Light Emission of Self‐Trapped Excitons in Inorganic Metal Halides for Optoelectronic Applications

Advanced Materials, Год журнала: 2022, Номер 34(52)

Опубликована: Март 24, 2022

Abstract Self‐trapped excitons (STEs) have recently attracted tremendous interest due to their broadband emission, high photoluminescence quantum yield, and self‐absorption‐free properties, which enable a large range of optoelectronic applications such as lighting, displays, radiation detection, special sensors. Unlike free excitons, the formation STEs requires strong coupling between excited state soft lattice in low electronic dimensional materials. The chemical structural diversity metal halides provides an ideal platform for developing efficient STE emission Herein, overview recent progress on materials is presented. relationships fundamental mechanisms, compositions, device performances are systematically reviewed. On this basis, currently existing challenges possible development opportunities field

Язык: Английский

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Zero‐Dimensional Zn‐Based Halides with Ultra‐Long Room‐Temperature Phosphorescence for Time‐Resolved Anti‐Counterfeiting

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(33)

Опубликована: Июнь 15, 2022

Though fluorescence-tag-based anti-counterfeiting technology has distinguished itself with cost-effective features and huge information loading capacity, the clonable decryption process of spatial-resolved cannot meet requirements for high-security-level anti-counterfeiting. Herein, we demonstrate a spatial-time-dual-resolved system based on new organic-inorganic hybrid halides BAPPZn2 (Cly Br1-y )8 (BAPP=1,4-bis(3-ammoniopropyl)piperazinium, y=0-1) ultra-long room-temperature phosphorescence (RTP). Remarkably, afterglow lifetime can be facilely tuned by regulating halide-induced heavy-atom effect identified naked eyes or help simple machine vision system. Therefore, short-lived unicolor fluorescence lasting-time-tunable RTP provide prerequisites unicolor-time-resolved anti-counterfeiting, which lowers decryption-device further provides design strategy advanced portable technology.

Язык: 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, Год журнала: 2022, Номер 61(26)

Опубликована: Апрель 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.

Язык: Английский

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(C16H28N)2SbCl5: A new lead-free zero-dimensional metal-halide hybrid with bright orange emission

Science China Materials, Год журнала: 2022, Номер 65(6), С. 1594 - 1600

Опубликована: Янв. 29, 2022

Язык: Английский

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Regulating Exciton De‐Trapping of Te⁴⁺‐Doped Zero‐Dimensional Scandium‐Halide Perovskite for Fluorescence Thermometry with Record High Time‐Resolved Thermal Sensitivity

Advanced Materials, Год журнала: 2023, Номер 35(44)

Опубликована: Авг. 21, 2023

Abstract Fluorescence thermometry has been propelled to the forefront of scientific attention due its high spatial resolution and remote non‐invasive detection. However, recent generations thermometers still suffer from limited thermal sensitivity ( S r ) below 10% change per Kelvin. Herein, this work presents an ideal temperature‐responsive fluorescence material through Te 4+ ‐doped 0D Cs 2 ScCl 5 ·H O, in which isolated polyhedrons endow highly localized electronic structures, strong electron–phonon coupling facilitates formation self‐trapped excitons (STEs). With rising temperature, dramatic asymmetric expansion soft lattice induces increased defects, exciton–phonon coupling, low activation energy, evokes a rapid de‐trapping process STEs, enabling several orders magnitude changes lifetime over narrow temperature range. After regulating with different doping, record‐high (27.36% K −1 lifetime‐based detection is achieved at 325 K. The robust stability against multiple heating/cooling cycles long‐term measurements enables uncertainty 0.067 Further, developed are demonstrated for local monitoring operating on internal components. It believed that constitutes solid step towards building next generation ultrasensitive based low‐dimensional metal halides.

