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      Ultralow threshold one-photon-and two-photon-pumped optical gain media of blue-emitting colloidal quantum dot films

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      Author
      Guzelturk, B.
      Kelestemur, Y.
      Akgul, M. Z.
      Sharma, V. K.
      Demir, Hilmi Volkan
      Date
      2014
      Source Title
      Journal of Physical Chemistry Letters
      Print ISSN
      1948-7185
      Publisher
      American Chemical Society
      Volume
      5
      Issue
      13
      Pages
      2214 - 2218
      Language
      English
      Type
      Article
      Item Usage Stats
      129
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      Abstract
      Colloidal quantum dots (QDs) offer advantageous properties as an optical gain media for lasers. Optical gain in the QDs has been shown in the whole visible spectrum, yet it has been intrinsically challenging to realize efficient amplified spontaneous emission (ASE) and lasing in the blue region of the visible spectrum. Here, we synthesize large-sized core/gradient shell CdZnS/ZnS QDs as an efficient optical gain media in the blue spectral range. In this Letter, we demonstrate for the first time that two-photon-absorption-pumped ASE from the blue-emitting QD is achievable with a threshold as low as 6 mJ/cm(2). Utilizing these QDs, we also report one-photon-absorption-pumped ASE at an ultralow threshold of similar to 60 mu J/cm(2), which is comparable to the state-of-the-art red-emitting QD-based gain media. This one-photon-pumped ASE threshold is an order of magnitude better than that of the previously reported best blue-emitting QD-based gain media.
      Keywords
      Amplified Spontaneous Emission
      Semiconductor Nanocrystals
      Stimulated-emission
      Highly Efficient
      Wave-guides
      Permalink
      http://hdl.handle.net/11693/13237
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/jz500726h
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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