scholarly journals Recent Advances of Near-Infrared (NIR) Emissive Metal Complexes Bridged by Ligands with N- and/or O-Donor Sites

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 155
Author(s):  
Jian-Xun Liu ◽  
Shi-Lin Mei ◽  
Xian-He Chen ◽  
Chang-Jiang Yao
Keyword(s):  
Metal Complexes ◽  
Near Infrared ◽  
Development Trend ◽  
Structure Design ◽  
Design Strategies ◽  
Bridging Ligands ◽  
Light Emitting ◽  
Nir Light ◽  
Potential Applications ◽  
Emission Behavior

Near-infrared (NIR) emissive metal complexes have shown potential applications in optical communication, chemosensors, bioimaging, and laser and organic light-emitting diodes (OLEDs) due to their structural tunability and luminescence stability. Among them, complexes with bridging ligands that exhibit unique emission behavior have attracted extensive interests in recent years. The target performance can be easily achieved by NIR light-emitting metal complexes with bridging ligands through molecular structure design. In this review, the luminescence mechanism and design strategies of NIR luminescent metal complexes with bridging ligands are described firstly, and then summarize the recent advance of NIR luminescent metal complexes with bridging ligands in the fields of electroluminescence and biosensing/bioimaging. Finally, the development trend of NIR luminescent metal complexes with bridging ligands are proposed, which shows an attractive prospect in the field of photophysical and photochemical materials.

Lanthanide Doped Complexes and Organometallic Clusters: Design Strategies and their Applications in Biology and Photonics

2019 ◽  
Vol 9 (3) ◽  
pp. 166-217 ◽  
Author(s):  
Gangadharan A. Kumar
Keyword(s):  
Nanostructured Materials ◽  
Rational Design ◽  
Near Infrared ◽  
Organic Ligand ◽  
Central Core ◽  
Design Strategies ◽  
Ceramic Core ◽  
Light Emitting ◽  
Potential Applications ◽  
Lanthanide Atoms

In this review, we discuss the rational design of a new class of lanthanide-doped organometallic nanostructured materials called `molecular minerals`. Molecular minerals are nanostructured materials with a ceramic core made from chalcogenide groups and other heavy metals. Part of the central core atoms is replaced by suitable lanthanide atoms to impart fluorescent spectral properties. The ceramic core is surrounded by various types of organic networks thus making the structure partly ceramic and organic. The central core has superior optical properties and the surrounding organic ligand makes it easy to dissolve several kinds of organic solvents and fluoropolymers to make several kinds of active and passive photonic devices. This chapter starts with elaborate design strategies of lanthanidebased near-infrared emitting materials followed by the experimental results of selected near-infrared emitting lanthanide clusters. Finally, their potential applications in telecommunication, light-emitting diodes and medical imaging are discussed.

Near Infrared Fluorescent and Phosphorescent Organic Light-Emitting Devices

2009 ◽  
Vol 1154 ◽  
Author(s):  
Yixing Yang ◽  
Richard Farley ◽  
Timothy Steckler ◽  
Jonathan Sommer ◽  
Sang Hyun Eom ◽  
...  
Keyword(s):  
Near Infrared ◽  
Emission Peak ◽  
Organometallic Complex ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Nir Light ◽  
Organic Light ◽  
Potential Applications ◽  
Donor Acceptor ◽  
Organic Light Emitting Devices

AbstractOrganic light-emitting devices (OLEDs) emitting near-infrared (NIR) light have many potential applications, yet the efficiency of these devices remains very low, typically ˜0.1% or less. Here we report efficiency NIR OLEDs based on two fluorescent donor-acceptor-donor oligomers and a phosphorescent Pt-containing organometallic complex. External quantum efficiencies in the range of 0.5–3.8% with emission peak ranging from 700 to 890 nm have been achieved.

Catalyst Halogenation Enables Rapid and Efficient Polymerizations with Visible to Near-Infrared Light

2020 ◽  
Author(s):  
Alex Stafford ◽  
Dowon Ahn ◽  
Emily Raulerson ◽  
Kun-You Chung ◽  
Kaihong Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Transient Absorption ◽  
Reaction Times ◽  
Infrared Light ◽  
Structure Property ◽  
Light Emitting ◽  
Structure Property Relationships ◽  
Nir Light ◽  
Light Intensities ◽  
Emission Quenching

