Dr. Victor I. Klimov Profile

Dr. Victor I. Klimov

LANL Fellow at Los Alamos National Lab

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 1 October 2023 Presentation

Colloidal quantum dot laser diodes

Victor Klimov

Proceedings Volume PC12659, PC126590C (2023) https://doi.org/10.1117/12.2680375

KEYWORDS: Semiconductor lasers, Colloidal quantum dots, Quantum photonics, Quantum devices, Electroluminescence, Waveguides, Thermal stability, Spontaneous emission, Solids, Quantum advantages

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Proceedings Article | 17 March 2023 Presentation

Continuously graded CdSe quantum dots: Tomorrow’s bright single photon emitters

Christopher Marble, Donghyo Hahm, Zachary Robinson, Vladislav Yakovlev, Victor Klimov

Proceedings Volume PC12410, PC1241008 (2023) https://doi.org/10.1117/12.2657537

KEYWORDS: Quantum dots, Single photon, Spectroscopy, Pulsed laser operation, Interferometry, System integration, Quantum efficiency, Quantum communications, Oxidation, Optical testing

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Proceedings Article | 9 March 2022 Presentation

Dual-functional colloidal quantum dot light-emitting diodes as a device platform for realizing solution-processable laser diodes

Jeongkyun Roh, Young-Shin Park, Jaehoon Lim, Victor Klimov

Proceedings Volume PC12024, PC1202403 (2022) https://doi.org/10.1117/12.2609661

KEYWORDS: Semiconductor lasers, Light emitting diodes, Quantum dots, Quantum efficiency, Optoelectronics, Optical resonators, Optical pumping, Optical properties, Luminescence, Laser optics

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Proceedings Article | 7 June 2017 Open Access

Carrier multiplication and charge transport in artificial quantum-dot solids probed by ultrafast photocurrent spectroscopy (Conference Presentation)

Victor Klimov

Proceedings Volume 10193, 1019309 (2017) https://doi.org/10.1117/12.2261720

KEYWORDS: Quantum dots, Solids, Spectroscopes, Curium, Ultrafast laser spectroscopy, Electrons, Excitons, Electronic components, Optoelectronic devices, Lead

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Proceedings Article | 5 October 2015 Presentation

Auger-decay engineering in quantum dots in relation to applications in LEDs and lasers (Presentation Recording)

Victor Klimov

Proceedings Volume 9546, 954612 (2015) https://doi.org/10.1117/12.2190074

KEYWORDS: Light emitting diodes, Interfaces, Quantum dots, Laser applications, Picosecond phenomena, Luminescence, Quenching (fluorescence), Semiconductor lasers, Laser development, Nanostructures

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Proceedings Article | 29 May 2013 Paper

Probing the gamma-scintillation process in semiconductor nanomaterials using ultrafast transient cathodoluminescence

Jeffrey Pietryga, Lazaro Padilha, Wan Ki Bae, Victor Klimov, Richard Schaller

Proceedings Volume 8710, 87101G (2013) https://doi.org/10.1117/12.2015495

KEYWORDS: Scintillators, Electrons, Sensors, Composites, Gamma radiation, Polymers, Semiconductors, Autoregressive models, Picosecond phenomena, Nanomaterials

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Proceedings Article | 27 September 2012 Paper

Wavefunction engineering in core-shell semiconductor nanocrystals: from fine-tuned exciton dynamics and suppressed Auger recombination to dual color electroluminescence

Sergio Brovelli, Florencio García-Santamaría, Ranjani Viswanatha, Bhola Pal, Scott Crooker, Victor Klimov

Proceedings Volume 8459, 84590L (2012) https://doi.org/10.1117/12.959441

KEYWORDS: Cadmium sulfide, Excitons, Light emitting diodes, Solar energy, Solids, Nanocrystals, Interfaces, Electroluminescence, Semiconductors, Phonons

