Optically pumped lasing from localized states in quantum-well and quantum-dot microdisks

2005 ◽  
Author(s):  
T. Kipp
Keyword(s):  
Quantum Dot ◽  
Quantum Well ◽  
Localized States ◽  
Optically Pumped

Excitonic Enhanced Optical Gain Of GaN/AlGaN Quantum Wells With Localized States

1997 ◽  
Vol 482 ◽  
Author(s):  
Takeshi Uenoyama
Keyword(s):  
Quantum Dot ◽  
Quantum Well ◽  
Quantum Wells ◽  
Carrier Density ◽  
Optical Gain ◽  
Localized States ◽  
Many Body ◽  
Quantum Well Structures ◽  
The Many ◽  
Temperature Green’S Function

AbstractWe have evaluated the optical gain of GaN/AlGaN quantum well structures with localized states, taking into account the Coulomb interaction. The localized states axe introduced in the well as quantum dot-like subband states. We have used the temperature Green's function formalism to treat the many-body effects and have found a new excitonic enhancement of the optical gain involved the localized states. This enhancement is stronger than the conventional Coulomb enhancement. It might play an important role to reduce the threshold carrier density.

Low-Temperature Operation of Green, Blue and UV InGaN/GaN Multiple-Quantum-Well Light-Emitting Diodes

2003 ◽  
Vol 764 ◽  
Author(s):  
X. A. Cao ◽  
S. F. LeBoeuf ◽  
J. L. Garrett ◽  
A. Ebong ◽  
L. B. Rowland ◽  
...  
Keyword(s):  
Quantum Well ◽  
Light Emitting Diodes ◽  
Multiple Quantum Well ◽  
Light Output ◽  
Localized States ◽  
Multiple Quantum ◽  
Nonradiative Recombination ◽  
Light Emitting ◽  
Temperature Range ◽  
Green Leds

Absract:Temperature-dependent electroluminescence (EL) of InGaN/GaN multiple-quantum-well light-emitting diodes (LEDs) with peak emission energies ranging from 2.3 eV (green) to 3.3 eV (UV) has been studied over a wide temperature range (5-300 K). As the temperature is decreased from 300 K to 150 K, the EL intensity increases in all devices due to reduced nonradiative recombination and improved carrier confinement. However, LED operation at lower temperatures (150-5 K) is a strong function of In ratio in the active layer. For the green LEDs, emission intensity increases monotonically in the whole temperature range, while for the blue and UV LEDs, a remarkable decrease of the light output was observed, accompanied by a large redshift of the peak energy. The discrepancy can be attributed to various amounts of localization states caused by In composition fluctuation in the QW active regions. Based on a rate equation analysis, we find that the densities of the localized states in the green LEDs are more than two orders of magnitude higher than that in the UV LED. The large number of localized states in the green LEDs are crucial to maintain high-efficiency carrier capture at low temperatures.

Gain-length scaling in quantum dot/quantum well infrared photodetectors

2009 ◽  
Vol 95 (9) ◽  
pp. 093502 ◽  
Author(s):  
T. Yamanaka ◽  
B. Movaghar ◽  
S. Tsao ◽  
S. Kuboya ◽  
A. Myzaferi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Well ◽  
Infrared Photodetectors ◽  
Quantum Well Infrared Photodetectors ◽  
Gain Length ◽  
Length Scaling

Investigation of the Internal Heterostructure of Highly Luminescent Quantum Dot−Quantum Well Nanocrystals

2009 ◽  
Vol 131 (2) ◽  
pp. 470-477 ◽  
Author(s):  
Pralay K. Santra ◽  
Ranjani Viswanatha ◽  
Steve M. Daniels ◽  
Nigel L. Pickett ◽  
Jason M. Smith ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Well

Quantum well and quantum dot infrared photodetectors: physics of operation and modeling

2003 ◽  
Author(s):  
Victor Ryzhii ◽  
Maxim Ryzhii ◽  
Irina Khmyrova ◽  
Robert Suris ◽  
Vladimir Mitin ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Well ◽  
Infrared Photodetectors ◽  
Quantum Dot Infrared Photodetectors

scholarly journals Optically pumped terahertz laser based on intersubband transitions in a GaN∕AlGaN double quantum well

2005 ◽  
Vol 97 (10) ◽  
pp. 103106 ◽  
Author(s):  
N. Vukmirović ◽  
V. D. Jovanović ◽  
D. Indjin ◽  
Z. Ikonić ◽  
P. Harrison ◽  
...  
Keyword(s):  
Quantum Well ◽  
Double Quantum ◽  
Intersubband Transitions ◽  
Optically Pumped ◽  
Double Quantum Well
Sign in / Sign up

Export Citation Format

Share Document