Cesium Cadmium Chlorine Crystals Induced by Intrinsic Point Defects

Advanced Science, Год журнала: 2023, Номер 10(15)

Опубликована: Фев. 24, 2023

Abstract Application of long‐persistent luminescence (LPL) materials in many technological fields is the spotlight. However, exploration undoped persistent luminescent with high emission efficiency, robust stability, and long duration remains challenging. Here, inorganic cesium cadmium chlorine (CsCdCl 3 ) developed, featuring remarkable LPL characteristics at room temperature, which synthesized by a facile hydrothermal method. Excited ultraviolet light, CsCdCl crystals exhibit an intense yellow large photoluminescence quantum yield ≈90%. Different from reported systems lanthanides or transition metals doping, without dopants perform 6000 s. Joint experiment‐theory characterizations reveal intrinsic point defects act as trap centers excited electrons carrier de‐trapping process such sites to localized contributes LPL. Encouraged attractive fluorescence well good stability against environment oxygen/moisture (75%), heat (100 °C for 10 h), light irradiation, effective dual‐mode information storage‐reading application demonstrated. The results open up new frontier exploring provide opportunity advanced storage compatible practical applications.

Язык: Английский

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The Role of Point Defects in Heterojunction Photocatalysts: Perspectives and Outlooks

Advanced Functional Materials, Год журнала: 2024, Номер 34(48)

Опубликована: Июль 22, 2024

Abstract The development of efficient photocatalysts is a mainstay for the advancement photocatalytic technology. Heterojunction can overcome inherent limitations single photocatalysts, integrating advantages each component, and achieving separation photogenerated charges, making them research focus in field photocatalysis. role point defects reactions diverse significantly influence performance photocatalysts. This review comprehensively summarizes latest advancements defect engineering modulation heterojunction First, types their impact on processes are introduced. Subsequently, common presented. Then, accordance with recent progress, regulatory mechanisms within outlined, particular functions surface/interfacial properties charge transfer processes. Finally, challenges faced by optimizing promising solutions proposed. provides an in‐depth understanding expectation offering insights into highly active materials.

Язык: Английский

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Self‐Trapped Excitons‐Based Warm‐White Afterglow by Room‐Temperature Engineering toward Intelligent Multi‐Channel Information System

Advanced Functional Materials, Год журнала: 2023, Номер 34(4)

Опубликована: Окт. 20, 2023

Abstract In the era of intelligence, output colors foundational phosphors are expected to be controlled by programs, while current activators‐determined afterglow candidates with fixed spectral channel have limitations in creating customized colors. Here, a long‐lived warm‐white emission is successfully demonstrated originating from self‐trapped excitons (STEs) non‐toxic Cs 2 NaInCl 6 :Ag,Bi, ranging 400 850 nm, which color can easily using filters. This investigation indicates that 3% Ag alloying breaks dark STEs and introduces traps for efficient afterglow, Bi doping further improves quantum yield ≈100% greatly enhances ≈100‐fold compared initial intensity, allowing an impressive persistence over 20,000 s. Intriguingly, defect bands Jahn‐Teller distortions prolonged hundreds femtoseconds several hours, they first detected steady‐state absorption spectra after cessation excitation sources, contributing concluded dynamic model STEs. And its intelligent application corroborated designed multi‐channel information system. These findings offer novel scheme understanding luminescence supply exemplification designing white phosphors.

Язык: Английский

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Efficient Deep-Blue Light-Emitting Diodes from Highly Luminescent Eu²⁺-Doped Alkali Metal Halide Nanocrystals via Lattice Field Modulation

Nano Letters, Год журнала: 2024, Номер 24(22), С. 6601 - 6609

Опубликована: Май 24, 2024

Lead-halide perovskite nanocrystals (NCs) are promising for fabricating deep-blue (<460 nm) light-emitting diodes (LEDs), but their development is plagued by low electroluminescent performance and lead toxicity. Herein, the synthesis of 12 kinds highly luminescent eco-friendly europium (Eu2+)-doped alkali-metal halides (AX:Eu2+; A = Na+, K+, Rb+, Cs+; X Cl–, Br–, I–) NCs reported. Through adjustment coordination environment, efficient emission from Eu-5d → Eu-4f transitions realized. The representative CsBr:Eu2+ exhibit a high photoluminescence quantum yield 91.1% at 441 nm with color coordinate (0.158, 0.023) matching Rec. 2020 blue specification. Electrically driven LEDs demonstrated, achieving record external efficiency 3.15% half-lifetime ∼1 h, surpassing reported metal-halide NCs-based LEDs. Importantly, large-area an emitting area 12.25 cm2 realized uniform emission, representing milestone toward commercial display applications.

