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  4. Low-Threshold Lasing from Copper-Doped CdSe Colloidal Quantum Wells
 
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Low-Threshold Lasing from Copper-Doped CdSe Colloidal Quantum Wells

Publikationstyp
Journal Article
Date Issued
2021-06
Sprache
English
Author(s)
Yu, Junhong  
Sharma, Manoj  
Li, Mingjie  
Delikanli, Savas  
Sharma, Ashma  
Taimoor, Muhammad  
Altintas, Yemliha  
McBride, James R.  
Kusserow, Thomas  
Sum, Tze Chien  
Demir, Hilmi Volkan  
Dang, Cuong  
TORE-URI
http://hdl.handle.net/11420/9672
Journal
Laser & photonics reviews  
Volume
16
Issue
6
Article Number
2100034
Citation
Laser and Photonics Reviews 15 (6): 2100034 (2021-06)
Publisher DOI
10.1002/lpor.202100034
Scopus ID
2-s2.0-85105065759
Transition metal doped colloidal nanomaterials (TMDCNMs) have recently attracted attention as promising nano-emitters due to dopant-induced properties. However, despite ample investigations on the steady-state and dynamic spectroscopy of TMDCNMs, experimental understandings of their performance in stimulated emission regimes are still elusive. Here, the optical gain properties of copper-doped CdSe colloidal quantum wells (CQWs) are systemically studied with a wide range of dopant concentration for the first time. This work demonstrates that the amplified spontaneous emission (ASE) threshold in copper-doped CQWs is a competing result between the biexciton formation, which is preferred to achieve population inversion, and the hole trapping which stymies the population inversion. An optimum amount of copper dopants enables the lowest ASE threshold of ≈7 µJ cm , about 8-fold reduction from that in undoped CQWs (≈58 µJ cm ) under sub-nanosecond pulse excitation. Finally, a copper-doped CQW film embedded in a vertical cavity surface-emitting laser (VCSEL) structure yields an ultralow lasing threshold of 4.1 µJ cm . Exploiting optical gain from TMDCNMs may help to further boost the performance of colloidal-based lasers.
Subjects
amplified spontaneous emission
colloidal quantum wells
copper doping
lasing
vertical cavity surface-emitting lasers
DDC Class
000: Allgemeines, Wissenschaft
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