scholarly journals Bright Blue, Green, and Red Luminescence from Dye-Sensitized Core@Shell Upconversion Nanophosphors under 800 nm Near-Infrared Light

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5338
Author(s):  
A-Ra Hong ◽  
Joon Soo Han ◽  
Gumin Kang ◽  
Hyungduk Ko ◽  
Ho Seong Jang
Keyword(s):  
Near Infrared ◽  
Functional Group ◽  
Infrared Light ◽  
Core Shell ◽  
Dye Sensitized ◽  
Nir Light ◽  
Light Excitation ◽  
Red Luminescence ◽  
Carboxyl Functional Group ◽  
Bright Blue

In this study, Li-based blue- and green-emitting core@shell (C@S) upconversion nanophosphors (UCNPs) and NaGdF4-based red-emitting C@S UCNPs were synthesized, and IR-808 dyes were conjugated with the C@S UCNPs to enhance upconversion (UC) luminescence. The surface of the as-synthesized C@S UCNPs, which was originally capped with oleic acid, was modified with BF4− to conjugate the IR-808 dye having a carboxyl functional group to the surface of the UCNPs. After the conjugation with IR-808 dyes, absorbance of the UCNPs was significantly increased. As a result, dye-sensitized blue (B)-, green (G)-, and red (R)-emitting UCNPs exhibited 87-fold, 10.8-fold, and 110-fold enhanced UC luminescence compared with B-, G-, and R-emitting Nd3+-doped C@S UCNPs under 800 nm near-infrared (NIR) light excitation, respectively. Consequently, dye-sensitized UCNPs exhibiting strong UC luminescence under 800 nm NIR light excitation have high applicability in a variety of biological applications.

Efficient Broadband Upconversion of Near-Infrared Light in Dye-Sensitized Core/Shell Nanocrystals

2016 ◽  
Vol 4 (11) ◽  
pp. 1760-1766 ◽  
Author(s):  
Guanying Chen ◽  
Wei Shao ◽  
Rashid R. Valiev ◽  
Tymish Y. Ohulchanskyy ◽  
Guang S. He ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Light ◽  
Core Shell ◽  
Near Infrared Light ◽  
Dye Sensitized

Constructing two-dimensional CuFeSe2@Au heterostructured nanosheets with an amorphous core and a crystalline shell for enhanced near-infrared light water oxidation

Nanoscale ◽  
2018 ◽  
Vol 10 (5) ◽  
pp. 2380-2387 ◽  
Author(s):  
Huang Wen ◽  
Hua Li ◽  
Suisui He ◽  
Fengjuan Chen ◽  
Erli Ding ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Oxidation ◽  
Near Infrared ◽  
Light Irradiation ◽  
Infrared Light ◽  
Core Shell ◽  
Two Dimensional ◽  
Near Infrared Light ◽  
Light Water ◽  
Nir Light

The reversed growth of 2D core–shell CuFeSe2@Au heterostructured nanosheets with a crystalline shell and an amorphous core were first prepared and show enhanced photocatalytic activity for water oxidation under NIR light irradiation.

Cu2−xSe@mSiO2–PEG core–shell nanoparticles: a low-toxic and efficient difunctional nanoplatform for chemo-photothermal therapy under near infrared light radiation with a safe power density

Nanoscale ◽  
2014 ◽  
Vol 6 (8) ◽  
pp. 4361-4370 ◽  
Author(s):  
Xijian Liu ◽  
Qian Wang ◽  
Chun Li ◽  
Rujia Zou ◽  
Bo Li ◽  
...  
Keyword(s):  
Power Density ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Infrared Light ◽  
Core Shell ◽  
Light Radiation ◽  
Shell Nanoparticles ◽  
Near Infrared Light ◽  
Nir Light ◽  
Core Shell Nanoparticles

A difunctional nanoplatform based on the Cu2−xSe@mSiO2–PEG core–shell nanoparticles demonstrates an excellent biocompatibility and can be used for combining photothermal- and chemotherapies driven by NIR light.

