scholarly journals Structure‐guided evolution of Green2 toward photostability and quantum yield enhancement by F145Y substitution

2020 ◽  
Vol 29 (9) ◽  
pp. 1964-1974
Author(s):  
Tingting Sun ◽  
Tianpeng Li ◽  
Ke Yi ◽  
Xiaolian Gao
Keyword(s):  
Quantum Yield ◽  
Yield Enhancement

scholarly journals Monte Carlo Modeling and Design of Photon Energy Attenuation Layers for >10× Quantum Yield Enhancement in Si-Based Hard X-ray Detectors

Instruments ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 17
Author(s):  
Eldred Lee ◽  
Kaitlin M. Anagnost ◽  
Zhehui Wang ◽  
Michael R. James ◽  
Eric R. Fossum ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Quantum Yield ◽  
Photon Energy ◽  
High Efficiency ◽  
High Energy ◽  
Yield Enhancement ◽  
X Ray ◽  
Simulation Results ◽  
Conversion Efficiencies

High-energy (>20 keV) X-ray photon detection at high quantum yield, high spatial resolution, and short response time has long been an important area of study in physics. Scintillation is a prevalent method but limited in various ways. Directly detecting high-energy X-ray photons has been a challenge to this day, mainly due to low photon-to-photoelectron conversion efficiencies. Commercially available state-of-the-art Si direct detection products such as the Si charge-coupled device (CCD) are inefficient for >10 keV photons. Here, we present Monte Carlo simulation results and analyses to introduce a highly effective yet simple high-energy X-ray detection concept with significantly enhanced photon-to-electron conversion efficiencies composed of two layers: a top high-Z photon energy attenuation layer (PAL) and a bottom Si detector. We use the principle of photon energy down conversion, where high-energy X-ray photon energies are attenuated down to ≤10 keV via inelastic scattering suitable for efficient photoelectric absorption by Si. Our Monte Carlo simulation results demonstrate that a 10–30× increase in quantum yield can be achieved using PbTe PAL on Si, potentially advancing high-resolution, high-efficiency X-ray detection using PAL-enhanced Si CMOS image sensors.

Quantum yield enhancement of Mn-doped CsPbCl3 perovskite nanocrystals as luminescent down-shifting layer for CIGS solar cells

Solar Energy ◽  
2020 ◽  
Vol 206 ◽  
pp. 473-478 ◽  
Author(s):  
Fan Sui ◽  
Mingyue Pan ◽  
Zhengyan Wang ◽  
Ming Chen ◽  
Wenjie Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Yield ◽  
Yield Enhancement ◽  
Perovskite Nanocrystals ◽  
Cigs Solar Cells ◽  
Mn Doped

Excellent quantum yield enhancement in luminescent metal-organic layer for sensitive detection of antibiotics in aqueous medium

2021 ◽  
pp. 109961
Author(s):  
Yuan Xu ◽  
Ying-Ying Zhou ◽  
Maoxing Yu ◽  
Yi Xiong ◽  
Xun-Gao Liu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Aqueous Medium ◽  
Sensitive Detection ◽  
Yield Enhancement ◽  
Organic Layer ◽  
Metal Organic

Direct Photolysis of 2-Propanol Vapor

1972 ◽  
Vol 50 (14) ◽  
pp. 2217-2223 ◽  
Author(s):  
O. S. Herasymowych ◽  
A. R. Knight
Keyword(s):  
Quantum Yield ◽  
Wavelength Range ◽  
Exposure Time ◽  
Yield Enhancement ◽  
Quantum Yields ◽  
Unimolecular Decomposition ◽  
Direct Photolysis ◽  
Volatile Products ◽  
Temperature And Pressure

The photolysis of 2-propanol vapor in the 1800–2000 Å wavelength range has been investigated. The volatile products of the reaction and their quantum yields at 80 °C and 200 Torr substrate pressure are H2 (0.64), CH3COCH3 (0.34), CH4 (0.39), CH3CHO (0.29), CO (0.15), and C2H6 (0.08). A mechanism is proposed that accounts for the observed rate variations with substrate pressure, exposure time, temperature, and pressure of inert addend. Acetone and acetaldehyde undergo significant secondary decomposition and this is the source of CO, CH4, and C2H6. Acetaldehyde is formed in the unimolecular decomposition of C3H7O radicals produced in the primary process.The effects of CO2 and CF4 as inert addends have been examined and it has been established that the quantum yield enhancement through collision induced predissociation that has been reported to occur in methanol is not a characteristic of the 2-propanol photolysis.

