Organic thermally activated delayed fluorescence (TADF) compounds used in photocatalysis

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(13), P. 7587 - 7680

Published: Jan. 1, 2021

Organic compounds that show Thermally Activated Delayed Fluorescence (TADF) have become wildly popular as next generation emitters in organic light-emitting diodes (OLEDs), but since 2016, received significant and increasing attention photocatalysts.

Language: Английский

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Luminescent First-Row Transition Metal Complexes

JACS Au, Journal Year: 2021, Volume and Issue: 1(11), P. 1860 - 1876

Published: Sept. 24, 2021

Precious and rare elements have traditionally dominated inorganic photophysics photochemistry, but now we are witnessing a paradigm shift toward cheaper more abundant metals. Even though emissive complexes based on selected first-row transition metals long been known, recent conceptual breakthroughs revealed that much broader range of in different oxidation states useable for this purpose. Coordination compounds V, Cr, Mn, Fe, Co, Ni, Cu show electronically excited with unexpected reactivity photoluminescence behavior. Aside from providing compact survey the key advances dynamic field, our Perspective identifies main design strategies enabled discovery fundamentally new types 3d-metal-based luminophores photosensitizers operating solution at room temperature.

Language: Английский

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Boosting Wide‐Range Tunable Long‐Afterglow in 1D Metal–Organic Halide Micro/Nanocrystals for Space/Time‐Resolved Information Photonics

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(16)

Published: March 9, 2021

Abstract Molecular afterglow materials with ultralong‐lived excited states have attracted considerable interest owing to their promise for light‐emitting devices, optical imaging, and anti‐counterfeiting applications. However, the realization of ultralong emission in low‐dimensional micro/nanostructures has remained an open challenge, limiting progress toward new‐generation photonic In this work, new types mono/binuclear metal–organic halide micro/nanocrystals tunable properties, made possibly by rational control over both room‐temperature phosphorescence thermally activated delayed fluorescence, are developed. Interestingly, coordination complexes present excitation‐dependent luminescence across a wide range (wavelength > 150 nm) broad color differences from blue yellow multiple long‐lived states. The 1D binuclear microrods further exhibit waveguide space/time dual‐resolved endowing them great potential wavelength‐division multiplexing information photonics logic gates. Therefore, work not only communicates first example wide‐range under ambient conditions but also provides route achieve communications compilation at micro/nanoscale.

Language: Английский

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

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 52(22), P. 8005 - 8058

Published: Jan. 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.

Language: Английский

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Efficient Thermally Activated Delayed Fluorescence from All‐Inorganic Cesium Zirconium Halide Perovskite Nanocrystals

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 59(49), P. 21925 - 21929

Published: Aug. 22, 2020

Thermally activated delayed fluorescence (TADF) is generally observed in solid-state organic molecules or metal-organic complexes. However, TADF all-inorganic colloidal nanocrystals (NCs) rare. Herein, we report the first synthesis of an air-stable lead-free Cs2 ZrCl6 perovskite NCs. The NCs exhibit long-lived triplet excited state (138.2 μs), and feature high photoluminescence (PL) quantum efficiency (QY=60.37 %) due to mechanism. emission color can be easily tuned from blue green by synthesizing mixed-halide ZrBrx Cl6-x (0≤x≤1.5) Femtosecond transient absorption temperature dependent PL measurements are performed clarify In addition, Bi3+ ions successfully doped into NCs, which further extends properties. This work not only develops a new halide for potential optoelectronic applications, but also offers unique strategies developing inorganic phosphors.

Language: Английский

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Luminescent and Photofunctional Transition Metal Complexes: From Molecular Design to Diagnostic and Therapeutic Applications

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(32), P. 14420 - 14440

Published: Aug. 4, 2022

There has been emerging interest in the exploitation of photophysical and photochemical properties transition metal complexes for diagnostic therapeutic applications. In this Perspective, we highlight major recent advances development luminescent photofunctional complexes, particular, those rhenium(I), ruthenium(II), osmium(II), iridium(III), platinum(II), as bioimaging reagents phototherapeutic agents, with a focus on molecular design strategies that harness modulate interesting behavior complexes. We also discuss current challenges future outlook both fundamental research clinical

Language: Английский

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Thermally Activated Delayed Fluorescence Zirconium‐Based Perovskites for Large‐Area and Ultraflexible X‐ray Scintillator Screens

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(43)

Published: Sept. 1, 2022

Flexible scintillator screens with environmental stability, high sensitivity, and low cost have emerged as candidates for X-ray imaging applications. Here, a large-scale cost-efficient solution synthesis of the vacancy-ordered double perovskite Cs2 ZrCl6 , which is characterized by thermal activation delayed fluorescence (TADF) dominated triplet emission under irradiation, demonstrated. The large Stokes shift efficient luminescence collection TADF effectively ensure light outcoupling efficiency. Further, flexible an area 400 cm2 are prepared using poly(dimethylsiloxane) (PDMS) carrier, exhibiting excellent scintillation properties yields 49 photons MeV-1 spatial resolutions up to 18 lp mm-1 detection limits 65 nGy s-1 . Finally, high-quality results non-planar dynamic objects such It believed that explored @PDMS would offer big step toward expanding application range scintillators in different environments.

Language: Английский

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Manganese(i) complexes with metal-to-ligand charge transfer luminescence and photoreactivity

Nature Chemistry, Journal Year: 2021, Volume and Issue: 13(10), P. 956 - 962

Published: Aug. 2, 2021

Language: Английский

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Ultrafast Dynamics of Self-Trapped Excitons in Lead-Free Perovskite Nanocrystals

The Journal of Physical Chemistry Letters, Journal Year: 2021, Volume and Issue: 12(34), P. 8256 - 8262

Published: Aug. 23, 2021

Lead-free halide perovskite nanocrystals (NCs) have received increasing attention owing to their low toxicity and high stability. Localized charge distribution strong carrier–phonon coupling in lead-free NCs facilitates the formation of self-trapped excitons (STEs), which typically give a broadband photoluminescence (PL) emission with large Stokes shift. In this Perspective, we highlight how PL modulations can rise an efficient white-light by understanding tuning ultrafast dynamics STEs NCs. We then present exciton energy transfer mediated provide thermally activated delayed fluorescence dopant PL. also illustrate promising directions for future applications based on STEs. hope that Perspective new viewpoint researchers understand promote optoelectronic applications.

Language: Английский

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Photoactive Metal-to-Ligand Charge Transfer Excited States in 3d⁶ Complexes with Cr⁰, Mn^I, Fe^II, and Co^III

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(9), P. 4903 - 4920

Published: Feb. 21, 2023

Many coordination complexes and organometallic compounds with the 4d6 5d6 valence electron configurations have outstanding photophysical photochemical properties, which stem from metal-to-ligand charge transfer (MLCT) excited states. This substance class makes extensive use of most precious least abundant metal elements, consequently there has been a long-standing interest in first-row transition photoactive MLCT Semiprecious copper(I) its completely filled 3d subshell is relatively straightforward well explored case, but 3d6 partially d-orbitals lead to energetically low-lying metal-centered (MC) states that can cause undesirably fast state deactivation. Herein, we discuss recent advances made isoelectronic Cr0, MnI, FeII, CoIII compounds, for long-lived become accessible over past five years. Furthermore, possible future developments search new subshells next-generation applications photophysics photochemistry.

Language: Английский

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