Local Constraints on Junctions to Strengthen Near-Infrared Phosphorescence of Organic Dyes

2021 ◽  
pp. 11919-11925
Author(s):  
Siyu Sun ◽  
Yucong Fan ◽  
Liangwei Ma ◽  
You Han ◽  
Xiang Ma
Keyword(s):  
Near Infrared ◽  
Organic Dyes ◽  
Local Constraints

The Rise of Near-Infrared Emitters: Organic Dyes, Porphyrinoids, and Transition Metal Complexes

2016 ◽  
Vol 374 (4) ◽  
Author(s):  
Andrea Barbieri ◽  
Elisa Bandini ◽  
Filippo Monti ◽  
Vakayil K. Praveen ◽  
Nicola Armaroli
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Near Infrared ◽  
Organic Dyes ◽  
Infrared Emitters

scholarly journals Sustainable, Rapid Synthesis of Bright-Luminescent CuInS2-ZnS Alloyed Nanocrystals: Multistage Nano-xenotoxicity Assessment and Intravital Fluorescence Bioimaging in Zebrafish-Embryos

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
S. Shashank Chetty ◽  
S. Praneetha ◽  
Sandeep Basu ◽  
Chetana Sachidanandan ◽  
A. Vadivel Murugan
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Organic Dyes ◽  
Low Cost ◽  
Fluorescence Emission ◽  
Zebrafish Embryos ◽  
Fluorescence Bioimaging ◽  
Rapid Labeling

Abstract Near-infrared (NIR) luminescent CuInS2-ZnS alloyed nanocrystals (CIZS-NCs) for highly fluorescence bioimaging have received considerable interest in recent years. Owing, they became a desirable alternative to heavy-metal based-NCs and organic dyes with unique optical properties and low-toxicity for bioimaging and optoelectronic applications. In the present study, bright and robust CIZS-NCs have been synthesized within 5 min, as-high-as 230 °C without requiring any inert-gas atmosphere via microwave-solvothermal (MW-ST) method. Subsequently, the in vitro and in vivo nano-xenotoxicity and cellular uptake of the MUA-functionalized CIZS-NCs were investigated in L929, Vero, MCF7 cell lines and zebrafish-embryos. We observed minimal toxicity and acute teratogenic consequences upto 62.5 μg/ml of the CIZS-NCs in zebrafish-embryos. We also observed spontaneous uptake of the MUA-functionalized CIZS-NCs by 3 dpf older zebrafish-embryos that are evident through bright red fluorescence-emission at a low concentration of 7.8 μg/mL. Hence, we propose that the rapid, low-cost, large-scale “sustainable” MW-ST synthesis of CIZS-NCs, is an ideal bio-nanoprobe with good temporal and spatial resolution for rapid labeling, long-term in vivo tracking and intravital-fluorescence-bioimaging (IVBI).

Recent progress in utilizing near-infrared J-aggregates for imaging and cancer therapy

2021 ◽  
Author(s):  
Shuai Xu ◽  
Hong-Wen Liu ◽  
Shuang-Yan Huan ◽  
Lin Yuan ◽  
Xiao-Bing Zhang
Keyword(s):  
Cancer Therapy ◽  
Recent Progress ◽  
Near Infrared ◽  
Organic Dyes ◽  
Therapeutic Agents ◽  
Schematic Diagram ◽  
J Aggregates

Schematic diagram of NIR J-aggregates of various organic dyes as effective bioimaging (fluorescence (FL) or photoacoustic (PA)) and therapeutic agents (PDT or PTT).

“A bridge over troubled gaps”: up-conversion driven photocatalysis for hydrogen generation and pollutant degradation by near-infrared excitation

2018 ◽  
Vol 54 (15) ◽  
pp. 1905-1908 ◽  
Author(s):  
P. Acosta-Mora ◽  
K. Domen ◽  
T. Hisatomi ◽  
H. Lyu ◽  
J. Méndez-Ramos ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Near Infrared ◽  
Hydrogen Generation ◽  
Organic Dyes ◽  
Pollutant Degradation ◽  
Present Evidence ◽  
Photon Conversion ◽  
Infrared Excitation

We present evidence of NIR-to-UV-VIS photon conversion for degradation of organic dyes and hydrogen and oxygen evolution.