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Using semiconductor nanocrystals (NCs) one can produce extremely strong spatial confinement of electronic wave functions not accessible with other types of nanostructures. As a result, NCs exhibit important physical properties which, in combination with the chemical stability and solution processability, make this class of functional materials particularly appealing for several technological fields, such as solid-state lighting, lasers, photovoltaics, and electronics. Generally, the tunability of their physical properties is achieved through particle-size control of the quantum confinement effect. Wavefunction engineering adds a degree of freedom for manipulating the physical properties of NCs by selectively confining the carriers in specific domains of the material, thereby controlling the spatial overlap between the electron and hole wavefunctions. This design has been applied to several material systems in different geometries and has been shown to successfully control the emission energy and recombination dynamics as well as to reduce nonradiative Auger recombination, a process in which, as a consequence of strong spatial confinement, the energy of one electron-hole pair is nonradiatively transferred to a third charge carrier. The focus of this presentation is on nanocrystal heterostructures that comprise a small CdSe core overcoated with a thick shell of wider-gap CdS. These quasi-type II structures show greatly suppressed Auger recombination, which allows us to realize broadband optical gain (extends over 500 meV)1, and are a remarkable class of model compounds for investigating the influence of nanoengineered electron-hole overlap on the exciton fine structure.2 We indeed recently showed that this quasi-type II motif can be used to tune the energy splitting between optically active (“bright”) and optically passive (“dark”) excitons due to strong electron-hole exchange interaction, which is typical of quantum-confined semiconductor nanocrystals. This design provides a new tool for controlling excitonic dynamics including absolute recombination time scales and temperature and magnetic field dependences separately from the confinement energy.

As a result of reduced Auger recombination, in combination with essentially complete suppression of energy-transfer in thick-shell NCs films, we recently fabricated bright, monochrome LEDs based on these nanostructures. Our results indicate that the luminance and efficiency can be improved dramatically by increasing the shell thickness without detrimental effects of increased turn-on voltage.3 Detailed structural and spectroscopic studies reveal a crucial role of interfaces on the Auger recombination process ion these heterostructures. Specifically, we observe a sharp transition to Auger-recombination-free behavior for shell thickness ~1.8-2.5 nm, accompanied by the development of an intense phonon mode characteristic of a CdSeS alloy.4 These results suggest that the likely reason for suppressed Auger recombination in these nanostructures is the “smoothing out” of the otherwise sharp confinement potential due to formation of a graded interfacial CdSeS layer between the CdSe core and the CdS shell, as was recently proposed by theoretical calculations by Cragg and Efros.5

Proceedings Article | 3 March 2009 Paper

Giant multishell CdSe nanocrystal quantum dots with suppressed blinking: novel fluorescent probes for real-time detection of single-molecule events

Jennifer Hollingsworth, Javier Vela, Yongfen Chen, Han Htoon, Victor Klimov, Amy Casson

Proceedings Volume 7189, 718904 (2009) https://doi.org/10.1117/12.809678

KEYWORDS: Nanocrystals, Quantum dots, Zinc, Optical properties, Temporal resolution, Cadmium sulfide, Natural surfaces, Chemistry, Luminescence, Quantum efficiency

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Proceedings Article | 26 August 2008 Paper

Nanoplasmonic renormalization and enhancement of Coulomb interactions

Maxim Durach, Anastasia Rusina, Victor Klimov, Mark Stockman

Proceedings Volume 7032, 70320J (2008) https://doi.org/10.1117/12.796886

KEYWORDS: Surface plasmons, Metals, Fluorescence resonance energy transfer, Nanoplasmonics, Plasmonics, Energy transfer, Dielectrics, Scattering, Quantum dots, Nanostructuring

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Proceedings Article | 4 October 2005 Paper

Nanocomposite solar cells based on conjugated polymers and PbSe quantum dots

Xiaomei Jiang, Sergey Lee, Igor Altfeder, Anvar Zakhidov, Richard Schaller, Jeff Pietryga, Victor Klimov

Proceedings Volume 5938, 59381F (2005) https://doi.org/10.1117/12.619361

KEYWORDS: Polymers, Infrared radiation, Solar cells, Quantum dots, Absorption, Nanocomposites, Infrared photography, Luminescence, Photovoltaics, Nanocrystals

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Proceedings Article | 17 December 1999 Paper

Universal ultrafast signatures of photoexcitations in conjugated polymers: excitons and charge-transfer polarons

Duncan McBranch, Brett Kraabel, Su Xu, Hsing-Lin Wang, Victor Klimov

Proceedings Volume 3797, (1999) https://doi.org/10.1117/12.372706

KEYWORDS: Photoacoustic tomography, Excitons, Polarons, Polymers, Excimers, Absorption, Picosecond phenomena, Solids, Ultrafast phenomena, Thin films

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Proceedings Article | 4 October 1999 Paper