Driving rapid polymerizations with visible to near-infrared (NIR) light will enable nascent technologies in the emerging fields of bio- and composite-printing. However, current photopolymerization strategies are limited by long reaction times, high light intensities, and/or large catalyst loadings. Improving efficiency remains elusive without a comprehensive, mechanistic evaluation of photocatalysis to better understand how composition relates to polymerization metrics. With this objective in mind, a series of methine- and aza-bridged boron dipyrromethene (BODIPY) derivatives were synthesized and systematically characterized to elucidate key structure-property relationships that facilitate efficient photopolymerization driven by visible to NIR light. For both BODIPY scaffolds, halogenation was shown as a general method to increase polymerization rate, quantitatively characterized using a custom real-time infrared spectroscopy setup. Furthermore, a combination of steady-state emission quenching experiments, electronic structure calculations, and ultrafast transient absorption revealed that efficient intersystem crossing to the lowest excited triplet state upon halogenation was a key mechanistic step to achieving rapid photopolymerization reactions. Unprecedented polymerization rates were achieved with extremely low light intensities (< 1 mW/cm<sup>2</sup>) and catalyst loadings (< 50 μM), exemplified by reaction completion within 60 seconds of irradiation using green, red, and NIR light-emitting diodes.

scholarly journals Recent Advances on Metal-Based Near-Infrared and Infrared Emitting OLEDs

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1412 ◽  
Author(s):  
Malika Ibrahim-Ouali ◽  
Frédéric Dumur
Keyword(s):  
Metal Complexes ◽  
Optical Communication ◽  
Near Infrared ◽  
Infrared Region ◽  
Infrared Emission ◽  
Organic Light Emitting Diodes ◽  
Triplet States ◽  
Light Emitting ◽  
The Past ◽  
Organic Light

During the past decades, the development of emissive materials for organic light-emitting diodes (OLEDs) in infrared region has focused the interest of numerous research groups as these devices can find interest in applications ranging from optical communication to defense. To date, metal complexes have been most widely studied to elaborate near-infrared (NIR) emitters due to their low energy emissive triplet states and their facile access. In this review, an overview of the different metal complexes used in OLEDs and enabling to get an infrared emission is provided.

scholarly journals Development of a New Laparoscopic Detection System for Gastric Cancer Using Near-Infrared Light-Emitting Clips with Glass Phosphor

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 81
Author(s):  
Shunko Inada ◽  
Hayao Nakanishi ◽  
Masahiro Oda ◽  
Kensaku Mori ◽  
Akihiro Ito ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Laparoscopic Surgery ◽  
Near Infrared ◽  
Detection System ◽  
Fluorescent Detection ◽  
Infrared Light ◽  
Excitation Light ◽  
Light Emitting ◽  
Nir Light ◽  
Glass Phosphor

Laparoscopic surgery is now a standard treatment for gastric cancer. Currently, the location of the gastric cancer is identified during laparoscopic surgery via the preoperative endoscopic injection of charcoal ink around the primary tumor; however, the wide spread of injected charcoal ink can make it difficult to accurately visualize the specific site of the tumor. To precisely identify the locations of gastric tumors, we developed a fluorescent detection system comprising clips with glass phosphor (Yb3+, Nd3+ doped to Bi2O3-B2O3-based glasses, size: 2 mm × 1 mm × 3 mm) fixed in the stomach and a laparoscopic fluorescent detection system for clip-derived near-infrared (NIR) light (976 nm). We conducted two ex vivo experiments to evaluate the performance of this fluorescent detection system in an extirpated pig stomach and a freshly resected human stomach and were able to successfully detect NIR fluorescence emitted from the clip in the stomach through the stomach wall by the irradiation of excitation light (λ: 808 nm). These results suggest that the proposed combined NIR light-emitting clip and laparoscopic fluorescent detection system could be very useful in clinical practice for accurately identifying the location of a primary gastric tumor during laparoscopic surgery.

scholarly journals Catalyst Halogenation Enables Rapid and Efficient Polymerizations with Visible to Near-Infrared Light

2020 ◽  
Author(s):  
Alex Stafford ◽  
Dowon Ahn ◽  
Emily Raulerson ◽  
Kun-You Chung ◽  
Kaihong Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Transient Absorption ◽  
Reaction Times ◽  
Infrared Light ◽  
Structure Property ◽  
Light Emitting ◽  
Structure Property Relationships ◽  
Nir Light ◽  
Light Intensities ◽  
Emission Quenching

Driving rapid polymerizations with visible to near-infrared (NIR) light will enable nascent technologies in the emerging fields of bio- and composite-printing. However, current photopolymerization strategies are limited by long reaction times, high light intensities, and/or large catalyst loadings. Improving efficiency remains elusive without a comprehensive, mechanistic evaluation of photocatalysis to better understand how composition relates to polymerization metrics. With this objective in mind, a series of methine- and aza-bridged boron dipyrromethene (BODIPY) derivatives were synthesized and systematically characterized to elucidate key structure-property relationships that facilitate efficient photopolymerization driven by visible to NIR light. For both BODIPY scaffolds, halogenation was shown as a general method to increase polymerization rate, quantitatively characterized using a custom real-time infrared spectroscopy setup. Furthermore, a combination of steady-state emission quenching experiments, electronic structure calculations, and ultrafast transient absorption revealed that efficient intersystem crossing to the lowest excited triplet state upon halogenation was a key mechanistic step to achieving rapid photopolymerization reactions. Unprecedented polymerization rates were achieved with extremely low light intensities (< 1 mW/cm<sup>2</sup>) and catalyst loadings (< 50 μM), exemplified by reaction completion within 60 seconds of irradiation using green, red, and NIR light-emitting diodes.