scholarly journals A Palette of Efficient and Stable Far-Red and NIR Dye Lasers

2020 ◽  
Vol 10 (18) ◽  
pp. 6206
Author(s):  
Edurne Avellanal-Zaballa ◽  
Leire Gartzia-Rivero ◽  
Jorge Bañuelos ◽  
Inmaculada García-Moreno ◽  
Antonia R. Agarrabeitia ◽  
...  
Keyword(s):  
Spectral Region ◽  
Near Infrared ◽  
Laser Emission ◽  
Organic Dyes ◽  
Infrared Region ◽  
Dye Lasers ◽  
Spectral Window ◽  
Conformationally Restricted ◽  
The One ◽  
New Generation

The disposal of long-wavelength-emitting sources is of paramount relevance in technology and biophotonics due to the low interference with the surroundings that these kinds of far-red and near-infrared radiations hold. As a result of the continued efforts carried out during the last few years by our research group to design new boron-dipyrromethene (BODIPY) dyes with improved photonic performance, two approaches were tested to develop a new generation of organic dyes able to display efficient and long-lasting laser emission in both target spectral regions. On the one hand, the annulation of aromatic benzofuran at the dipyrrin backbone leads to conformationally restricted dyes yielding photostable and bright laser emission beyond 600 nm at the far-red spectral region. On the other hand, a more pronounced shift to longer wavelengths reaching 725 nm at the near-infrared region is feasible, while keeping a reasonably high laser efficiency and tolerance to prolonged and intense pumping, based on aza-BODIPYs bearing peripheral aryl rings. These two complementary strategies yield a library of laser-emitting compounds comprising the 600–725 nm spectral region. Moreover, their laser performance is better than the commercially available dye lasers active in this spectral window.

scholarly journals Bright AIE Nanoparticles for Two-Photon Imaging and Localized Compound Therapy of Cancers.pdf

2020 ◽  
Author(s):  
Ying Li ◽  
Rongbing Tang ◽  
Xiaoyan Liu ◽  
Junyi Gong ◽  
Zujin Zhao ◽  
...  
Keyword(s):  
Near Infrared ◽  
Organic Dyes ◽  
Cationic Lipid ◽  
Biological Tissues ◽  
Photon Absorption ◽  
Infrared Light ◽  
Two Photon ◽  
Theranostic Agent ◽  
New Strategy ◽  
Melanoma Model

Photodynamic therapy (PDT) is a non-invasive therapeutic strategy for cancer treatment but it always suffers from low reactive oxygen species (ROS) efficiency generated from traditional organic dyes owing to weak absorption in the optical transparent window of biological tissues and fluorescence quenching at a concentrated solution or in nanoparticles. Herein, we present cationic lipid-encapsulated aggregation-induced emission (AIE) nanoparticles (NPs) that have a high quantum yield (23%) and a maximum two-photon absorption (TPA) cross-section<b><i> </i></b>of 560 GM irradiated by near infrared light (800 nm). The AIE NPs can serve as imaging agents for spatiotemporal imaging of tumor tissues with a penetration depth up to 505 µm on mice melanoma model. Noteworthy, the AIE NPs can efficiently generate singlet oxygen (<sup>1</sup>O<sub>2</sub>) and highly toxic hydroxyl radicals (<b>·</b>OH) upon 800 nm-light irradiation for photodynamic tumor ablation. In addition, the AIE NPs can be effectively cleared from the mouse body after the imaging and therapy. This study provides a new strategy to develop theranostic agent for cancer image-guided PDT with high brightness, superior photostability and high biosafety

scholarly journals J-Aggregates of meso- [2.2] Paracyclophanyl-BODIPY Dye for NIR-II Imaging

2020 ◽  
Author(s):  
Zhipeng Liu ◽  
Kang Li ◽  
Xingchen Duan ◽  
Zhiyong Jiang ◽  
Dan Ding ◽  
...  
Keyword(s):  
Near Infrared ◽  
Organic Dyes ◽  
Fluorescent Imaging ◽  
Imaging Agents ◽  
Aggregation State ◽  
Guided Surgery ◽  
Lymph Node Imaging ◽  
Diluted Solution ◽  
J Aggregates

