Prospects and challenges of colloidal quantum dot laser diodes

Jung, Heeyoung; Ahn, Namyoung; Klimov, Victor I.

doi:10.1038/s41566-021-00827-6

Cited by 92 publications

(117 citation statements)

References 131 publications

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“…As discussed above, for electrically pumped QD lasers, it is essential to achieve an optical gain in ultra-thin films in order to facilitate charge injection into the active medium for achieving population inversion; [21,22] as thin active media results in a balanced carrier supply to the QDs. [16] Furthermore, as shown in Figure 2c, by increasing the thickness of the PbS/ZnO films, the ASE peak is gradually blue-shifted.…”

Section: Resultsmentioning

confidence: 99%

“…[ 20 ] In order to eventually realize electrically‐driven infrared stimulated emission and lasing in QDs, the following challenges should be addressed: 1) to demonstrate optical gain in a full‐light‐emitting diode (LED) device stack, including conductive layers and contacts, 2) to obtain net gain and stimulated emission in ultra‐thin film gain medium in order to facilitate efficient electrical injection, and 3) to increase the robustness of the device upon high current density needed to achieve population inversion. [ 21,22 ]…”

Section: Introductionmentioning

confidence: 99%

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Ultra‐Thin Infrared Optical Gain Medium and Optically‐Pumped Stimulated Emission in PbS Colloidal Quantum Dot LEDs

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Dalmases

et al. 2022

Adv Funct Materials

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Colloidal semiconductor quantum dots (QDs) can be considered a promising material platform for solution-processed laser diodes. However, due to some fundamental challenges, the realization of electrically pumped lasing based on QDs remains unresolved. Here, a binary blend of QDs and ZnO nanocrystals is employed, which serve as nano-sized scatterers to facilitate waveguide gain in ultra-thin films. By carefully engineering the electric field in these films, an infrared amplified spontaneous emission in a record thin colloidal gain medium is observed, with a thickness of 16 nm, at a wavelength of 1675 nm. Employing these binary blends as a gain medium, an optically pumped infrared stimulated emission in a full-stacked light-emitting diode (LED) device is demonstrated. The functional LED device, which comprises a single layer of graphene as an anode electrode, shows strong electroluminescence under electrical injection. This study suggests a promising device for realizing infrared QD-based laser diodes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultra‐Thin Infrared Optical Gain Medium and Optically‐Pumped Stimulated Emission in PbS Colloidal Quantum Dot LEDs

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Tanrıöver

Dalmases

et al. 2022

Adv Funct Materials

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“…[8] However, lattice mismatch and incompatible growth temperature restrict direct integration of III-V semiconductor microlasers onto silicon photonic chips. [9] Besides these inorganic materials, solution-processable materials, such as colloidal quantum dots (CQDs), [10,11] organic semiconductors, [12] and metal-halide perovskites, [13] are promising candidates for monolithic integration of microlasers and other components into photonic circuits. In particular, CQDs exhibit quantum-confined excitonic emission with tunable luminescence energy, narrow linewidth, and high quantum efficiency inherited from their inorganic cores, while organic surface ligands permit solution processability.…”

Section: Introductionmentioning

confidence: 99%

Deterministic Assembly of Colloidal Quantum Dots for Multifunctional Integrated Photonics

et al. 2022

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on the longitudinal distance between the highest and lowest pixel of liquid bridge. The receding velocities were calculated by dL/dt (t is time of two frames of the video). All of the numercial value of rate were collected for statistics. For statistics of gap width in waveguide-microring coupled structures at various temperature, the sample size was at least 30. The images of gap width were collected exploiting SEM, while the numercial value of width were extracted from the SEM images.

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“…Colloidal QDs are typically made up of semiconductors of groups II-VI, III-V, or IV, and their incredibly small size enables them to have distinct optical and electrical properties that differ from their bulk counterparts. They have been applied to optoelectronic devices 20,21 due to their solution processability and easy fabrication process. Colloidal QDs can be classified as core-type, core-shell, and alloyed QDs, depending on their structure and composition.…”

Section: Introductionmentioning

confidence: 99%