Extra green light induced ZnO ultraviolet lasing enhancement assisted by Au surface plasmons

Nanoscale ◽  
2018 ◽  
Vol 10 (2) ◽  
pp. 623-627 ◽  
Author(s):  
F. F. Qin ◽  
C. X. Xu ◽  
Q. X. Zhu ◽  
J. F. Lu ◽  
D. T. You ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Optical Properties ◽  
Laser Beam ◽  
Surface Plasmons ◽  
Green Light ◽  
Light Excitation ◽  
Beam Excitation

A hybrid Au/ZnO microcavity was constructed and made the optical properties of the microcavity improve under single and multi-laser beam excitation because of LSP induced electron transfer. Utilizing this mechanism, we realized an even further improvement of the tunable lasing behavior through extra green light excitation.

scholarly journals Green Light Emission ofZnxCd1-xSeNanocrystals Synthesized by One-Pot Method

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Shu-Ru Chung ◽  
Kuan-Wen Wang ◽  
Hong-Shuo Chen
Keyword(s):  
Particle Size ◽  
Optical Properties ◽  
Light Emission ◽  
Green Light ◽  
Particle Size Effect ◽  
Partial Replacement ◽  
Face Centered Cubic ◽  
One Pot ◽  
Zn Content ◽  
High Emission

We present a facile one-pot synthesis to prepare ternaryZnxCd1-xSe(x= 0.2, 0.5, 0.8, and 1) nanocrystals (NCs) with high emission quantum yield (QY, 45~89%). The effect of Zn content (x) ofZnxCd1-xSeNCs on their physical properties is investigated. The NCs have a particle size of 3.2 nm and face centered cubic structure. However, the actual compositions of the NCs are Zn0.03Cd0.97Se, Zn0.11Cd0.89Se, and Zn0.38Cd0.62Se when Zn content is 0.2, 0.5, and 0.8, respectively. In terms of the optical properties, the emission wavelength shifts from 512 to 545 nm with increasing Zn content from 0 to 0.8 while the QY changes from 89 to 45, respectively. Partial replacement of Cd by Zn is beneficial to improve the QY of Zn0.2and Zn0.5NCs. The optical properties of ternary NCs are affected by compositional effect rather than particle size effect.

Luminescence Properties of InGaN/GaN Green Light-Emitting Diodes with Si-Doped Graded Short-Period Superlattice

2021 ◽  
Vol 21 (11) ◽  
pp. 5648-5652
Author(s):  
ll-Wook Cho ◽  
Bom Lee ◽  
Kwanjae Lee ◽  
Jin Soo Kim ◽  
Mee-Yi Ryu
Keyword(s):  
Optical Properties ◽  
Decay Time ◽  
Stark Effect ◽  
Light Emitting Diodes ◽  
Green Light ◽  
Time Resolved ◽  
Light Emitting ◽  
Quantum Confined Stark Effect ◽  
Short Period ◽  
Si Doped

The optical properties of InGaN/GaN green light-emitting diodes (LEDs) with an undoped graded short-period superlattice (GSL) and a Si-doped GSL (SiGSL) were investigated using photoluminescence (PL) and time-resolved PL spectroscopies. For comparison, an InGaN/GaN conventional LED (CLED) without the GSL structure was also grown. The SiGSL sample showed the strongest PL intensity and the largest PL peak energy because of band-filling effect and weakened quantum- confined stark effect (QCSE). PL decay time of SiGSL sample at 10 K was shorter than those of the CLED and GSL samples. This finding was attributed to the oscillator strength enhancement by the reduced QCSE due to the Coulomb screening by Si donors. In addition, the SiGSL sample exhibited the longest decay time at 300 K, which was ascribed to the reduced defect and dislocation density. These results indicate that insertion of the Si-doped GSL structure is an effective strategy for improving the optical properties in InGaN/GaN green LEDs.

