Ultralow Threshold One-Photon- and Two-Photon-Pumped Optical Gain Media of Blue-Emitting Colloidal Quantum Dot Films

Download

index.pdf

Date

2014-07-01

Author

Guzelturk, Burak
Keleştemur, Yusuf
Akgul, Mehmet Zafer
Sharma, Vijay Kumar
Demir, Hilmi Volkan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

140
views

85
downloads

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.

URI

https://hdl.handle.net/11511/92555

Journal

JOURNAL OF PHYSICAL CHEMISTRY LETTERS

DOI

https://doi.org/10.1021/jz500726h

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

3D-graphene-laser patterned p-type silicon Schottky diode Orhan, Elif Oz; Efil, Esra; Bayram, Ozkan; Kaymak, Nuriye; Berberoğlu, Halil; Candemir, Ozun; Pavlov, Ihor; Ocak, Sema Bilge (Elsevier BV, 2021-01-01) © 2020 Elsevier LtdThe influence of the laser patterning (LP) process on the quality of graphene (Gr) film and Schottky diode characteristics was researched in this study. First of all, p-type silicon (Si) was patterned by homemade femtosecond laser source. To compare the resulting effect, non-patterned n-Si and p-Si were used as substrates. To achieve vertically oriented three-dimensional (3D) Gr nanosheets (VGNs) onto the laser patterned p-type Si, non-patterned n-Si, and p-Si substrates, we used Radio-Fr...
Amplified Spontaneous Emission and Lasing in Colloidal Nanoplatelets Guzelturk, Burak; Keleştemur, Yusuf; Olutas, Murat; Delikanli, Savas; Demir, Hilmi Volkan (2014-07-01) Colloidal nanoplatelets (NPLs) have recently emerged as favorable light-emitting materials, which also show great potential as optical gain media due to their remarkable optical properties. In this work, we systematically investigate the optical gain performance of CdSe core and CdSe/Cds core/crown NPLs having different Cds crown size with one- and two-photon absorption pumping. The core/crown NPLs exhibit enhanced gain performance as compared to the core-only NPLs due to increased absorption cross section ...
Soot and nanoparticle formation in laminar and turbulent flames Commodo, M.; Violi, S.; D'Anna, A.; D'Alessio, A.; Allouis, Christophe Gerard; Beretta, F.; Minutolo, P. (2007-01-01) A new optical diagnostic method has been developed based on the interaction of a pulsed UV laser source with combustion-generated aerosols. This method allows characterization of nanoparticles of organic carbon (NOC) and soot by point measurements. Fluorescence and incandescence measurements induced by the fifth harmonic of a Nd-YAG laser at 213 nm are used for the determination of the volume fractions of particulates in a laminar premixed flame and in a turbulent non-premixed flame of ethylene/air. The sel...
Spectroscopic ellipsometry study of Si nanocrystals embedded in a SiOx matrix: Modeling and optical characterization Ilday, Serim; Nogay, Gizem; Turan, Raşit (2014-11-01) In this work, we report on a spectroscopic ellipsometry study of thin films of silicon nanocrystals embedded in a SiOx matrix that is performed to better understand how substoichiometric SiOx species affect the optical properties of these systems. The silicon nanocrystals are fabricated in a SiOx matrix by thermal annealing of magnetron-sputtered thin films in a wide range of x values (0< x< 2) in order to produce every possible substoichiometric SiOx species in various fractions. A generic optical model to...
Highly Stable Multicrown Heterostructures of Type-II Nanoplatelets for Ultralow Threshold Optical Gain Dede, Didem; Taghipour, Nima; Quliyeva, Ulviyya; Sak, Mustafa; Keleştemur, Yusuf; Gungor, Kivanc; Demir, Hilmi Volkan (2019-03-01) Solution-processed type-II quantum wells exhibit outstanding optical properties, which make them promising candidates for light-generating applications including lasers and LEDs. However, they may suffer from poor colloidal stability under ambient conditions and show strong tendency to assemble into face-to-face stacks. In this work, to resolve the colloidal stability and uncontrolled stacking issues, we proposed and synthesized CdSe/CdSe1-xTex/CdS core/multicrown hetero-nanoplatelets (NPLs), controlling th...

Citation Formats

B. Guzelturk, Y. Keleştemur, M. Z. Akgul, V. K. Sharma, and H. V. Demir, “Ultralow Threshold One-Photon- and Two-Photon-Pumped Optical Gain Media of Blue-Emitting Colloidal Quantum Dot Films,” JOURNAL OF PHYSICAL CHEMISTRY LETTERS, vol. 5, no. 13, pp. 2214–2218, 2014, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/92555.