scholarly journals Giant Alloyed Hot Injection Shells Enable Ultralow Optical Gain Threshold in Colloidal Quantum Wells

ACS Nano ◽  
2019 ◽  
Vol 13 (9) ◽  
pp. 10662-10670 ◽  
Author(s):  
Yemliha Altintas ◽  
Kivanc Gungor ◽  
Yuan Gao ◽  
Mustafa Sak ◽  
Ulviyya Quliyeva ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Optical Gain ◽  
Hot Injection ◽  
Gain Threshold

scholarly journals Sub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shelling

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Nima Taghipour ◽  
Savas Delikanli ◽  
Sushant Shendre ◽  
Mustafa Sak ◽  
Mingjie Li ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Optical Gain ◽  
Semiconductor Quantum Wells ◽  
Colloidal Semiconductor ◽  
Gain Threshold

Band structure and optical gain in InGaAsN∕GaAs and InGaAsN∕GaAsN quantum wells

2003 ◽  
Vol 150 (1) ◽  
pp. 25 ◽  
Author(s):  
X. Marie ◽  
J. Barrau ◽  
T. Amand ◽  
H. Carrère ◽  
A. Arnoult ◽  
...  
Keyword(s):  
Band Structure ◽  
Quantum Wells ◽  
Optical Gain

Feasibility Of Novel Si-Based Interminiband Lasers

1998 ◽  
Vol 533 ◽  
Author(s):  
Gregory Sun ◽  
Lionel Friedman ◽  
Richard A. Soref
Keyword(s):  
Quantum Wells ◽  
Current Density ◽  
Population Inversion ◽  
Heavy Hole ◽  
Optical Gain ◽  
Laser Structure ◽  
Strained Si ◽  
Superlattice Structures ◽  
A Current

AbstractWe have designed a parallel interminiband lasing in superlattice structures of coherently strained Si0.5Ge0.5/Si quantum wells (QWs). Population inversion is achieved between the non-parabolic heavy-hole valence minibands locally in-k-space. Lasing transition is at 5.4μm. Our analysis indicates that an optical gain of 134/cm can be obtained when the laser structure is pumped with a current density of 5kA/cm2.

scholarly journals Record High External Quantum Efficiency of 19.2% Achieved in Light-Emitting Diodes of Colloidal Quantum Wells Enabled by Hot-Injection Shell Growth

2019 ◽  
Author(s):  
Baiquan Liu ◽  
Yemliha Altintas ◽  
Lin Wang ◽  
Sushant Shendre ◽  
Manoj Sharma ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Performance ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Shell Growth ◽  
Light Emitting ◽  
Hot Injection ◽  
Key Factor

<p> Colloidal quantum wells (CQWs) are regarded as a new, highly promising class of optoelectronic materials thanks to their unique excitonic characteristics of high extinction coefficient and ultranarrow emission bandwidth. Although the exploration of CQWs in light-emitting diodes (LEDs) is impressive, the performance of CQW-LEDs lags far behind compared with other types of LEDs (e.g., organic LEDs, colloidal quantum-dot LEDs, and perovskite LEDs). Herein, for the first time, the authors show high-efficiency CQW-LEDs reaching close to the theoretical limit. A key factor for this high performance is the exploitation of hot-injection shell (HIS) growth of CQWs, which enables a near-unity photoluminescence quantum yield (PLQY), reduces nonradiative channels, ensures smooth films and enhances the stability. Remarkably, the PLQY remains 95% in solution and 87% in film despite rigorous cleaning. Through systematically understanding their shape-, composition- and device- engineering, the CQW-LEDs using CdSe/Cd<sub>0.25</sub>Zn<sub>0.75</sub>S core/HIS CQWs exhibit a maximum external quantum efficiency of 19.2%. Additionally, a high luminance of 23,490 cd m<sup>-2</sup>, extremely saturated red color with the Commission Internationale de L’Eclairage coordinates of (0.715, 0.283) and stable emission are obtained. The findings indicate that HIS grown CQWs enable high-performance solution-processed LEDs, which may pave the path for CQW-based display and lighting technologies.</p>

Optical gain in (Zn,Cd)SeZn(S,Se) quantum wells as a function of temperature

1998 ◽  
Vol 184-185 ◽  
pp. 623-626
Author(s):  
F.P. Logue ◽  
P. Rees ◽  
C. Jordan ◽  
J.F. Donegan ◽  
J. Hegarty ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Optical Gain

Thermal characteristics of optical gain for GaInNAs quantum wells at 1.3 μm

2001 ◽  
Vol 79 (19) ◽  
pp. 3038-3040 ◽  
Author(s):  
Chang Kyu Kim ◽  
Yong Hee Lee
Keyword(s):  
Quantum Wells ◽  
Thermal Characteristics ◽  
Optical Gain

OPTICAL GAIN AND ENERGY BAND STRUCTURE OF PHOTONIC CRYSTAL VCSELs WITH HIGH-INDEX-CONTRAST SUBWAVELENGTH GRATINGS

2014 ◽  
Vol 02 (02) ◽  
pp. 1440014
Author(s):  
J. CHEN ◽  
W. J. FAN ◽  
Q. J. WANG ◽  
MARCIN GEBSKI ◽  
MACIEJ DEMS ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Quantum Wells ◽  
Optical Gain ◽  
High Index ◽  
Cavity Surface ◽  
Subwavelength Gratings ◽  
Vertical Cavity Surface ◽  
Index Contrast ◽  
High Index Contrast ◽  
Valence Bands

Photonic crystal vertical-cavity surface-emitting laser structure with incorporation of high-index-contrast subwavelength gratings is fabricated and the three quantum well active region of the structure is investigated with 8 band k.p model. The dispersion of energy sub-bands and wave functions in the conduction bands and valence bands indicate that effective overlapping and interactions between electrons and holes can be realized in the quantum wells and that the maximum spontaneous emission rate and optical gain occurs at the expected wavelength, which is confirmed by the measured photoluminescence spectrum.

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