Very Low Threshold of Amplified Spontaneous Emission in II-VI Colloidal Quantum Dots at Low Exciton Number

2010 ◽  
Author(s):  
Cuong Dang ◽  
A.V. Nurmikko
Keyword(s):  
Quantum Dots ◽  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Colloidal Quantum Dots ◽  
Low Threshold

Low threshold amplified spontaneous emission from tin oxide quantum dots: a instantiation of dipole transition silence semiconductors

Nanoscale ◽  
2013 ◽  
Vol 5 (23) ◽  
pp. 11561 ◽  
Author(s):  
Shu Sheng Pan ◽  
Siu Fung Yu ◽  
Wen Fei Zhang ◽  
Hai Zhu ◽  
Wei Lu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spontaneous Emission ◽  
Tin Oxide ◽  
Amplified Spontaneous Emission ◽  
Dipole Transition ◽  
Low Threshold

scholarly journals Blue- and red-shifting amplified spontaneous emission of CdSe/CdS core/shell colloidal quantum dots

CLEO: 2013 ◽  
2013 ◽  
Author(s):  
Yusuf Kelestemur ◽  
Ahmet Fatih Cihan ◽  
Burak Guzelturk ◽  
Ozan Yerli ◽  
Ulas Kurum ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Colloidal Quantum Dots ◽  
Core Shell

scholarly journals Electrically control amplified spontaneous emission in colloidal quantum dots

2019 ◽  
Vol 5 (10) ◽  
pp. eaav3140 ◽  
Author(s):  
Junhong Yu ◽  
Sushant Shendre ◽  
Weon-kyu Koh ◽  
Baiquan Liu ◽  
Mingjie Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spontaneous Emission ◽  
Auger Recombination ◽  
Low Cost ◽  
Amplified Spontaneous Emission ◽  
Edge State ◽  
Equation Model ◽  
Colloidal Quantum Dots ◽  
Lasing Threshold ◽  
Light Amplification

Colloidal quantum dots (CQDs) are highly promising materials for light amplification thanks to their efficient photoluminescence, tunable emission wavelength and low-cost synthesis. Unfortunately, CQDs are suffering from band-edge state degeneracy which demands multiple excitons to achieve population inversion. As a result, non-radiative Auger recombination increases the lasing threshold and limits the gain lifetime. Here, benefiting from the negative charging, we demonstrate that the amplified spontaneous emission (ASE) threshold is controllable in a device where CQD film is exposed to an external electric field. Specifically, singly charged CQDs lower the threshold due to the preexisting electron in the conduction band, while strongly enhanced Auger recombination in doubly charged CQDs stymies the ASE. Experimental results and kinetic equation model show that ASE threshold reduces 10% even if our device only charges ~17% of the CQD population. Our results open new possibilities for controlling exciton recombination dynamics and achieving electrically pumped CQD lasers.

scholarly journals Origin of Intramolecular Low‐Threshold Amplified Spontaneous Emission

2021 ◽  
pp. 2001956
Author(s):  
Qi Wei ◽  
Ruihong Duan ◽  
Qi Zhang ◽  
Linghai Xie ◽  
Ruidong Xia ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Low Threshold
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