Low-threshold stimulated emission using colloidal quantum wells
arXiv:1312.3364 · doi:10.1021/nl500775p
Abstract
Semiconductor nanocrystals can be synthesized using inexpensive, scalable, solution-based techniques, and their utility as tunable light emitters has been demonstrated in various applications, including biolabeling and light-emitting devices. By contrast, the use of colloidal nanocrystals for optical amplification and lasing has been limited by the high input power densities that have been required. In this work, we show that colloidal nanoplatelets (NPLs) produce amplified spontaneous emission (ASE) with pump-fluence thresholds as low 6 uJ/cm2 and gain as high as 600 cm-1, both a 4-fold improvement over the best reported values for colloidal nanocrystals; in addition, gain saturation occurs at pump fluences two orders of magnitude higher than the ASE threshold. We attribute this exceptional performance to large optical cross-sections, slow Auger recombination rates, and the narrow emission linewidth of the NPL ensemble. The NPLs bring the advantages of quantum wells as an optical gain medium to a colloidal system, opening up the possibility of producing high-efficiency, solution-processed lasers.
Cited by in corpus (21)
- How semiconductor nanoplatelets form
- Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets
- On-Chip Integrated Quantum-Dot Silicon-Nitride Microdisk Lasers
- Distance Dependence of the Energy Transfer Rate From a Single Semiconductor Nanostructure to Graphene
- Colloidal manganese doped ZnS nanoplatelets and their optical properties
- p-State Luminescence in CdSe Nanoplatelets: The Role of Lateral Confinement and an LO Phonon Bottleneck
- Single-mode lasing from colloidal water-soluble CdSe/CdS quantum dot-in-rods
- Orientation-Controlled Construction of Superstructures of Atomically-Flat Nanocrystals: Pushing the Limits of Ultra-Thin Colloidal Gain Media
- Sub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shelling
- Zone-folded longnitude acoustic phonons driving self-trapped state emission in colloidal CdSe nanoplate superlattice
- Complex diffusion-based kinetics of photoluminescence in semiconductor nanoplatelets
- High-energy exciton transitions in quasi-two-dimensional cadmium chalcogenide nanoplatelets
- Exciton-Exciton Interaction and Cascade Relaxation of Excitons in Colloidal CdSe Nanoplatelets
- Photoexcitation of PbS Nanosheets Leads to Highly Mobile Charge Carriers and Stable Excitons
- Colloidal two-dimensional metal chalcogenides: Realization and application of the structural anisotropy
- Higher-order photon correlation as a tool to study exciton dynamics in quasi-2D nanoplatelets
- Core/Shell CdSe/CdS Bone-Shaped Nanocrystals with a Thick and Anisotropic Shell as Optical Emitters
- Lattice dynamics of quasi-two-dimensional CdSe nanoplatelets and their Raman and infrared spectra
- Sustained biexciton emission in colloidal quantum wells assisted by dopant-host interaction
- Spontaneous strain in quasi-two-dimensional Janus CdSe nanoplatelets and its microscopic mechanisms
- Optoelectronics of confined semiconductors : the case of colloidal nanocrystals and their application to photodetection