An experimental and theoretical mechanistic study of biexciton quantum yield enhancement in single quantum dots near gold nanoparticles

Nanoscale ◽  
2015 ◽  
Vol 7 (15) ◽  
pp. 6851-6858 ◽  
Author(s):  
Swayandipta Dey ◽  
Yadong Zhou ◽  
Xiangdong Tian ◽  
Julie A. Jenkins ◽  
Ou Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Gold Nanoparticles ◽  
Quantum Yield ◽  
Yield Enhancement ◽  
Mechanistic Study ◽  
Single Quantum ◽  
Single Quantum Dots

Pressure Dependence of Product Yields in the Direct Photolysis of Methanol Vapor at 1849°Å

1973 ◽  
Vol 51 (1) ◽  
pp. 147-148 ◽  
Author(s):  
O. Sonia Herasymowych ◽  
Arthur R. Knight
Keyword(s):  
Quantum Yield ◽  
Exposure Time ◽  
Pressure Dependence ◽  
High Pressures ◽  
Yield Enhancement ◽  
Direct Photolysis ◽  
Methanol Vapor ◽  
Product Yields

Hydrogen and methane yields from the 1849 Å photolysis of methanol vapor in an all-quartz system have been investigated as a function of exposure time and pressure of CH3OH and added CO2.Product yields are decreased by the inert addend, and by the substrate itself at high pressures, in contrast to the collision-induced quantum yield enhancement reported to be occurring in this system.

Highly Quantum-Yield Enhancement of InP Quantum-Dot Emitting Red-Light Via Potassium Doping for Quantum-Dot Organic-Light-Emitting-Diode Display

2020 ◽  
Vol MA2020-02 (42) ◽  
pp. 2728-2728
Author(s):  
Seungjae Lee ◽  
Jieun Lee ◽  
Changjin Lee ◽  
Jeagun Park
Keyword(s):  
Quantum Yield ◽  
Quantum Dot ◽  
Light Emitting Diode ◽  
Red Light ◽  
Yield Enhancement ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

scholarly journals Quantum Yield Enhancement in Graphene Quantum Dots via Esterification with Benzyl Alcohol

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Suzuka Tachi ◽  
Hiroki Morita ◽  
Misaki Takahashi ◽  
Yusuke Okabayashi ◽  
Takuya Hosokai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Benzyl Alcohol ◽  
Functional Groups ◽  
Photophysical Properties ◽  
Graphene Quantum Dots ◽  
Yield Enhancement ◽  
Light Illumination ◽  
Nonradiative Recombination ◽  
Widespread Application

Abstract The quantum yield of graphene quantum dots was enhanced by restriction of the rotation and vibration of surface functional groups on the edges of the graphene quantum dots via esterification with benzyl alcohol; this enhancement is crucial for the widespread application of graphene quantum dots in light-harvesting devices and optoelectronics. The obtained graphene quantum dots with highly graphene-stacked structures are understood to participate in π–π interactions with adjacent aromatic rings of the benzylic ester on the edges of the graphene quantum dots, thus impeding the nonradiative recombination process in graphene quantum dots. Furthermore, the crude graphene quantum dots were in a gel-like solid form and showed white luminescence under blue light illumination. Our results show the potential for improving the photophysical properties of nanomaterials, such as the quantum yield and band-gap energy for emission, by controlling the functional groups on the surface of graphene quantum dots through an organic modification approach.

Giant Quantum Yield Enhancement in CdS/MgF2/Ag Hybrid Nanobelt under Two-Photon Excitation

ACS Photonics ◽  
2020 ◽  
Vol 7 (11) ◽  
pp. 2987-2994
Author(s):  
Xiangyuan Xing ◽  
Kai Wang ◽  
Xiaobo Han ◽  
Shuhang Qian ◽  
Kun Wang ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Yield Enhancement ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation
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