Abstract J-aggregation has been proved to be an efficient strategy for the development of fluorescent imaging agents in the second near-infrared (NIR-II, 1000–1700 nm) window. However, the design of NIR-II fluorescent J-aggregates is challenging due to the lack of suitable J-aggregation dyes. Herein, we report meso-[2.2]paracyclophanyl-3,5-bis-N,N-dimethylaminostyrl BODIPY (PCP-BDP2) as the first example of BODIPY dye with J-aggregation induced NIR-II fluorescence. PCP-BDP2 shows emission maximum at 795 nm in diluted solution and NIR-II emission at 1010 nm in the J-aggregation state. Mechanism studies reveal that the steric and conjugation effect of the PCP group on the BODIPY core plays key roles in the J-aggregation behavior and NIR-II fluorescence tuning. Notably, NIR-II emissive J-aggregates of PCP-BDP2 can be efficiently stabilized in the assembled nanoparticle. Taking advantage of high quantum yield and good photo-/chemo-stability, J-aggregates of PCP-BDP2 show high-resolution and long-term in vivo NIR-II imaging ability. Furthermore, J-aggregates of PCP-BDP2 can be utilized for lymph node imaging and fluorescence-guided surgery in the nude mouse, which demonstrates their potential clinical application. This study not only demonstrates BODIPY dye as a new J-aggregation platform for developing NIR-II imaging agents but also encourages further exploration on J-aggregation induced NIR-II emission of the other conventional organic dyes.

Highly efficient photocatalytic activity of Ag3VO4/WO2.72 nanocomposites for the degradation of organic dyes from the ultraviolet to near-infrared regions

2020 ◽  
Vol 512 ◽  
pp. 145618 ◽  
Author(s):  
Kebena Gebeyehu Motora ◽  
Chang-Mou Wu ◽  
Tolesa Fita Chala ◽  
Min-Hui Chou ◽  
Chung-Feng Jeffrey Kuo ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Near Infrared ◽  
Organic Dyes ◽  
Highly Efficient

Design of AIEgens for Near-Infrared IIb Imaging Through Structural Modulation at Molecular and Morphological Levels

2019 ◽  
Author(s):  
yuanyuan li ◽  
Zhaochong Cai ◽  
shunjie liu ◽  
Haoke Zhang ◽  
sherman Wong ◽  
...  
Keyword(s):  
Blood Vessels ◽  
Fluorescence Imaging ◽  
Near Infrared ◽  
Molecular Design ◽  
Organic Dyes ◽  
Tissue Imaging ◽  
Deep Penetration ◽  
Structural Modulation ◽  
Organic Fluorophore

<p>Fluorescence imaging in near-infrared IIb (NIR-IIb, 1500-1700 nm) spectrum holds a considerable promise for tissue imaging with deep penetration and high spatial resolution owing to the minimized autofluorescence and suppressed photon scattering. While few inorganic NIR-IIb fluorescent probes have been reported, their organic counterparts are still underdeveloped, possibly due to the lack of efficient materials with long emission wavelength. Herein, we propose a new molecular design philosophy to develop organic NIR-IIb fluorophores with high quantum yield (QY) by manipulation of the effects of twisted intramolecular charge transfer and aggregation-induced emission at the molecular and morphological levels. A pure organic fluorescent dye emitting up to 1600 nm with a QY of 14.2% in the NIR-II region (1000-1600 nm) is developed. For the first time, NIR-IIb fluorescence imaging of blood vessels and deeply-located intestinal tract of live mice based on organic dyes is achieved. The results show that organic fluorophore performs superb imaging ability in both superficial blood vessels and internal organs with high resolution and enhanced signal-to-background ratio in NIR-IIb region. We hope this groundbreakingly study will inspire further research on the evolution of pure organic NIR-IIb probes for in vivo imaging.</p>

scholarly journals Design and synthesis of aromatic molecules for probing electric fields at the nanoscale

2015 ◽  
Vol 184 ◽  
pp. 251-262 ◽  
Author(s):  
Sanli Faez ◽  
Nico R. Verhart ◽  
Marios Markoulides ◽  
Francesco Buda ◽  
André Gourdon ◽  
...  
Keyword(s):  
Electric Fields ◽  
Single Molecule ◽  
Binding Sites ◽  
Density Functional ◽  
Near Infrared ◽  
Organic Dyes ◽  
Single Molecule Spectroscopy ◽  
Functional Theory ◽  
Design And Synthesis ◽  
Aromatic Molecules

We propose using halogenated organic dyes as nanoprobes for electric fields and show their greatly enhanced Stark coefficients using density functional theory (DFT) calculations. We analyse halogenated variants of three molecules that have been of interest for cryogenic single molecule spectroscopy: perylene, terrylene, and dibenzoterrylene, with the zero-phonon optical transitions at blue, red, and near-infrared. Out of all the combinations of halides and binding sites that are calculated, we have found that fluorination of the optimum binding site induces a dipole difference between the ground and excited states larger than 0.5 D for all three molecules with the highest value of 0.69 D for fluoroperylene. We also report on the synthesis of 3-fluoroterrylene and the bulk spectroscopy of this compound in liquid and solid organic environments.

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