Recent progress of zero-dimensional luminescent metal halides

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(4), P. 2626 - 2662

Published: Jan. 1, 2021

This review provides in-depth insight into the structure–luminescence–application relationship of 0D all-inorganic/organic–inorganic hybrid metal halide luminescent materials.

Language: Английский

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Efficient Lone-Pair-Driven Luminescence: Structure–Property Relationships in Emissive 5s² Metal Halides

ACS Materials Letters, Journal Year: 2020, Volume and Issue: 2(9), P. 1218 - 1232

Published: Aug. 4, 2020

Low-dimensional metal halides have been the focus of intense investigations in recent years following success hybrid lead halide perovskites as optoelectronic materials. In particular, light emission low-dimensional based on 5s2 cations Sn2+ and Sb3+ has found utility a variety applications complementary to those three-dimensional because its unusual properties such broadband character highly temperature-dependent lifetime. These derive from exceptional chemistry lone pair, but terminology explanations given for vary widely, hampering efforts build cohesive understanding these materials that would development efficient devices. this Perspective, we provide structural overview with dynamics driven by stereoactivity pair identify features enable strong emission. We unite different theoretical models able explain bright centers into framework, which is then applied array compounds recently developed our group other researchers, demonstrating generating holistic picture field point view chemist. highlight state-of-the-art demonstrate unique capabilities versatile emissive promising future directions halides.

Language: Английский

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Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(40)

Published: July 10, 2021

Abstract Luminescent metal halide materials with flexible crystallography/electronic structures and tunable emission have demonstrated broad application prospects in the visible light region. However, designing near‐infrared (NIR) light‐emitting halides remains a challenge. Here, an enlightening prototype is proposed to explore high‐efficiency broadband NIR systems by incorporating Sb 3+ into Cs 2 ZnCl 4 matrix. Combined experimental analysis density functional theory calculations reveal modified self‐trapped excitons model elaborate emission. The high photoluminescence quantum yield of 69.9% peaking at 745 nm large full width half maximum 175 nm, along excellent air/thermal stability, show unique advantages lead‐free :Sb as source. substitution Cl − Br further enables red‐shift peak from 823 nm. diode device based on demonstrates potential non‐visible source night vision. This study puts forward effective strategy design novel eco‐friendly emissive provides guidance for expanding scope luminescent halides.

Language: Английский

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Sb³⁺ Dopant and Halogen Substitution Triggered Highly Efficient and Tunable Emission in Lead-Free Metal Halide Single Crystals

Chemistry of Materials, Journal Year: 2020, Volume and Issue: 32(12), P. 5327 - 5334

Published: May 15, 2020

Rational doping and compositional control remain significant challenges in designing luminescent metal halides to achieve highly efficient tunable emission. Here, the air-stable lead-free Cs2InCl5·H2O crystal with a zero-dimensional structure was investigated as pristine compound design new luminescence materials. Sb3+-doping Cs2InCl5·H2O:Sb3+ enabled broadband yellow emission photoluminescence quantum yield up 95.5%. The colors can be expanded into orange-red region by halogen substitution for Cs2InX5·H2O:Sb3+ (X = Cl/Br/I). optical characterizations along theoretical calculations demonstrate that characteristic singlet triplet self-trapped exciton emissions of ns2-metal-halide centers account luminescence. Moreover, admirable stability against air heat pave way its further applications white light-emitting diodes high-resolution fluorescent signs anticounterfeiting technology. Our achievement case Sb3+-doped represents successful strategy developing stable versatile applications.

Language: Английский

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Highly Efficient and Tunable Emission of Lead‐Free Manganese Halides toward White Light‐Emitting Diode and X‐Ray Scintillation Applications

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(14)

Published: Jan. 29, 2021

Abstract Environmental friendly metal halides have become emerging candidates as energy downconverting emitters for lighting and X‐ray imaging applications. Herein, luminescent single crystals of tetramethylammonium manganese chloride (C 4 H 12 NMnCl 3 ) tetraethylammonium bromide ((C 8 20 N) 2 MnBr are synthesized via a facile room‐temperature evaporation method. C with octahedrally tetrahedrally coordinated Mn 2+ correspondingly exhibited red green emission peaking at 635 515 nm both originating from T 1 – 6 A transition high photoluminescence quantum yield (PLQY) 91.8% 85.1% benefiting their specific crystal structures. Thanks to strong photoexcitation under blue light, PLQY, tunable spectra, good environmental stability, the white light‐emitting diode based on blending delivers an outstanding luminous efficacy 96 lm W −1 , approaching commercial level, shows no obvious intensity degradation after 3000 h operation. In addition, also demonstrate interesting characteristics excitation, exhibit steady‐state light yields 50 500 24 400 photons MeV low detectable limits 36.9 24.2 nGy air s radiation hardness, demonstration high‐resolution 5 lp mm . This work presents new avenue Mn‐based toward multifunctional

