Observation of optical gain from aqueous quantum well heterostructures in water

Delikanlı, Savas; Işık, Furkan; Durmuşoğlu, Emek Göksu; Erdem, Onur; Shabani, Farzan; Canımkurbey, Betül; Kumar, Satish; Baruj, Hamed Dehghanpour; Demir, Hilmi Volkan

doi:10.1039/d2nr03659b

Cited by 4 publications

(3 citation statements)

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“…As a result, the band-edge gain can reach very large values exceeding 6000 cm –1 (Figure a) . Very large gain coefficients in NPL materials have been observed in multiple studies utilizing both VSL experiments ,,,, and TA measurements. ,,,,, In addition to the high NPL excitonic occupancies needed for gain saturation, large optical gain coefficients result from extremely high packing densities achievable with the NPLs (Figure b) …”

Section: Novel Nanocrystal-based Optical Gain Materialsmentioning

confidence: 92%

“…157 Very large gain coefficients in NPL materials have been observed in multiple studies utilizing both VSL experiments 146,149,150,156,187 and TA measurements. 107,152,154,155,160,189 In addition to the high NPL excitonic occupancies needed for gain saturation, large optical gain coefficients result from extremely high packing densities achievable with the NPLs (Figure 23b). 153 As was suggested in refs 154 and 190, in addition to excitonic states, NPLs may support stable Coulombically bound biexcitons or excitonic molecules.…”

Section: Optical Gain Mechanismsmentioning

confidence: 99%

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Colloidal Semiconductor Nanocrystal Lasers and Laser Diodes

et al. 2023

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Lasers and optical amplifiers based on solution-processable materials have been long-desired devices for their compatibility with virtually any substrate, scalability, and ease of integration with on-chip photonics and electronics. These devices have been pursued across a wide range of materials including polymers, small molecules, perovskites, and chemically prepared colloidal semiconductor nanocrystals, also commonly referred to as colloidal quantum dots. The latter materials are especially attractive for implementing optical-gain media as in addition to being compatible with inexpensive and easily scalable chemical techniques, they offer multiple advantages derived from a zero-dimensional character of their electronic states. These include a size-tunable emission wavelength, low optical gain thresholds, and weak sensitivity of lasing characteristics to variations in temperature. Here we review the status of colloidal nanocrystal lasing devices, most recent advances in this field, outstanding challenges, and the ongoing progress toward technological viable devices including colloidal quantum dot laser diodes.

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Section: Novel Nanocrystal-based Optical Gain Materialsmentioning

confidence: 92%

Section: Optical Gain Mechanismsmentioning

confidence: 99%

Colloidal Semiconductor Nanocrystal Lasers and Laser Diodes

et al. 2023

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“…In this quest for new heterostructures that can exhibit two-color [10][11][12] emission, maintaining confinement is an important step. In this sense, 2D nanoplatelets (NPLs) offer several advantages: (i) their specific growth mechanism 13,14 enables particularly narrow emissions, (ii) their anisotropic shape enables combining both strong confinement within the thickness while presenting a large lateral extension, (iii) their specific colloidal growth allows the design of complex heterostructures involving multiple interfaces [15][16][17][18][19] (iv) the several post-synthetic doping techniques leading toward dopant 20 or trap emissions. [21][22][23][24][25] Thus, NPLs expand the possibilities for emission quantum engineering.…”

Section: Introductionmentioning

confidence: 99%

Expanding the color palette of bicolor-emitting nanocrystals

Dabard,

Po,

et al. 2023

Nanoscale

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“Giant” Colloidal Quantum Well Heterostructures of CdSe@CdS Core@Shell Nanoplatelets from 9.5 to 17.5 Monolayers in Thickness Enabling Ultra‐High Gain Lasing

Isik,

Delikanli,

Durmusoglu

et al. 2024

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Semiconductor colloidal quantum wells (CQWs) have emerged as a promising class of gain materials to be used in colloidal lasers. Although low gain thresholds are achieved, the required high gain coefficient levels are barely met for the applications of electrically‐driven lasers which entails a very thin gain matrix to avoid charge injection limitations. Here, “giant” CdSe@CdS colloidal quantum well heterostructures of 9.5 to 17.5 monolayers (ML) in total with corresponding vertical thickness from 3.0 to 5.8 nm that enable record optical gain is shown. These CQWs achieve ultra‐high material gain coefficients up to ≈140 000 cm−1, obtained by systematic variable stripe length (VSL) measurements and independently validated by transient absorption (TA) measurements, owing to their high number of states. This exceptional gain capacity is an order of magnitude higher than the best levels reported for the colloidal quantum dots. From the dispersion of these quantum wells, low threshold amplified spontaneous emission in water providing an excellent platform for optofluidic lasers is demonstrated. Also, employing these giant quantum wells, whispering gallery mode (WGM) lasing with an ultra‐low threshold of 8 µJ cm−2 is demonstrated. These findings indicate that giant CQWs offer an exceptional platform for colloidal thin‐film lasers and in‐solution lasing applications.

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Observation of optical gain from aqueous quantum well heterostructures in water

Abstract: Although achieving optical gain using aqueous solutions of colloidal nanocrystals as a gain medium is exceptionally beneficial for bio-optoelectronic applications, the realization of optical gain in an aqueous medium using...

Cited by 4 publications

References 40 publications

Colloidal Semiconductor Nanocrystal Lasers and Laser Diodes

Colloidal Semiconductor Nanocrystal Lasers and Laser Diodes

Expanding the color palette of bicolor-emitting nanocrystals

“Giant” Colloidal Quantum Well Heterostructures of CdSe@CdS Core@Shell Nanoplatelets from 9.5 to 17.5 Monolayers in Thickness Enabling Ultra‐High Gain Lasing

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