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

Junhong Yu, Manoj Sharma, Mingjie Li, Savas Delikanli, Ashma Sharma, Muhammad Taimoor, Yemliha Altintas, James R. McBride, Thomas Kusserow, Tze Chien Sum, Hilmi Volkan Demir, Cuong Dang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

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−2, about 8-fold reduction from that in undoped CQWs (≈58 µJ cm−2) 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−2. Exploiting optical gain from TMDCNMs may help to further boost the performance of colloidal-based lasers.

Original languageEnglish
JournalLaser and Photonics Reviews
DOIs
Publication statusAccepted/In press - 2021
Externally publishedYes

Keywords

  • amplified spontaneous emission
  • colloidal quantum wells
  • copper doping
  • lasing
  • vertical cavity surface-emitting lasers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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