scholarly journals Fabrication And Characterization of Cs0.33WO3 Nanorod Combined Within Dye Sensitized Solar Cells For Near-Infrared Light Absorption

2021 ◽  
Author(s):  
Bo-Tau Liu ◽  
Tai-Yuan Hung ◽  
Nima E. Gorji
Keyword(s):  
Visible Light ◽  
Fermi Level ◽  
Near Infrared ◽  
Low Voltage ◽  
Dye Sensitized Solar Cells ◽  
Transport Layer ◽  
Infrared Light ◽  
Electron Transport Layer ◽  
Dye Sensitized ◽  
Nir Light

Abstract Near-infrared (NIR) light absorbing materials have been widely used in vehicle and building applications due to their transparent film structure with high absorption rate in NIR range and a high transmittance for the visible light. In this paper, Cesium-doped Tungstate (Cs0.33WO3) has been combined with dye-sensitized solar cell (DSSC) to convert the heat energy (absorbed from NIR light) into photocurrent. Cs0.33WO3 Nanorods were synthesized and used to prepare the active layer of the cell. The mesoporous Titanium dioxide (TiO2) on FTO has also been used as the electron transport layer (ETL). This simple structure of FTO/TiO2/Cs0.33WO3 resulted in a poor Fermi level alignment and a low voltage. However, a buffer layer made of Poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9- dioctylfluorene)] (PFN-DOF) improved the Fermi level alignment and the quality of the interface in the modified structure of FTO/TiO2/PFN-DOF/Cs0.33WO3 which improved the initial Jsc from 0.38 μA/cm2 to 0.45 μA/cm2 for the NIR range. In addition, the Jsc of this modified structure improved from 18.84 μA/cm2 to 27.56 μA/cm2 for the visible light. Finally, by using a P25-doped TiO2 layer, the Jsc increased from 0.70 μA/cm2 to 31.12 μA/cm2 for both NIR and visible light, respectively.

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 Photothermal Therapy Using Gold Nanorods and Near-Infrared Light in a Murine Melanoma Model Increases Survival and Decreases Tumor Volume

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Mary K. Popp ◽  
Imane Oubou ◽  
Colin Shepherd ◽  
Zachary Nager ◽  
Courtney Anderson ◽  
...  
Keyword(s):  
Light Source ◽  
Gold Nanorods ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Tumor Volume ◽  
Infrared Light ◽  
Led Light ◽  
Murine Melanoma ◽  
Nir Light ◽  
Melanoma Model

Photothermal therapy (PTT) treatments have shown strong potential in treating tumors through their ability to target destructive heat preferentially to tumor regions. In this paper we demonstrate that PTT in a murine melanoma model using gold nanorods (GNRs) and near-infrared (NIR) light decreases tumor volume and increases animal survival to an extent that is comparable to the current generation of melanoma drugs. GNRs, in particular, have shown a strong ability to reach ablative temperatures quickly in tumors when exposed to NIR light. The current research tests the efficacy of GNRs PTT in a difficult and fast growing murine melanoma model using a NIR light-emitting diode (LED) light source. LED light sources in the NIR spectrum could provide a safer and more practical approach to photothermal therapy than lasers. We also show that the LED light source can effectively and quickly heatin vitroandin vivomodels to ablative temperatures when combined with GNRs. We anticipate that this approach could have significant implications for human cancer therapy.

