Cubic versus Hexagonal – Phase, Size and Morphology Effects on the Photoluminescence Quantum Yield of NaGdF4:Er3+/Yb3+ Upconverting Nanoparticles

Nanoscale ◽  
2022 ◽  
Author(s):  
Marta Quintanilla ◽  
Eva Hemmer ◽  
Jose Marques-Hueso ◽  
Shadi Rohani ◽  
Giacomo Lucchini ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Visible Light ◽  
Luminescence Intensity ◽  
Near Infrared ◽  
Hexagonal Phase ◽  
Infrared Light ◽  
Photoluminescence Quantum Yield ◽  
Phase Size ◽  
Uv Visible ◽  
Size And Morphology

Upconverting nanoparticles (UCNPs) are well-known for their capacity to convert near-infrared light into UV/visible light, benefitting various applications where light triggering is required. At the nanoscale, loss of luminescence intensity...

scholarly journals In Situ Ultraviolet Polymerization Using Upconversion Nanoparticles: Nanocomposite Structures Patterned by Near Infrared Light

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2054
Author(s):  
Hongsub Jee ◽  
Guanying Chen ◽  
Paras N. Prasad ◽  
Tymish Y. Ohulchanskyy ◽  
Jaehyeong Lee
Keyword(s):  
Polymer Nanocomposites ◽  
Near Infrared ◽  
Infrared Light ◽  
Upconversion Nanoparticles ◽  
Nanocomposite Structure ◽  
Shell Design ◽  
Uv Visible ◽  
Harsh Conditions ◽  
Nanocomposite Structures

In this paper, we report an approach to polymerization of a nanocomposite containing UV-polymerizable organic material and inorganic, NaYbF4:Tm3+ core-based nanoparticles (NPs), which are optimized for upconversion of near infrared (NIR) to ultraviolet (UV) and blue light. Our approach is compatible with numerous existing UV-polymerizable compositions and the NaYF4: Yb, Tm3+ core-based NPs are much more stable against harsh conditions than NIR organic photo-initiators proposed earlier. The use of a core-shell design for the NPs can provide a suitable method for binding with organic constituents of the nanocomposite, while maintaining efficient NIR-to-UV/blue conversion in the NaYbF4 core. The prepared photopolymerized transparent polymer nanocomposites display upconversion photoluminescence in UV, visible and NIR ranges. We also demonstrate a successful fabrication of polymerized nanocomposite structure with millimeter/submillimeter size uniformly patterned by 980 nm irradiation of inexpensive laser diode through a photomask.

Efficient conversion of broad UV–visible light to near-infrared emission in Mn4+/Yb3+ co-doped CaGdAlO4 phosphors

2019 ◽  
Vol 210 ◽  
pp. 189-201 ◽  
Author(s):  
Jianxu Hu ◽  
Yuanpeng Zhang ◽  
Bin Lu ◽  
Haiping Xia ◽  
Huanqing Ye ◽  
...  
Keyword(s):  
Visible Light ◽  
Near Infrared ◽  
Infrared Emission ◽  
Efficient Conversion ◽  
Uv Visible ◽  
Near Infrared Emission ◽  
Co Doped

Generation of a Tryptophan Radical in High Quantum Yield from a Novel Amino Acid Analog Using Near-UV/Visible Light

1997 ◽  
Vol 119 (28) ◽  
pp. 6457-6460 ◽  
Author(s):  
Doug Burdi ◽  
Béatrice M. Aveline ◽  
Paul D. Wood ◽  
JoAnne Stubbe ◽  
Robert W. Redmond
Keyword(s):  
Amino Acid ◽  
Quantum Yield ◽  
Visible Light ◽  
High Quantum Yield ◽  
High Quantum ◽  
Acid Analog ◽  
Amino Acid Analog ◽  
Uv Visible

Influence of Sputtering Power on the Structure, Optical and Electric Properties of Cu3N Films

2015 ◽  
Vol 814 ◽  
pp. 596-600 ◽  
Author(s):  
Li Na Chen ◽  
Jin Feng Leng ◽  
Zhong Xi Yang ◽  
Zhi Chao Meng ◽  
Bin Sun
Keyword(s):  
Near Infrared ◽  
Optical Band Gap ◽  
Infrared Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sputtering Power ◽  
Deposition Power ◽  
Higher Power ◽  
Uv Visible ◽  
Peak Value

The Cu3N films were deposited successfully by reactive direct current magnetron sputtering, the films were comprehensively and systematically characterized by X-ray diffraction analyzer (XRD), UV-Visible spectrophotometer, four-probe resistance tester and other instruments. Results showed that under low deposition power (80W~100W), crystal orientation increased, which is attributed to higher energy under higher power. When sputtering power exceeded the value, excessive energy led to anti-sputtering hindering the process of further nucleation and growth of films. The transmittance of the films deposited under 100W reached the peak value of 78% on the scope of near-infrared light, and optical band gap (Eg) of 1.35ev. The resistivity of Cu3N films increased from 9.68×102Ω.cm to 2.12×103Ω.cm with increasing in sputtering power up to 100W.

scholarly journals IMAGING DIAGNOSTICS OF COMBUSTION INSTABILITY IN PREMIXED SWIRLING COMBUSTION

2020 ◽  
Vol 4 ◽  
pp. 80-93
Author(s):  
Yao Yang ◽  
Gaofeng Wang ◽  
Yuanqi Fang ◽  
YIfan Xia ◽  
Liang Zhong
Keyword(s):  
Visible Light ◽  
Near Infrared ◽  
Combustion Instability ◽  
Infrared Light ◽  
Imaging Method ◽  
Near Infrared Light ◽  
Stable Combustion ◽  
Significant Difference ◽  
Unstable Combustion ◽  
Swirling Flames

An experimental study on combustion instability is presented with focus on propane-air premixed swirling flames. Swirling flames under self-excited oscillation are studied by imaging of visible light and OH* chemiluminescence filter under several typical conditions. The dynamical characteristics of swirling flames were analysed by Dynamic Mode Decomposition (DMD) method. Three types of unstable modes in the combustor system were observed, which correspond to typical acoustic resonant modes (LF mode, C1/4 mode and P1/2 mode) of the combustor system. The combustion instability is in the longitudinal mode. Furthermore, the structure of downstream hot burnt gas under stable combustion and unstable combustion is studied by imaging of visible light and near-infrared light. Results show that there is a significant difference in the downstream flow under stable combustion and unstable combustion. The DMD spectrum of the flame and the downstream hot burnt gas obtained is the same, which is close to the characteristic frequency of acoustic pressure captured by the microphone signal. The visible light and near-infrared light imaging observation method adopted in this paper provides a new imaging method for the investigation of thermo-acoustic instability.

Lead selenide quantum dots and carbon dots amplify solar conversion capability of a TiO2/CdS photoanode

2015 ◽  
Vol 3 (41) ◽  
pp. 20715-20726 ◽  
Author(s):  
Ramesh K. Kokal ◽  
P. Naresh Kumar ◽  
Melepurath Deepa ◽  
Avanish Kumar Srivastava
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Power Conversion Efficiency ◽  
Carbon Dots ◽  
Near Infrared ◽  
Power Conversion ◽  
Integrated Approach ◽  
Infrared Light ◽  
Cds Quantum Dots ◽  
Solar Conversion

An integrated approach involving the use of visible light absorbing CdS quantum dots (QDs) and near infrared light harvesting PbSe QDs, along with highly conducting carbon dots (C-dots), resulting in impressive power conversion efficiency (PCE) is presented.

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