Language: Английский

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Mn²⁺‐Doped Metal Halide Perovskites: Structure, Photoluminescence, and Application

Laser & Photonics Review, Journal Year: 2020, Volume and Issue: 15(1)

Published: Nov. 30, 2020

Abstract Doping impurity ions into semiconductor luminescent materials offers a unique pathway for inducing new emission centers and enabling photoluminescence (PL) tuning. Among various luminescence materials, doping Mn 2+ metal halide perovskites becomes hot topic since demonstrate an energy transfer route from host to dopants, resulting in interesting photophysical properties. This review aims discuss the PL properties of nanocrystals or bulk crystals with different structural dimensions local environments (MnX 4 2– tetrahedron, MnX 6 octahedron, shortest Mn─Mn distance). In this regard, effects on their modifications are summarized. Variable ion exchange dynamics, increased intensity, enhanced stability induced by analyzed. These results also provide beneficial insights applications doped perovskites. Finally, present challenges ‐doped elaborated.

Language: Английский

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Perovskite Quantum Dots for Application in High Color Gamut Backlighting Display of Light-Emitting Diodes

ACS Energy Letters, Journal Year: 2020, Volume and Issue: 5(11), P. 3374 - 3396

Published: Oct. 12, 2020

Lead halide perovskite quantum dots (LHP QDs) exhibit great potential in the backlighting display of light-emitting diode applications. Light-emitting with high brightness, low cost, and wide color gamut can be achieved based on LHP QDs, which have advantages luminescence performance, tunable emission, facile synthesis. However, some drawbacks, including instability large-scale synthesis, that restrict practical application QDs remain. This Review focuses solutions to these obstacles. The gap between fundamental knowledge applications must narrowed. strategies for stability improvements scalable synthesis are summarized clarified. provides inspiration optimization promotes their backlighting, contributes current future solutions.

Language: Английский

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Photoluminescence of Singlet/Triplet Self‐Trapped Excitons in Sb³⁺‐Based Metal Halides

Advanced Optical Materials, Journal Year: 2021, Volume and Issue: 9(8)

Published: Feb. 18, 2021

Abstract Emerging lead‐free metal halides with low toxicity and unparalleled optoelectronic properties have attracted growing research interests, also demonstrating extensive application potentials. Among these, Sb 3+ ‐based all‐inorganic/organic–inorganic hybrid become a vital group due to the special energy level distribution along diverse optical properties. However, there remains gap in understanding relationship between crystal structure radiation process of involved emission. Herein, existing reports about luminescent are revisited their structure–luminescence–application is explored, it further established that triplet self‐trapped excitons (STEs) emission varies different crystallographic environments endows tunable performance. This work aims provide constructive strategies exploitation halides, guides structural design photoluminescence tuning doped halide materials.

Language: Английский

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Tin Halide Perovskites: From Fundamental Properties to Solar Cells

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(1)

Published: Oct. 9, 2021

Metal halide perovskites have unique optical and electrical properties, which make them an excellent class of materials for a broad spectrum optoelectronic applications. However, it is with photovoltaic devices that this has reached the apotheosis popularity. High power conversion efficiencies are achieved lead-based compounds, toxic to environment. Tin-based most promising alternative because their bandgap close optimal value applications, strong absorption, good charge carrier mobilities. Nevertheless, low defect tolerance, fast crystallization, oxidative instability tin currently limit efficiency. The aim review give detailed overview crystallographic, photophysical, properties tin-based perovskite compounds in multiple forms from 3D low-dimensional structures. At end, recent progress solar cells reviewed, mainly focusing on detail strategies adopted improve device performances. For each subtopic, current challenges outlook discussed, stimulate community address important issues concerted manner.

Language: Английский

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Unraveling the Near-Unity Narrow-Band Green Emission in Zero-Dimensional Mn²⁺-Based Metal Halides: A Case Study of (C₁₀H₁₆N)₂Zn_1–xMn_xBr₄ Solid Solutions

The Journal of Physical Chemistry Letters, Journal Year: 2020, Volume and Issue: 11(15), P. 5956 - 5962

Published: July 6, 2020

Zero-dimensional (0D) Mn2+-based metal halides are potential candidates as narrow-band green emitters, and thus it is critical to provide a structural understanding of the photophysical process. Herein, we propose that sufficiently long Mn-Mn distance in 0D enables all Mn2+ centers emit spontaneously, thereby leading near-unity photoluminescence quantum yield. Taking lead-free (C10H16N)2Zn1-xMnxBr4 (x = 0-1) solid solution an example, Zn/Mn alloying inhibits concentration quenching caused by energy transfer Mn2+. (C10H16N)2MnBr4 exhibits highly thermal stable luminescence even up 150 °C with emission at 518 nm full width half maximum 46 nm. The fabricated white light-emitting diode device shows high luminous efficacy 120 lm/W wide color gamut 104% National Television System Committee standard, suggesting its for liquid crystal displays backlighting. These results guidance designing new emitters halides.

Language: Английский

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