Design of Broadband Near-Infrared Y0.57La0.72Sc2.71 (BO3)4:Cr3+ Phosphors Based on One-Site Occupation and Its Application in NIR Light-Emitting Diodes

2021 ◽  
Author(s):  
Haiyan Wu ◽  
Lihong Jiang ◽  
Kai Li ◽  
Chengyu Li ◽  
Hongjie Zhang
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Agricultural Products ◽  
Light Emitting ◽  
Site Occupation ◽  
Nir Light ◽  
Non Destructive

Recently, near-infrared (NIR) phosphor converted light-emitting diodes (pc-LEDs) have attracted much attention due to its applications in non-destructive detection of the quality of agricultural products and the non-destructive monitoring of...

Narrow bandgap covalent–organic frameworks with strong optical response in the visible and infrared

2015 ◽  
Vol 3 (10) ◽  
pp. 2244-2254 ◽  
Author(s):  
Li-Ming Yang ◽  
Eric Ganz ◽  
Song Wang ◽  
Xiao-Jun Li ◽  
Thomas Frauenheim
Keyword(s):  
Density Functional ◽  
Near Infrared ◽  
Density Functional Theory Calculations ◽  
Optical Response ◽  
Covalent Organic Frameworks ◽  
Functional Theory ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Narrow Bandgap ◽  
Potential Applications

We propose a new series of covalent–organic frameworks. These materials have narrow band gaps, leading to strong near infrared optical response. Density functional theory calculations are used to explore their properties. These novel infrared active materials may have potential applications in organic light-emitting devices, chemical and biological sensing, hybrid solar cells, or electroluminescence.

In Vivo Near Infrared Techniques for Protein Drug Development

2008 ◽  
pp. 1365-1373
Author(s):  
Yueqing Gu ◽  
Zhiyu Qian ◽  
Huimin Qian ◽  
Chunsheng Fang ◽  
Yulin Song
Keyword(s):  
Health Care ◽  
Near Infrared ◽  
Drug Carrier ◽  
Rapid Development ◽  
Infrared Light ◽  
Nir Light ◽  
Potential Applications ◽  
Living Tissues ◽  
Almost All

Near infrared (NIR) light (700 ~ 900 nm) possesses the capability of penetrating living tissues several centimeters due to the low absorbance of tissue intrinsic chromophores such as oxy- and deoxy-hemoglobin (the main absorber of visible light), melanin, water, and lipid (the principal absorber of infrared light). Featured with the deeper tissue penetration as well as nonionizing and nonradioactive, NIR light attracts extensive attentions on the development of noninvasive techniques for in vivo real time monitoring/tracing of biological signals in living tissues. Hitherto, NIR techniques have permeated to almost all aspects of health care, such as diagnosing disease (Nahum, Skippen, Gagnon, Macnab, & Skarsgard, 2006), designing the targeted molecular or drug carrier (Hsu et al., 2006), monitoring the response to therapeutic treatment (Tachtsidis et al., 2007), evaluating the rehabilitation, and so on. With the rapid development of various NIR techniques and more cooperation with clinic studies, more potential applications in health care will be exploited in the near future.

Efficient polymer light-emitting diodes (PLEDs) based on chiral [Pt(C^N)(N^O)] complexes with near-infrared (NIR) luminescence and circularly polarized (CP) light

2019 ◽  
Vol 7 (44) ◽  
pp. 13743-13747 ◽  
Author(s):  
Guorui Fu ◽  
Yani He ◽  
Wentao Li ◽  
Baowen Wang ◽  
Xingqiang Lü ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Light Emitters ◽  
Light Emitting ◽  
Circularly Polarized ◽  
Nir Light ◽  
Polymer Light Emitting Diodes ◽  
Nir Luminescence

Chiral NIR-light emitters [Pt(iqbt)(S-Ln)] (1–4) were used as dopants to produce CP-NIR-PLEDs displaying λem of 732 nm, ηMaxEQE of 0.87–0.93%, and gEL of up to 10−3.

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