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

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(52)

Published: March 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

Language: 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, Journal Year: 2022, Volume and Issue: 61(33)

Published: June 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.

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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Broadband Emission Origin in Metal Halide Perovskites: Are Self‐Trapped Excitons or Ions?

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(51)

Published: March 29, 2023

Abstract It has always been a goal to realize high efficiency and broadband emission in single‐component materials. The appearance of metal halide perovskites makes it possible. Their soft lattice characteristics significant electron–phonon coupling synergistically generate self‐trapped excitons (STEs), contributing with large Stokes shift. Meanwhile, their structural/compositional diversity provides suitable active sites coordination environments for doping ns 2 ions, allowing 3 P n ( =0,1,2) → 1 S 0 transitions toward emission. ions is phenomenologically similar that STE emission, hindering in‐depth understanding origin, leading failure meet the design requirements practical applications. In this scenario, herein, fundamentals development such two mechanisms are summarized establish clear comprehensive phenomenon, which may pave way an ideal customization broadband‐emission perovskites.

Language: Английский

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Moisture-Induced reversible structure conversion of Zero-Dimensional organic cuprous bromide hybrids for multiple photoluminescent anti-Counterfeiting, information encryption and rewritable luminescent paper

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 458, P. 141436 - 141436

Published: Jan. 13, 2023

Language: Английский

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2D Perovskite Mn²⁺‐Doped Cs₂CdBr₂Cl₂ Scintillator for Low‐Dose High‐Resolution X‐ray Imaging

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(26)

Published: March 27, 2023

High-performance X-ray scintillators with low detection limits and high light yield are of great importance a challenge for low-dose imaging in medical diagnosis industrial detection. In this work, the synthesis new 2D perovskite, Cs2 CdBr2 Cl2 , via hydrothermal reaction is reported. By doping Mn2+ into yellow emission located at 593 nm obtained, photoluminescence quantum (PLQY) :5%Mn2+ perovskite reaches highest value 98.52%. The near-unity PLQY negligible self-absorption enable excellent scintillation performance 64 950 photons MeV-1 limit 17.82 nGyair s-1 . Moreover, combining poly(dimethylsiloxane) to fabricate flexible scintillator screen achieves resolution 12.3 line pairs (lp) mm-1 results suggest that promising candidate high-resolution imaging. study presents approach designing high-performance through metal-ion doping.

Language: Английский

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Broad Dual Emission by Codoping Cr³⁺(d→d) and Bi³⁺(s→p) in Cs₂Ag_0.6Na_0.4InCl₆Double Perovskite

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(33)

Published: June 28, 2023

A phosphor emitting both white light and broad near-infrared (NIR) radiation can simultaneously provide visual inspection early signs of rotting food products. The NIR emission is absorbed by the vibrational overtones water molecules present in items, providing non-invasive image contrast to assess freshness. Here we design a phosphor, namely, Cr3+ -Bi3+ -codoped Cs2 Ag0.6 Na0.4 InCl6 , that emit warm (1000 nm) with quantum yield 27 %. This dual emitter designed combining features s2 -electron (Bi3+ ) d3 (Cr3+ doping weak crystal field halide perovskite host. 6s2→6s16p1${6{s}^{2}\to 6{s}^{1}6{p}^{1}}$ excitation Bi3+ using commercial 370 nm ultraviolet light-emitting-diodes (UV-LED), yields emissions. fraction excited dopants light, other transfers its energy non-radiatively . Then de-excites emission. Temperature dependent (6.4-300 K) photoluminescence combination Tanabe-Sugano diagram show experiences ( Dq/B${{D}_{q}/B}$ =2.2), yielding 4T2→4A2${{{\rm \ }}^{4}{{\rm T}}_{2}\to {{\rm A}}_{2}}$ As proof concept, fabricated panel containing 122 phosphor-converted LEDs, demonstrating capability inspect

Language: Английский

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Enabling Enhanced Photocatalytic Hydrogen Evolution in Water by Doping Cs₂SnBr₆ Perovskite with Pt

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(2), P. 653 - 661

Published: Jan. 30, 2024

Lead (Pb) halide perovskites (LHPs) have attracted great interest in photocatalysis. However, the unsatisfactory stability and toxicity of Pb restrict its large-scale application. Herein, lead-free Cs2Pt0.25Sn0.75Br6 are reported for photocatalytic hydrogen reaction (HER) water. The partial substitution Sn atoms with Pt dramatically enhances HER performance Cs2SnBr6 perovskites. This doping approach allows to work aqueous phase without saturated hydrohalic acid. resultant dye-sensitized exhibit a remarkable H2 evolution rate 11.49 mmol g–1 h–1 an apparent quantum yield 7.2%. Various investigations uncover that significantly tunes intrinsic properties surface active sites Cs2Pt0.25Sn0.75Br6. Furthermore, more negative formation energy decreased hydrophilicity endow Cs2PtxSn1–xBr6 high against represents significant stride toward realization water-stable

Language: Английский

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Unraveling the triplet excited-state dynamics of Bi3+ in vacancy-ordered double perovskite Cs2SnCl6 nanocrystals

Nano Research, Journal Year: 2022, Volume and Issue: 15(7), P. 6422 - 6429

Published: April 25, 2022

Language: Английский

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Band Alignment Engineering in ns² Electrons Doped Metal Halide Perovskites

Laser & Photonics Review, Journal Year: 2022, Volume and Issue: 17(1)

Published: Oct. 26, 2022

Abstract Luminescent metal halide perovskites (MHPs) open new avenues for highly efficient radiation detection. To challenge the state‐of‐art technology, fundamental understanding of factors controlling light yield MHP scintillators is urgent. Herein, a design method established by simultaneously considering charge‐transfer and recombination efficiencies via band alignment engineering in doped MHPs materials, this strategy corroborated experimentally computationally applying it to luminescence n s 2 electron (Sb 3+ , Bi Te 4+ ) vacancy‐ordered double perovskite Cs ZrCl 6 . Alloying into optimized significantly improves scintillation performance, including twofold increase threefold detection limit over pristine high‐resolution X‐ray imaging with 20 μm 2D 0.2 mm 3D imaging. It believed that doping enabling holds great potential development next‐generation scintillators.

Language: Английский

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