Язык: Английский

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Enabling Multimodal Luminescence in a Single Nanoparticle for X-ray Imaging Encryption and Anticounterfeiting

Nano Letters, Год журнала: 2024, Номер 24(31), С. 9691 - 9699

Опубликована: Июль 25, 2024

Multimodal luminescent materials hold great promise in a diversity of frontier applications. However, achieving the multimodal responsive luminescence at single nanoparticle level, especially besides light stimuli, has remained challenge. Here, we report conceptual model to realize by constructing both mechanoluminescence and photoluminescence nanoparticle. We show that lanthanide-doped fluoride nanoparticles are able produce excellent through X-ray irradiation, color-tunable becomes available selecting suitable lanthanide emitters core–shell–shell structure. Furthermore, design multilayer core–shell nanostructure enables emissions including radioluminescence, persistent luminescence, mechanoluminescence, upconversion, downshifting, thermal-stimulated simultaneously under multichannel excitation stimuli. These results provide new insights into mechanism induced nanocrystals contribute development smart toward imaging encryption, stress sensing, anticounterfeiting.

Язык: Английский

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Modulation of trap distribution by optimizing Mn2+ doping in CsCdCl3 crystals toward enhanced afterglow performance

Applied Physics Letters, Год журнала: 2024, Номер 124(9)

Опубликована: Фев. 26, 2024

Exploring efficient and stable long-persistent luminescence (LPL) materials is of great value for promoting their advanced applications. Here, the metal halide CsCdCl3:Mn2+ crystals with tunable afterglow properties good stability were grown by a facile solution method. Upon ultraviolet excitation, exhibited bright orange emission at 590 nm from d–d transition Mn2+ ions. doping concentrations matter LPL performance. By optimizing amount Mn2+, an enhanced duration up to 12 000 s was achieved, compared undoped sample, originating trap redistribution. The deep traps in CsCdCl3:0.1Mn2+ crystal that provide little contribution room temperature shifted shallow levels, thus synergistically enhancing intensity duration. Based on variable durations tuning concentrations, multi-dimensional information storage encryption model designed. This work gives understanding effect provides examples development encryption.

Язык: Английский

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Heterovalent Doping in CsCdCl₃ Enabled Tunable Multimode Luminescence and Photochromism Toward Multilevel Anti‐Counterfeiting

Advanced Optical Materials, Год журнала: 2023, Номер 12(11)

Опубликована: Дек. 10, 2023

Abstract Integrating self‐trapped excitons (STEs), dopants, and defect levels in a single‐component metal halide perovskite will be of significance for tunable multimode luminescence photochromism. Here, platform utilizing interactions STEs, defects, alien dopants CsCdCl 3 by heterovalent doping strategy is demonstrated, which the photoluminescence quantum efficiency improved, more importantly, emissions can manipulated statically dynamically changing excitation wavelength/irradiation time. Meanwhile, presence carrier trapping de‐trapping processes leads to bright orange–near‐infrared persistent photochromic behaviors, quickly erased white light, enabling visual displays codable dark dual‐fields. Inspired these versatile optical characteristics doped luminescent halides, multilevel encryption anti‐counterfeiting with advantages nondestructive convenient authentication constructed.

Язык: Английский

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Simultaneous achieving negative photoconductivity response and volatile resistive switching in Cs2CoCl4 single crystals towards artificial optoelectronic synapse

Light Science & Applications, Год журнала: 2024, Номер 13(1)

Опубликована: Дек. 2, 2024

Abstract The development of negative photoconductivity (NPC)-related devices is great significance for numerous applications, such as optoelectronic detection, neuromorphic computing, and synapses. Here, an unusual but interesting NPC phenomenon in the novel cesium cobalt chlorine (Cs 2 CoCl 4 ) single crystal-based reported, which simultaneously possess volatile resistive switching (RS) memory behavior. Joint experiment−theory characterizations reveal that behavior derived from intrinsic vacancy defects Cs , could trap photogenerated charge carriers produce internal electric field opposite to applied field. Such effect enables abnormal photodetection performance with a decrease electrical conductivity illumination. Also, large specific detectivity 2.7 × 10 12 Jones broadband detection wavelength 265 780 nm were achieved. In addition response, resulting demonstrate RS record-low 5 V m −1 . By integrating characteristics electric-pulse enhancement light-pulse depression NPC, artificial synapse was successfully demonstrated, based on simulation neural network algorithm, recognition application handwritten digital images realized. These pioneer findings are anticipated contribute significantly practical advancement metal halides fields in-memory technologies intelligence.

Язык: Английский

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Efficient UV Emission with Anti‐Thermal Quenching from Ce³⁺‐Activated 0D All‐Inorganic Zinc Halides

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 18, 2025

Abstract Inorganic metal halide perovskites have emerged as a prominent research focus in the field of visible‐region optoelectronic devices. However, exploring ultraviolet (UV)‐emitting inorganic with both high efficiency and excellent thermal stability is still large challenge. Herein, robust anti‐thermal quenching UV‐emitting material, Ce 3+ doped 0D Cs 2 ZnBr 4 reported, exhibiting doublet emission peaks at 342 367 nm photoluminescence quantum yield up to 97.0%. Specifically, doping imparts abnormal from 303 373 K thermally enhanced 1.8 fold luminescence. Thermoluminescence spectra density functional theory calculations demonstrate that behavior originated effective compensation activated defect levels 5d‐band. Furthermore, A bright UV light‐emitting diode based on :Ce fabricated, achieving an external 0.81% displaying exceptional long half‐lifetime 528 h. Thus, this work not only provides design strategy for phosphors but also paves new way cost‐effective, high‐power diodes.

Язык: Английский

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