Midinfrared electroluminescence from PbTe/CdTe quantum dot light-emitting diodes

Hochreiner, A.; Schwarzl, T.; Eibelhuber, Martin; Heiß, Wolfgang; Springholz, G.; Kolkovsky, Vl.; Karczewski, G.; Wójtowicz, T.

doi:10.1063/1.3531760

Cited by 40 publications

(25 citation statements)

References 24 publications

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“…For the formation of thin-film solids of PbTe/CdTeQ Ds, the main objective is to remove the organic ligandsa nd to sinter the CdTes hells, yielding af ully inorganic QD solid, in analogy to epitaxially grownP bTe/CdTen ano-heterostructures. [13] The necessity for removal of the organic cappingl igandsh as already been discussed in previous studies, thus showing the ability of organic molecules to quencht he mid-IR emission of PbSe NCs through the energy transfer of mid-IR electronic excitation to the vibrations of the organic ligands. [20] PbTe/CdTe QDs dispersedi nt etrachloroethane (TCE, 50 mg mL À1 )w ere spin-coated onto ag lass substrate (step 1, Figure 4a), followed by drying on ah ot plate (step 2).…”

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confidence: 94%

“…[3a, 12] In striking contrast, however,b right and stable PL, lasing, and electroluminescence at mid-IR wavelengths of 2-3.5 mmh ave been reported for PbTeQ Ds that were produced by annealing PbTe/CdTeq uantum-wells tructures grown by using molecular beam epitaxy. [13] Efficient PL arises from type-I band alignment (i.e. substantial confinement of both electrons and holes) between the rock-salt PbTea nd zinc-blende CdTe structures ( Figure 1a).…”

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confidence: 99%

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Air‐Stable, Near‐ to Mid‐Infrared Emitting Solids of PbTe/CdTe Core–Shell Colloidal quantum dots

et al. 2016

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Light emitters and detectors operating in the near- and mid-infrared spectral regions are important to many applications, such as telecommunications, high-resolution gas analysis, atmospheric pollution monitoring, medical diagnostics, and night vision. Various lead chalcogenides (binary, ternary, and quaternary alloys) in the form of quantum dots (QDs) or quantum wells provide narrow bandgap energies that cover the broad infrared region corresponding to wavelengths of 1-30 μm. Here, we report an inexpensive, all-solution-based synthesis strategy to thin-film solids consisting of 5-16 nm PbTe QDs encapsulated by CdTe shells. Colloidally synthesized PbTe QDs were first converted into core-shell PbTe/CdTe QDs, and then deposited as thin films. The subsequent fusion of the CdTe shells is achieved by ligand removal and annealing in the presence of CdCl2 . Contrary to highly unstable bare PbTe QDs, PbTe/CdTe QD solids exhibit bright and stable near- to mid-infrared emission at wavelengths of 1-3 μm, which is also retained upon prolonged storage at ambient conditions for one year.

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confidence: 94%

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confidence: 99%

Air‐Stable, Near‐ to Mid‐Infrared Emitting Solids of PbTe/CdTe Core–Shell Colloidal quantum dots

et al. 2016

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“…Such devices combine the electrical and mechanical stability of conducting oxides/ semiconducting nanoparticles and the processing flexibility of conjugated LEPs. Nanoparticles such as cadmium telluride [5][6][7], cadmium selenide [8][9], cadmium sulphide [10][11][12] also pose as an active medium in light emitting diodes categorized under Quantum dot light emitting diodes.…”

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confidence: 99%

Study on cadmium sulphide nanoparticles on blue and green light emitting polymers

et al. 2015

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We demonstrate the working of organic-inorganic hybrid light emitting diodes using cadmium sulphide nanoparticles doped in light emitting polymers. Cadmium sulphide nanoparticles were prepared by precipitation technique and doped in active light emitting polymers. We used blue emitting polymer PFO and green emitting polymer F8BT as active polymers. The j-L-V curves of nanoparticles based devices were compared with polymer only standard devices. Our results show enhanced performance such as increased conductivity and higher luminance, when nanoparticle are incorporated into the device.

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“…40,41 An essential part of the proposed structure in Ref. 41 is electron tunneling between QW and QD states.…”

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confidence: 99%

Microscopic model for intersubband gain from electrically pumped quantum-dot structures

2014

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We study theoretically the performance of electrically pumped self-organized quantum dots as a gain material in the mid-IR range at room temperature. We analyze an AlGaAs/InGaAs based structure composed of dots-in-a-well sandwiched between two quantum wells. We numerically analyze a comprehensive model by combining a many-particle approach for electronic dynamics with a realistic modeling of the electronic states in the whole structure. We investigate the gain both for quasi-equilibrium conditions and current injection. Comparing different structures we find that steady-state gain can only be realized by an efficient extraction process, which prevents an accumulation of electrons in continuum states, that make the available scattering pathways through the quantum dot active region too fast to sustain inversion. The tradeoff between different extraction/injection pathways is discussed. Comparing the modal gain to a standard quantum-well structure as used in quantum cascade lasers, our calculations predict reduced threshold current densities of the quantum dot structure for comparable modal gain. Such a comparable modal gain can, however, only be achieved for an inhomogeneous broadening of a quantum-dot ensemble that is close to the lower limit achievable today using self-organized growth.

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Midinfrared electroluminescence from PbTe/CdTe quantum dot light-emitting diodes

Cited by 40 publications

References 24 publications

Air‐Stable, Near‐ to Mid‐Infrared Emitting Solids of PbTe/CdTe Core–Shell Colloidal quantum dots

Air‐Stable, Near‐ to Mid‐Infrared Emitting Solids of PbTe/CdTe Core–Shell Colloidal quantum dots

Study on cadmium sulphide nanoparticles on blue and green light emitting polymers

Microscopic model for intersubband gain from electrically pumped quantum-dot structures

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