Development of solid state optical limiting devices

Su Xu, Hsing-Lin Wang, Anton Malko, Randolph Kohlman, L. Smilowitz, Victor Klimov, Duncan McBranch, Jean-Luc Nogues, William Moreshead, David Hagan, Sidney Yang, Eric Van Stryland

Proceedings Volume 3798, (1999) https://doi.org/10.1117/12.363865

KEYWORDS: Transmittance, Optical limiting, Absorption, Solid state physics, Laser damage threshold, Solid state electronics, Signal attenuation, Picosecond phenomena, Visible radiation, Solids

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Proceedings Article | 1 December 1997 Paper

Exciton and biexciton signatures in femtosecond transient absorption of pi-conjugated oligomers

Victor Klimov, Duncan McBranch, Nikolay Barashkov, John Ferraris

Proceedings Volume 3145, (1997) https://doi.org/10.1117/12.295539

KEYWORDS: Excitons, Picosecond phenomena, Solid state physics, Molecules, Absorption, Solids, Femtosecond phenomena, Oscillators, Polymers, Semiconductors

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Proceedings Article | 1 November 1997 Paper

Ultrafast and nonlinear optical characterization of optical limiting processes in fullerenes

Randolph Kohlman, Victor Klimov, M. Grigorova, X. Shi, Benjamin Mattes, Duncan McBranch, H. Wang, Fred Wudl, Jean-Luc Nogues, William Moreshead

Proceedings Volume 3142, (1997) https://doi.org/10.1117/12.283754

KEYWORDS: Absorption, Fullerenes, Sol-gels, Picosecond phenomena, Optical limiting, Solids, Glasses, Adaptive optics, Oscillators, Ultrafast phenomena

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Proceedings Article | 16 December 1996 Paper

Femtosecond excited-state absorption dynamics and optical limiting in fullerene solutions, sol-gel glasses, and thin films

Duncan McBranch, Victor Klimov, Laura Smilowitz, M. Grigorova, Jeanne Robinson, Aaron Koskelo, Benjamin Mattes, H. Wang, Fred Wudl

Proceedings Volume 2854, (1996) https://doi.org/10.1117/12.262976

KEYWORDS: Glasses, Absorption, Thin films, Optical limiting, Fullerenes, Composites, Sol-gels, Picosecond phenomena, Solids, Solid state physics

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Proceedings Article | 27 May 1996 Paper

Optical limiting and excited-state absorption in fullerene derivatives

Laura Smilowitz, Duncan McBranch, Victor Klimov, Aaron Koskelo, Jeanne Robinson, Benjamin Mattes, Jan Hummelen, Fred Wudl

Proceedings Volume 2714, (1996) https://doi.org/10.1117/12.240399

KEYWORDS: Optical limiting, Absorption, Fullerenes, Thin films, Laser damage threshold, Solid state physics, Glasses, Absorbance, Picosecond phenomena, Composites

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Proceedings Article | 8 December 1995 Paper

Optical limiting and excited-state absorption in fullerene solutions and doped glasses

Duncan McBranch, Laura Smilowitz, Victor Klimov, Aaron Koskelo, Jeanne Robinson, Benjamin Mattes, Jan Hummelen, Fred Wudl, James Withers, Nicholas Borrelli

Proceedings Volume 2530, (1995) https://doi.org/10.1117/12.228119

KEYWORDS: Absorption, Fullerenes, Optical limiting, Solids, Picosecond phenomena, Glasses, Thin films, Visible radiation, Calibration, Near infrared

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Proceedings Article | 2 June 1994 Paper

Nonlinear optics of quantum dot and quantum wire structures

Victor Klimov, V. Dneprovskii, V. Karavanskii

Proceedings Volume 2145, (1994) https://doi.org/10.1117/12.177134

KEYWORDS: Nonlinear optics, Quantum dots

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Proceedings Article | 19 November 1993 Paper

Nonlinear optical phenomena and lasing in semiconductor quantum dots and wires

V. Dneprovskii, V. Karavanskii, Victor Klimov, D. Okorokov, Yu. Vandyshev

Proceedings Volume 1985, (1993) https://doi.org/10.1117/12.162756

KEYWORDS: Nanocrystals, Semiconductors, Quantum dots, Silicon, Cadmium sulfide, Selenium, Semiconductor lasers, Ultrafast phenomena, Picosecond phenomena, Electrons

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