scholarly journals Effect of Passivation Layer on the Thin Film Perovskite Random Lasers

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2322
Author(s):  
Subha Prakash Mallick ◽  
Yu-Heng Hong ◽  
Lih-Ren Chen ◽  
Tsung Sheng Kao ◽  
Tien-Chang Lu
Keyword(s):  
Air Force ◽  
Room Temperature ◽  
High Surface ◽  
Spatial Coherence ◽  
Random Lasing ◽  
Random Lasers ◽  
Scattering Effects ◽  
Low Threshold ◽  
Projection Images ◽  
Multiple Scattering Effects

Novel functionalities of disorder-induced scattering effect in random lasers, attributed to low spatial coherence, draw remarkable attention in high-contrast to superior quality speckle-free imaging applications. This paper demonstrates perovskite-polystyrene (PS)-based random lasing action with robust optical performance at room temperature. Optical characterizations are carried out upon perovskite thin films addition with polystyrene of different mixing concentrations (wt.%). A low threshold lasing operation is achieved with an increasing concentration of polystyrene, accompanying a wavy surface texture with high surface roughness. The rough surface dominating multiple scattering effects leads to enhanced feedback efficiency. Moreover, this study also elucidates efficient fabrication process steps for the development of high quality and durable PS-based random lasers. With the advantages of reduced coherent artifacts and low spatial coherence, speckle free projection images of the USAF (U. S. Air Force MIL-STD-150A standard of 1951) resolution test chart are shown for different PS-based random lasers.

scholarly journals Pump-Controlled Plasmonic Random Lasers from Dye-Doped Nematic Liquid Crystals with TiN Nanoparticles in Non-Oriented Cells

2019 ◽  
Vol 10 (1) ◽  
pp. 199 ◽  
Author(s):  
Yuan Wan ◽  
Luogen Deng
Keyword(s):  
Liquid Crystals ◽  
Emission Spectrum ◽  
Localized Surface Plasmon Resonance ◽  
Nematic Liquid Crystals ◽  
Localized Surface Plasmon ◽  
Random Lasing ◽  
Random Lasers ◽  
Tin Nanoparticles ◽  
Low Threshold ◽  
Underlying Mechanisms

Manipulation of the performance of the random lasers from dye-doped nematic liquid crystals with TiN nanoparticles in non-oriented cells is studied. The experimental results show that the introduction of TiN nanoparticles into dye-doped nematic liquid crystals significantly reduces the threshold of random lasing due to the localized surface plasmon resonance of TiN nanoparticles. The emission spectrum of random lasers can be controlled by the shape of the pump spot. The threshold of random lasers increases with the decrease of the length of pump stripe. In order to obtain the emission spectrum with fine discrete sharp peaks, the narrow pump stripe is more effective than the circular pump spot. When the pump area is more like a circle, the emission spectrum is more like an amplified spontaneous emission. The underlying mechanisms of these phenomena are discussed in detail. This study provides a promising platform for designing the high-quality and low-threshold random lasers which can be controlled by the shape of the pump spot.

Random lasing realized in n-ZnO/p-MgZnO core–shell nanowire heterostructures

CrystEngComm ◽  
2015 ◽  
Vol 17 (21) ◽  
pp. 3917-3922 ◽  
Author(s):  
Ying-Jie Lu ◽  
Chong-Xin Shan ◽  
Ming-Ming Jiang ◽  
Guang-Chong Hu ◽  
Nan Zhang ◽  
...  
Keyword(s):  
Core Shell ◽  
Random Lasing ◽  
Random Lasers ◽  
Nanowire Heterostructures ◽  
Electrically Pumped ◽  
Low Threshold

Low threshold electrically pumped random lasers were realized in n-ZnO/p-MgZnO core–shell nanowire heterostructures.