Exploring Structural Dynamics and Optical Properties of UnaG Fluorescent Protein upon N57 Mutations

2021 ◽  
Author(s):  
Mohammad Asad ◽  
Adèle D Laurent
Keyword(s):  
Optical Properties ◽  
Structural Dynamics ◽  
Fluorescent Protein ◽  
Green Light ◽  
Endogenous Ligand ◽  
New Class ◽  
Fluorescence Protein

UnaG is a new class of fluorescence protein for which an endogenous ligand namely bilirubin (BLR) is playing the role of the chromophore. Upon photoexcitation, holoUnaG emits the green light....

scholarly journals 120 Vibration Mode Analysis of Thin Film Resonator under Laser Beam Excitation

2001 ◽  
Vol 2001.50 (0) ◽  
pp. 39-40
Author(s):  
Toshihiro Kobayashi ◽  
Jun Ohsawa ◽  
Naohiro Yamaguchi ◽  
Tamio Hara
Keyword(s):  
Thin Film ◽  
Laser Beam ◽  
Vibration Mode ◽  
Mode Analysis ◽  
Beam Excitation

Optical properties of laser sintered polyamide 12

2015 ◽  
Vol 21 (4) ◽  
pp. 443-448 ◽  
Author(s):  
Mengqi Yuan ◽  
David L. Bourell
Keyword(s):  
Optical Properties ◽  
Plate Thickness ◽  
Monochromatic Light ◽  
Green Light ◽  
Wavelength Dependence ◽  
Light Transmittance ◽  
Content Type ◽  
Light Emitting ◽  
Polyamide 12 ◽  
Lighting Conditions

Purpose – The purpose of this paper is to report selected optical properties of laser sintered polyamide 12 blank plates under different monochromatic and white light conditions and to apply these properties in production of laser sintered lithophanes. Design/methodology/approach – A UNICO 1201E spectrophotometer was used to measure the transmittance of laser sintered polyamide 12 plates as a function of plate thickness. Monochromatic light-emitting diodes were used to assess the wavelength dependence on the transmission and contrast as captured by a SONY DSC-W55 camera. Findings – The transmittance decreased with increasing plate thickness which varied significantly depending on the monochromatic wavelength. Highest transmission was observed using green light (525 nm) and poorest transmission was measured for yellow light (589 nm). Research limitations/implications – There is a limit to the amount of contrast obtained in polyamide lithophanes because the thickness of the plates is limited to less than about 5 mm. Greater thickness results in discernible topology on the lithophane which impairs the quality of the image. Originality/value – Light transmittance of polyamide 12 plates under different lighting conditions is reported and applied to optically defined laser sintered lithophanes.

Electronic and optical properties of π-bridged perylenediimide derivatives: the role of π-bridges

2019 ◽  
Vol 7 (20) ◽  
pp. 12532-12537 ◽  
Author(s):  
Yuan Guo ◽  
Guangchao Han ◽  
Zeyi Tu ◽  
Yuanping Yi
Keyword(s):  
Electron Transfer ◽  
Optical Properties ◽  
Exchange Mechanism ◽  
Intramolecular Electron Transfer ◽  
Electronic And Optical Properties

For the π-bridged multi-PDI derivatives, intramolecular electron transfer is dictated by the super-exchange mechanism and can be greatly tuned by the π-bridge modes.

scholarly journals Oxidation of ablated silicon during pulsed laser deposition in a background gas with different oxygen partial pressures

2019 ◽  
Vol 196 ◽  
pp. 00008
Author(s):  
Sergey V. Starinskiy ◽  
Alexey A. Rodionov ◽  
Yuri G. Shukhov ◽  
Alexander V. Bulgakov
Keyword(s):  
Optical Properties ◽  
Laser Beam ◽  
Pulsed Laser Deposition ◽  
Oxidation State ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Oxidation Degree ◽  
Total Oxidation ◽  
Partial Pressures ◽  
Background Gas

We have analysed changes in the oxidation state of SiOx films produced by pulsed laser deposition in a background gas with different partial pressures of oxygen. The optical properties of the films in IR range are shown to be close to those of SiO2 while the total oxidation degree is considerably less than 2. It is suggested that the film consists of oxidized and unoxidized regions due to preferential oxidation of the periphery of the silicon ablation plume during expansion. These regions are overlapping in the film if the laser beam is scanned on the target.

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