Detection of residual varicose veins with near infrared light in the early period after varicose surgery and near infrared light assisted sclerotherapy

Vascular ◽  
2021 ◽  
pp. 170853812110514
Author(s):  
Nail Kahraman ◽  
Gündüz Yümün ◽  
Deniz Demir ◽  
Kadir K Özsin ◽  
Sadık A Sünbül ◽  
...  
Keyword(s):  
Minimally Invasive ◽  
Saphenous Vein ◽  
Venous Insufficiency ◽  
Near Infrared ◽  
Varicose Veins ◽  
Infrared Light ◽  
Foam Sclerotherapy ◽  
Near Infrared Light ◽  
Nir Light ◽  
Male Patients

Objectives Varicose veins that cannot be seen with the naked eye can be easily detected with Near Infrared (NIR) light. With a minimally invasive procedure performed with NIR light guided, the need for reoperation is reduced, while optimal treatment of venous insufficiency and symptoms is provided. In this study, the detection of residual varicose veins after varicose vein surgery using NIR light and the results of treatment of sclerotherapy were investigated. Methods In this retrospective study, treatment and clinical outcomes of patients’ who underwent NIR light-guided foam sclerotherapy for Clinical-Etiology-Anatomy-Pathophysiology (CEAP) (C1, C2) stage residual varicose veins after surgical varicose treatment between 2014 and 2017 were examined. Data of patients who underwent foam sclerotherapy with NIR light were collected and analyzed. Results A total of 151 patients and 171 lower extremity varicose veins were treated with surgery. 55 (35.7%) of the patients were male, and 96 (62.3%) were female. Their age ranges from 20 to 64, with an average age of 45.38. 4 (2.6%) of the patients had phlebectomy. 137 of patients (90.7%) had ligation of perforated veins, phlebectomy, and great saphenous vein (GSV) stripping, 10 of patients (6.6%) had GSV stripping, perforating vein ligation, phlebectomy, and small saphenous vein (SSV) surgery. No residual leakage was observed in the controls of GSV, SSV, and perforating veins by duplex ultrasonography (DUS). In the first month after varicose surgery, an average of 1.64 ± 1.05 sessions of sclerotherapy was applied to patients with CEAP C1, C2 stage residual varicose veins. 70 patients had one session of sclerotherapy, 37 patients had two sessions of sclerotherapy, 20 patients had three sessions of sclerotherapy, and 11 patients had four sessions of sclerotherapy administrated. The need for complementary therapy was required for all female patients; 13 of the male patients did not require complementary sclerotherapy. While single-session sclerotherapy was applied to most male patients (32 (58.18%), 10 (18.18%) patients received two sclerotherapy sessions. After completing sclerotherapy, 7 (4.63%) patients had superficial venous thrombosis, and 13 (8.60%) patients had hyperpigmentation. Conclusion Surgical treatment is a safe and effective technique in venous insufficiency. Nevertheless, residual varicose veins may remain, and these can be detected noninvasively with NIR light. Foam sclerotherapy with NIR light is a minimally invasive and safe treatment method for small residual varicose veins after the operation. We think that sclerotherapy with NIR light as a complementary treatment is a practical, reliable, and demanding treatment for clinical improvement, especially in female patients.

Upconverting Near-Infrared Light through Energy Management in Core-Shell-Shell Nanoparticles

2013 ◽  
Vol 52 (50) ◽  
pp. 13419-13423 ◽  
Author(s):  
Hongli Wen ◽  
Hai Zhu ◽  
Xian Chen ◽  
Tak Fu Hung ◽  
Beilei Wang ◽  
...  
Keyword(s):  
Energy Management ◽  
Near Infrared ◽  
Infrared Light ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Near Infrared Light

Near-infrared light-triggered drug release from UV-responsive diblock copolymer-coated upconversion nanoparticles with high monodispersity

2018 ◽  
Vol 6 (21) ◽  
pp. 3531-3540 ◽  
Author(s):  
Jun Xiang ◽  
Xia Tong ◽  
Feng Shi ◽  
Qiang Yan ◽  
Bing Yu ◽  
...  
Keyword(s):  
Drug Release ◽  
Diblock Copolymer ◽  
Near Infrared ◽  
Controlled Drug Release ◽  
Infrared Light ◽  
Upconversion Nanoparticles ◽  
Near Infrared Light ◽  
Nir Light ◽  
Triggered Drug Release

The preparation of a new near-infrared (NIR) light-responsive nanocarrier for controlled drug release is demonstrated.

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