Quantum Dots for Display Applications

Shu, Yufei; Lin, Xing; Qin, Haiyan; Hu, Zhuang; Jin, Yizheng; Peng, Xiaogang

doi:10.1002/ange.202004857

Cited by 60 publications

(27 citation statements)

References 133 publications

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“…For instance, CdSe-based quantum dots offer otherwise-not-available color quality for liquid-crystal-display, which is rapidly becoming a mainstream technology in display industry. 31 Mostly because of high demand, synthetic chemistry of cadmium chalcogenide nanocrystals has been focused on developing strongly confined ones with nearly ideal emission properties, instead of those in the weakly confined size regime. There are some efforts on the synthesis of CdSe nanocrystals with their sizes greater than the exciton diameter.…”

Section: ■ Introductionmentioning

confidence: 99%

Synthesis of Weakly Confined, Cube-Shaped, and Monodisperse Cadmium Chalcogenide Nanocrystals with Unexpected Photophysical Properties

Liu

et al. 2022

J. Am. Chem. Soc.

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Zinc-blende CdSe, CdS, and CdSe/CdS core/shell nanocrystals with a structure-matched shape (cube-shaped, edge length ≤30 nm) are synthesized via a universal scheme. With the edge length up to five times larger than exciton diameter of the bulk semiconductors, the nanocrystals exhibit novel properties in the weakly confined size regime, such as near-unity single exciton and biexciton photoluminescence (PL) quantum yields, singlenanocrystal PL nonblinking, mixed PL decay dynamics of exciton and free carriers with sub-microsecond monoexponential decay lifetime, and stable yet extremely narrow PL full width at half maximum (FWHM < 0.1 meV) at 1.8 K. Their monodisperse edge length, shape, and facet structure enable demonstration of unexpected yet size-dependent PL properties at room temperature, including unusually broad and abnormally size-dependent PL FWHM (∼100 meV), nonmonotonic size dependence of PL peak energy, and dual-peak single-exciton PL. Calculations suggest that these unusual properties should be originated from the band-edge electron/hole states of the dynamic-exciton, whose exciton binding energy is too small to hold the photogenerated electron−hole pair as a bonded Wannier exciton in a weakly confined nanocrystal.

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Section: ■ Introductionmentioning

confidence: 99%

Synthesis of Weakly Confined, Cube-Shaped, and Monodisperse Cadmium Chalcogenide Nanocrystals with Unexpected Photophysical Properties

Liu

et al. 2022

J. Am. Chem. Soc.

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“…Undoubtedly, QD-based SEL–WQLEDs have also been valued and developed for these advantages. Moreover, compared with the multistep synthesis of organic emitters and high-precision doping in the vacuum thermal evaporation process, the low-cost synthesis and the colloidal solution feature of QDs give sufficient feasibility and advantages for SEL–WLEDs 62 – 66 . Therefore, some SEL–WQLEDs have emerged in recent years 21 – 25 .…”

Section: Cases Of Wleds With a Single Emissive Layermentioning

confidence: 99%

Research progress of full electroluminescent white light-emitting diodes based on a single emissive layer

et al. 2021

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Carbon neutrality, energy savings, and lighting costs and quality have always led to urgent demand for lighting technology innovation. White light-emitting diodes (WLEDs) based on a single emissive layer (SEL) fabricated by the solution method have been continuously researched in recent years; they are advantageous because they have a low cost and are ultrathin and flexible. Here, we reviewed the history and development of SEL–WLEDs over recent years to provide inspiration and promote their progress in lighting applications. We first introduced the emitters and analysed the advantages of these emitters in creating SEL–WLEDs and then reviewed some cases that involve the above emitters, which were formed via vacuum thermal evaporation or solution processes. Some notable developments that deserve attention are highlighted in this review due to their potential use in SEL–WLEDs, such as perovskite materials. Finally, we looked at future development trends of SEL–WLEDs and proposed potential research directions.

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“…11,12 Accompanied by the wet-chemistry flexible manipulation of the nanocrystals, this has led to numerous applications. A lead example where CQDs are already commercialized is their use in information displays, 2,3,13 showcasing the feasibility of their scalable production and their robustness. Further applications of CQDs ranging from lasers, 14 solar cells 15 and 3D printing might appear in the future.…”

Section: Introductionmentioning

confidence: 99%

Complete Mapping of Interacting Charging States in Single Coupled Colloidal Quantum Dot Molecules

et al. 2022

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Colloidal quantum dots (CQDs), major building blocks in modern optoelectronic devices, have so far been synthesized with only one emission center where the exciton resides. Recent development of coupled colloidal quantum dots molecules (CQDM), where two core–shell CQDs are fused to form two emission centers in close proximity, allows exploration of how charge carriers in one CQD affect the charge carriers in the other CQD. Cryogenic single particle spectroscopy reveals that while CQD monomers manifest a simple emission spectrum comprising a main emission peak with well-defined phonon sidebands, CQDMs exhibit a complex spectrum with multiple peaks that are not all spaced according to the known phonon frequencies. Based on complementary emission polarization and time-resolved analysis, this is assigned to fluorescence of the two coupled emission centers. Moreover, the complex peak structure shows correlated spectral diffusion indicative of the coupling between the two emission centers. Utilizing Schrödinger-Poisson self-consistent calculations, we directly map the spectral behavior, alternating between neutral and charged states of the CQDM. Spectral shifts related to electrostatic interaction between a charged emission center and the second emission center are thus fully mapped. Furthermore, effects of moving surface charges are identified, whereby the emission center proximal to the charge shows larger shifts. Instances where the two emission centers are negatively charged simultaneously are also identified. Such detailed mapping of charging states is enabled by the coupling within the CQDM and its anisotropic structure. This understanding of the coupling interactions is progress toward quantum technology and sensing applications based on CQDMs.

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Quantum Dots for Display Applications

Cited by 60 publications

References 133 publications

Synthesis of Weakly Confined, Cube-Shaped, and Monodisperse Cadmium Chalcogenide Nanocrystals with Unexpected Photophysical Properties

Synthesis of Weakly Confined, Cube-Shaped, and Monodisperse Cadmium Chalcogenide Nanocrystals with Unexpected Photophysical Properties

Research progress of full electroluminescent white light-emitting diodes based on a single emissive layer

Complete Mapping of Interacting Charging States in Single Coupled Colloidal Quantum Dot Molecules

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