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      Low-threshold optical gain and lasing of colloidal nanoplatelets

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      Author
      Keleştemur, Yusuf
      Güzeltürk, Burak
      Olutaş, Murat
      Delikanlı, Savaş
      Demir, Hilmi Volkan
      Date
      2014-10
      Source Title
      IEEE Photonics Conference, IPC 2014
      Publisher
      IEEE
      Pages
      540 - 541
      Language
      English
      Type
      Conference Paper
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      Abstract
      Semiconductor nanocrystals, which are also known as colloidal quantum dots (CQDs), are highly attractive materials for high performance optoelectronic device applications such as lasers. With their size, shape and composition tunable electronic structure and optical properties, CQDs are highly desired for achieving full-color, temperature-insensitive, low-threshold and solution-processed lasers [1, 2]. However, due to their small size, they suffer from the nonradiative multiexciton Auger Recombination (AR), where energy of a bound electron-hole pair is transferred to a third particle of either an electron or a hole instead of radiative recombination. Therefore, CQDs having suppressed AR are strongly required for achieving high quality CQD-based lasers. To address this issue, CQDs having different size, shape and electronic structure have been synthesized and studied extensively [3-5]. Generally, suppression of AR and lower optical gain thresholds are achieved via reducing the wavefunction overlap of the electron and hole in a CQD. However, the separation of the electron and hole wavefunctions will dramatically decrease the oscillator strength and optical gain coefficient, which is highly critical for achieving high performance lasers. Therefore, colloidal materials with suppressed AR and high gain coefficients are highly welcomed. Here, we study optical gain performance of colloidal quantum wells [6] of CdSe-core and CdSe/CdS core/crown nanoplatelets (NPLs) that demonstrate remarkable optical properties with ultra-low threshold one- and two-photon optical pumping. As a result of their giant oscillator strength, superior optical gain and lasing performance are achieved from these colloidal NPLs with greatly enhanced gain coefficient [7]. © 2014 IEEE.
      Keywords
      Electronic structure
      Electrons
      Nanocrystals
      Optical properties
      Optical pumping
      Optoelectronic devices
      Photonics
      Quantum dot lasers
      Quantum well lasers
      Semiconductor lasers
      Semiconductor quantum dots
      Semiconductor quantum wells
      Colloidal quantum wells
      Electronic structure and optical properties
      Giant oscillator strength
      High gain coefficients
      High performance lasers
      Radiative recombination
      Semiconductor nanocrystals
      Temperature-insensitive
      Optical gain
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      http://hdl.handle.net/11693/27869
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/IPCon.2014.6995489
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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