Язык: Английский

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Bright Cyan‐Emissive Copper(I)‐Halide Single Crystals for Multi‐Functional Applications

Advanced Optical Materials, Год журнала: 2022, Номер 10(16)

Опубликована: Май 29, 2022

Abstract Anti‐counterfeiting has become a serious issue around the global world; fluorescence‐based tags are praised for low‐cost and facile decryption process. However, high‐level anti‐counterfeiting application requires incorporating multifunctional luminescent materials with response to different excitation sources. Herein, dimeric Cu(I)‐halide‐clusters‐assembled single‐crystal (AEP) 2 Cu I 6 ·2I·2H O (AEP = N ‐aminoethylpiperazinium) concerning high down‐conversion photoluminescence quantum yield (PLQY) value of near unity is reported (λ ex 305 nm), which can also be activated by near‐infrared light X‐ray. The ultrafast spectroscopy density functional theory calculations reveal that broad‐band emission originates from recombination self‐trapped excitons. Remarkably, PLQY excellent attenuation capability X‐ray confers an outstanding 55 650 photons MeV −1 O, 5.25 times higher than standard bismuth germaniumoxide scintillator. Such multi‐light‐stimulus endows great potential in anti‐counterfeiting, solid‐state lighting devices, digital radiography.

Язык: Английский

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0D hybrid indium halide as a highly efficient X-ray scintillation and ultra-sensitive fluorescent probe

Materials Horizons, Год журнала: 2023, Номер 10(11), С. 5004 - 5015

Опубликована: Янв. 1, 2023

A family of new 0D hybrid indium halides as highly efficient yellow light emitters showcase multiple advanced applications in white emitting diode, selective fluorescence sensing for nitrobenzene and X-ray scintillation performance.

Язык: Английский

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A 0D hybrid lead-free halide with near-unity photoluminescence quantum yield toward multifunctional optoelectronic applications

Chemical Science, Год журнала: 2023, Номер 15(3), С. 953 - 963

Опубликована: Дек. 6, 2023

0D hybrid indium halide exhibits near-unity PLQY and negligible self-absorption realizing multiple cutting-edge optoelectronic applications in high-performance white LED, X-ray scintillation reversible fluorescent probe toward tribromomethane.

Язык: Английский

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Anti‐Solvent Synthesis of Three‐Color Indium‐Based Halide Perovskite Microplate/Microcrystal Phosphors for High Color Rendering WLEDs

Advanced Optical Materials, Год журнала: 2023, Номер 11(16)

Опубликована: Май 7, 2023

Abstract Lead‐free halide perovskites are emerging as promising eco‐friendly candidates for next‐generation solid‐state lighting because of their nontoxicity and availability broad emission. Herein, a modified room‐temperature anti‐solvent precipitation method is developed to synthesize the Sb 3+ ‐doped, In‐based, lead‐free in microplate/microcrystal structure with different emission colors. The layered InCl 3 serves template growth Cs 2 5 (H O):Sb microplate phosphors. Moreover, presence HCl not only improves solubility precursors, but also provides acid etching effect. resultant ‐doped O) phosphors show bright yellow photoluminescence quantum yield up 92.4%. Furthermore, 6 :Sb NaInCl synthesized through similar method, which displays green deep‐blue emission, respectively. Subsequently, proof‐of‐concept white light‐emitting diodes (WLEDs) fabricated based on + phosphors, achieves high‐quality light color rendering index (CRI) 91.6 95.4, results greatly advance development perovskite synthesis, may offer new possibilities high CRI WLEDs fabrication.

Язык: Английский

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Photophysical Properties of Copper Halides with Strongly Confined Excitons and Their High‐Performance X‐Ray Imaging

Advanced Functional Materials, Год журнала: 2024, Номер 34(26)

Опубликована: Фев. 25, 2024

Abstract Copper halides, a new class of attractive and potential scintillators, have attracted tremendous attention in X‐ray imaging. However, the ambiguity surrounding their exciton properties unclear effect crystal structure on photophysical performance hinder an in‐depth understanding luminescence mechanism further application imaging field. Herein, copper halide scintillators Cs 3 Cu 2 X 5 (X = I, Br, Cl) with 0D is prepared, are revealed using both theoretical calculation experimental verification. The small Bohr diameter together high binding energy can cause to hold strongly confined excitons lack quantum‐size effects. materials exhibit structural framework soft lattice Frenkel strong confinement effects, resulting self‐trapped excitons. In particular, I demonstrated as efficient scintillator radioluminescence efficiency spatial resolution ≈106 µm radiography, which primarily attributed improve radiative recombination probability electron‐hole pairs. Overall, this work provides pathway for developing performance.

Язык: Английский

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