Low-threshold optical gain and lasing of colloidal nanoplatelets
Author
Keleştemur, Yusuf
Güzeltürk, Burak
Olutaş, Murat
Delikanlı, Savaş
Demir, Hilmi Volkan
Date
2014-10Source Title
IEEE Photonics Conference, IPC 2014
Publisher
IEEE
Pages
540 - 541
Language
English
Type
Conference PaperItem Usage Stats
167
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139
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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 structureElectrons
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
Permalink
http://hdl.handle.net/11693/27869Published Version (Please cite this version)
http://dx.doi.org/10.1109/IPCon.2014.6995489Collections
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