Near-infrared light-emitting electrochemical cells based on the excimer emission of a cationic iridium complex

2020 ◽  
Vol 8 (41) ◽  
pp. 14378-14385
Author(s):  
You-Xuan Liu ◽  
Rong-Huei Yi ◽  
Chien-Hsiang Lin ◽  
Zu-Po Yang ◽  
Chin-Wei Lu ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Near Infrared ◽  
Night Vision ◽  
Infrared Light ◽  
Iridium Complex ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Nir Light ◽  
Bio Imaging

Near-infrared (NIR) light-emitting devices with organic semiconductors have great potential for applications in bio-imaging, telecommunication, night-vision displays, and chemical sensing.

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.

Host-only solid-state near-infrared light-emitting electrochemical cells based on interferometric spectral tailoring

2016 ◽  
Vol 18 (6) ◽  
pp. 5034-5039 ◽  
Author(s):  
Jia-Hong Hsu ◽  
Hai-Ching Su
Keyword(s):  
Solid State ◽  
Near Infrared ◽  
Infrared Light ◽  
Electrochemical Cells ◽  
Near Infrared Light ◽  
Light Emitting

NIR EL can be achieved by adjusting the device thickness of non-doped saturated red LECs.

scholarly journals Molecularly engineered electroplex emission for an efficient near-infrared light-emitting electrochemical cell (NIR-LEC)

RSC Advances ◽  
2020 ◽  
Vol 10 (24) ◽  
pp. 14099-14106
Author(s):  
Hashem Shahroosvand ◽  
Leyla Heydari ◽  
Babak Nemati Bideh ◽  
Babak Pashaei
Keyword(s):  
Near Infrared ◽  
Electrochemical Cell ◽  
Infrared Light ◽  
Electrochemical Cells ◽  
Ruthenium Polypyridyl ◽  
Polypyridyl Complexes ◽  
Near Infrared Light ◽  
Light Emitting ◽  
Nir Emission ◽  
Ruthenium Polypyridyl Complexes

Electroplex emission is rarely seen in ruthenium polypyridyl complexes, and there have been no reports from light-emitting electrochemical cells (LECs) to date. Here, near-infrared (NIR) emission via the electroplex mechanism in a LEC was reported.

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.

Near-infrared light-emitting devices from individual heavily Ga-doped ZnO microwires

2017 ◽  
Vol 5 (10) ◽  
pp. 2542-2551 ◽  
Author(s):  
Gao-Hang He ◽  
Ming-Ming Jiang ◽  
Lin Dong ◽  
Zhen-Zhong Zhang ◽  
Bing-Hui Li ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emission ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Doped Zno

Electrically driven near-infrared light-emission from individual heavily Ga-doped ZnO microwires has been achieved, which can be analogous to incandescent sources.

Rare earth doped Si-rich ZnO for multiband near-infrared light emitting devices

2012 ◽  
Vol 101 (19) ◽  
pp. 191115 ◽  
Author(s):  
Emanuele Francesco Pecora ◽  
Thomas I. Murphy ◽  
Luca Dal Negro
Keyword(s):  
Rare Earth ◽  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Rare Earth Doped

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.

scholarly journals Suppression of Electric Field-Induced Segregation in Sky-Blue Perovskite Light-Emitting Electrochemical Cells

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1937
Author(s):  
Tatiana G. Liashenko ◽  
Anatoly P. Pushkarev ◽  
Arnas Naujokaitis ◽  
Vidas Pakštas ◽  
Marius Franckevičius ◽  
...  
Keyword(s):  
Electric Field ◽  
Band Gap ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Film Deposition ◽  
Infrared Light ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Turn On

Inexpensive perovskite light-emitting devices fabricated by a simple wet chemical approach have recently demonstrated very prospective characteristics such as narrowband emission, low turn-on bias, high brightness, and high external quantum efficiency of electroluminescence, and have presented a good alternative to well-established technology of epitaxially grown III-V semiconducting alloys. Engineering of highly efficient perovskite light-emitting devices emitting green, red, and near-infrared light has been demonstrated in numerous reports and has faced no major fundamental limitations. On the contrary, the devices emitting blue light, in particular, based on 3D mixed-halide perovskites, suffer from electric field-induced phase separation (segregation). This crystal lattice defect-mediated phenomenon results in an undesirable color change of electroluminescence. Here we report a novel approach towards the suppression of the segregation in single-layer perovskite light-emitting electrochemical cells. Co-crystallization of direct band gap CsPb(Cl,Br)3 and indirect band gap Cs4Pb(Cl,Br)6 phases in the presence of poly(ethylene oxide) during a thin film deposition affords passivation of surface defect states and an increase in the density of photoexcited charge carriers in CsPb(Cl,Br)3 grains. Furthermore, the hexahalide phase prevents the dissociation of the emissive grains in the strong electric field during the device operation. Entirely resistant to 5.7 × 106 V·m−1 electric field-driven segregation light-emitting electrochemical cell exhibits stable emission at wavelength 479 nm with maximum external quantum efficiency 0.7%, maximum brightness 47 cd·m−2, and turn-on bias of 2.5 V.

Molecularly Engineered Near‐Infrared Light‐Emitting Electrochemical Cells

2020 ◽  
Vol 30 (33) ◽  
pp. 1908103 ◽  
Author(s):  
Babak Pashaei ◽  
Soheila Karimi ◽  
Hashem Shahroosvand ◽  
Melanie Pilkington
Keyword(s):  
Near Infrared ◽  
Infrared Light ◽  
Electrochemical Cells ◽  
Near Infrared Light ◽  
Light Emitting
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