Long-wavelength light emission and lasing from InAs∕GaAs quantum dots covered by a GaAsSb strain-reducing layer

2005 ◽  
Vol 86 (14) ◽  
pp. 143108 ◽  
Author(s):  
H. Y. Liu ◽  
M. J. Steer ◽  
T. J. Badcock ◽  
D. J. Mowbray ◽  
M. S. Skolnick ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Emission ◽  
Long Wavelength ◽  
Wavelength Light

Long-wavelength light emission from self-assembled heterojunction quantum dots

2008 ◽  
Vol 103 (9) ◽  
pp. 094315 ◽  
Author(s):  
Zhiqiang Zhou ◽  
Yingqiang Xu ◽  
Ruiting Hao ◽  
Bao Tang ◽  
Zhengwei Ren ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Emission ◽  
Long Wavelength ◽  
Self Assembled ◽  
Wavelength Light

Facile synthesis of yellow fluorescent carbon dots for highly sensitive sensing of cobalt ions and biological imaging

2019 ◽  
Vol 11 (32) ◽  
pp. 4077-4083 ◽  
Author(s):  
Min Tian ◽  
Yaoming Liu ◽  
Yingte Wang ◽  
Yong Zhang
Keyword(s):  
Light Emission ◽  
Biological Imaging ◽  
Cobalt Ions ◽  
Long Wavelength ◽  
Scattering Effects ◽  
Highly Sensitive ◽  
Penetration Ability ◽  
Weak Light ◽  
Fluorescent Carbon Dots ◽  
Wavelength Light

Long-wavelength light emission has been garnering extensive attention in terms of strong tissue penetration ability and weak light scattering effects.

scholarly journals Проявления процессов резонансного туннелирования и случайных флуктуаций потенциала с участием уровней квантовых точек в релаксации фототока p-i-n GaAs/AlAs-гетероструктур

2021 ◽  
Vol 55 (10) ◽  
pp. 950
Author(s):  
Ю.Н. Ханин ◽  
Е.Е. Вдовин
Keyword(s):  
Quantum Dots ◽  
Resonant Tunneling ◽  
Charge Accumulation ◽  
Time Intervals ◽  
Long Wavelength ◽  
Barrier Layers ◽  
Local Fluctuations ◽  
Relaxation Curves ◽  
Random Fluctuations ◽  
Wavelength Light

As a result of studying the relaxation of the photocurrent in p-i-n GaAs / AlAs heterostructures, we discovered/ registered sharp features caused by resonant tunneling through the electronic levels of quantum dots in the barrier layers. It was shown that the time intervals of the manifestation of these resonances on the relaxation curves are determined by the dynamics of charge accumulation at the hole levels of quantum dots and by recombination with their participation.Strong random fluctuations of the photocurrent in the postresonant region, caused by local fluctuations of the residual charge at the hole levels of quantum dots, were also found.The study of relaxation in the medium and long wavelength light ranges confirms our interpretation of the observed effects.

scholarly journals Relief of excited-state antiaromaticity enables the smallest red emitter

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Heechan Kim ◽  
Woojin Park ◽  
Younghun Kim ◽  
Michael Filatov ◽  
Cheol Ho Choi ◽  
...  
Keyword(s):  
Excited State ◽  
Light Emission ◽  
Molecular Design ◽  
Intramolecular Charge Transfer ◽  
Light Emitters ◽  
Long Wavelength ◽  
New Class ◽  
Color Spectrum ◽  
Stokes Shifts ◽  
Wavelength Light

AbstractIt is commonly accepted that a large π-conjugated system is necessary to realize low-energy electronic transitions. Contrary to this prevailing notion, we present a new class of light-emitters utilizing a simple benzene core. Among different isomeric forms of diacetylphenylenediamine (DAPA), o- and p-DAPA are fluorescent, whereas m-DAPA is not. Remarkably, p-DAPA is the lightest (FW = 192) molecule displaying red emission. A systematic modification of the DAPA system allows the construction of a library of emitters covering the entire visible color spectrum. Theoretical analysis shows that their large Stokes shifts originate from the relief of excited-state antiaromaticity, rather than the typically assumed intramolecular charge transfer or proton transfer. A delicate interplay of the excited-state antiaromaticity and hydrogen bonding defines the photophysics of this new class of single benzene fluorophores. The formulated molecular design rules suggest that an extended π-conjugation is no longer a prerequisite for a long-wavelength light emission.

Dual-Wavelength Light Emission from CdSe/ZnS Quantum Dots on Blue Light-Emitting Diodes

2015 ◽  
Vol 15 (12) ◽  
pp. 10037-10040 ◽  
Author(s):  
Tae Hoon Seo ◽  
Ah Hyun Park ◽  
Seul Bee Lee ◽  
Gun Hee Lee ◽  
Myung Jong Kim ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Dual Wavelength ◽  
Light Emitting ◽  
Wavelength Light

scholarly journals Coordination between Surface Lattice Resonances of Poly(glycidyl Methacrylate) Line Array and Surface Plasmon Resonances of CdS Quantum on Silicon Surface

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 558
Author(s):  
Shuenn-Kung Su ◽  
Feng-Ping Lin ◽  
Chih-Feng Huang ◽  
Chien-Hsing Lu ◽  
Jem-Kun Chen
Keyword(s):  
Quantum Dots ◽  
Hybrid System ◽  
Glycidyl Methacrylate ◽  
Light Emission ◽  
Plasmonic Nanostructures ◽  
Surface Plasmon Resonances ◽  
One Dimensional ◽  
Line Array ◽  
Plasmon Resonances ◽  
Wavelength Light

In this work, a unique hybrid system is proposed for one-dimensional gratings comprising of poly(glycidyl methacrylate) (PGMA) brushes and CdS quantum dots (CQDs). Generally, the emission of QDs is too weak to be observed in a dry state. Plasmonic resonances of the grating structures can be used to enhance the light emission or absorption of CQDs. The interaction between PGMA plasmonic nanostructures and inorganic CQDs plays a crucial role in engineering the light harvest, notably for optoelectronic applications. Extinction measurements of the hybrid system consisting of a PGMA grating and CQDs are reported. We designed one-dimensional gratings with various resolutions to tune the absorptance peaks of grating. PGMA grating grafted from a 1.5 µm resolution of trench arrays of photoresist exhibited absorptance peak at 395 nm, close to the absorption peak of CQDs, resulting in the photoluminescence enhancement of CQDs on the grating due to high charge carriers’ recombination rate. Generally, the emission of quantum dots occurs under irradiation at characteristic wavelengths. Immobilizing QDs on the grating facilitates the emission of QDs under irradiation of full-wavelength light. Furthermore, the PGMA gratings with CQDs were immersed in various solvents to change the geometries resulting the shift of absorptance peak of grating. The proposed method could be applied for sensing the nature of the surrounding media and vice versa, as well as for various media of solvents.

InAs/InGaAs quantum dots confined by InAlAs barriers for enhanced room temperature light emission: Photoelectric properties and deep levels

2021 ◽  
Vol 238 ◽  
pp. 111514
Author(s):  
Sergii Golovynskyi ◽  
Oleksandr I. Datsenko ◽  
Luca Seravalli ◽  
Giovanna Trevisi ◽  
Paola Frigeri ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Light Emission ◽  
Deep Levels ◽  
Photoelectric Properties
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