MULTIPLE SCATTERING EFFECTS IN THE COBALT K-EDGE EXAFS OF METAL CARBONYL COMPLEXES

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-589-C8-592
Author(s):  
N. BINSTED ◽  
S. L. COOK ◽  
J. EVANS ◽  
R. J. PRICE ◽  
G. N. GREAVES
Keyword(s):  
Multiple Scattering ◽  
Metal Carbonyl ◽  
Carbonyl Complexes ◽  
Metal Carbonyl Complexes ◽  
Scattering Effects ◽  
Multiple Scattering Effects

scholarly journals Understanding Sulfur Redox Mechanisms in Different Electrolytes for Room-Temperature Na–S Batteries

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Hanwen Liu ◽  
Wei-Hong Lai ◽  
Qiuran Yang ◽  
Yaojie Lei ◽  
Can Wu ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Surface ◽  
Reversible Capacity ◽  
High Loading ◽  
Side Reactions ◽  
Liquid Sulfur ◽  
Shuttle Effect ◽  
Loading Ratio ◽  
Solid Liquid ◽  
Sulfur Cathodes

Abstract This work reports influence of two different electrolytes, carbonate ester and ether electrolytes, on the sulfur redox reactions in room-temperature Na–S batteries. Two sulfur cathodes with different S loading ratio and status are investigated. A sulfur-rich composite with most sulfur dispersed on the surface of a carbon host can realize a high loading ratio (72% S). In contrast, a confined sulfur sample can encapsulate S into the pores of the carbon host with a low loading ratio (44% S). In carbonate ester electrolyte, only the sulfur trapped in porous structures is active via ‘solid–solid’ behavior during cycling. The S cathode with high surface sulfur shows poor reversible capacity because of the severe side reactions between the surface polysulfides and the carbonate ester solvents. To improve the capacity of the sulfur-rich cathode, ether electrolyte with NaNO3 additive is explored to realize a ‘solid–liquid’ sulfur redox process and confine the shuttle effect of the dissolved polysulfides. As a result, the sulfur-rich cathode achieved high reversible capacity (483 mAh g−1), corresponding to a specific energy of 362 Wh kg−1 after 200 cycles, shedding light on the use of ether electrolyte for high-loading sulfur cathode.

scholarly journals Low Threshold Room Temperature Polariton Lasing from Fluorene‐Based Oligomers

2021 ◽  
pp. 2100028
Author(s):  
Mengjie Wei ◽  
Arvydas Ruseckas ◽  
Van T. N. Mai ◽  
Atul Shukla ◽  
Ilene Allison ◽  
...  
Keyword(s):  
Room Temperature ◽  
Low Threshold

scholarly journals Low-threshold strain-compensated InGaAs/(In,Al)GaAs multi-quantum well nanowire lasers emitting near 1.3 μm at room temperature

2021 ◽  
Vol 118 (22) ◽  
pp. 221103
Author(s):  
P. Schmiedeke ◽  
A. Thurn ◽  
S. Matich ◽  
M. Döblinger ◽  
J. J. Finley ◽  
...  
Keyword(s):  
Quantum Well ◽  
Room Temperature ◽  
Threshold Strain ◽  
Low Threshold ◽  
Nanowire Lasers ◽  
Multi Quantum Well

Low threshold, room temperature pulsed and quasi-continuous lasing in optically pumped CdZnTe/ZnTe quantum wells

1993 ◽  
Vol 22 (5) ◽  
pp. 479-484 ◽  
Author(s):  
R. D. Feldman ◽  
T. D. Harris ◽  
J. E. Zucker ◽  
D. Lee ◽  
R. F. Austin ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Room Temperature ◽  
Optically Pumped ◽  
Low Threshold

scholarly journals Accurate Electron Drift Mobility Measurements in Moderately Dense Helium Gas at Several Temperatures

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 52
Author(s):  
Armando Francesco Borghesani
Keyword(s):  
Weak Localization ◽  
Drift Mobility ◽  
Zero Field ◽  
Scattering Effects ◽  
Helium Gas ◽  
Excellent Description ◽  
Intermediate Density ◽  
Electron Drift Mobility ◽  
Multiple Scattering Effects ◽  
Density Regime

We report new accurate measurements of the drift mobility μ of quasifree electrons in moderately dense helium gas in the temperature range 26K≤T≤300K for densities lower than those at which states of electrons localized in bubbles appear. By heuristically including multiple-scattering effects into classical kinetic formulas, as previously done for neon and argon, an excellent description of the field E, density N, and temperature T dependence of μ is obtained. Moreover, the experimental evidence suggests that the strong decrease of the zero-field density-normalized mobility μ0N with increasing N from the low up to intermediate density regime is mainly due to weak localization of electrons caused by the intrinsic disorder of the system, whereas the further decrease of μ0N for even larger N is due to electron self-trapping in cavities. We suggest that a distinction between weakly localized and electron bubble states can be done by inspecting the behavior of μ0N as a function of N at intermediate densities.

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