We present a novel composite strategy to enhance the stability of water-sensitive CsPbBr3 quantum dots (QDs) by embedding the QDs into the super-hydrophobic porous organic polymer frameworks (CPB@S...

Super-Hydrophobic Cesium Lead Halide Perovskite Quantum Dot-Polymer Composites with High Stability and Luminescent Efficiency for Wide Color Gamut White Light-Emitting Diodes

Recent advances of wearable and flexible piezoresistivity pressure sensor devices and its future prospects

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Advances in alternating current electroluminescent devices

For blue quantum dot (QD) light-emitting diodes (QLEDs), the imbalance of charges transport and injection severely affects their efficiency and lifetime. A better charge balance can be realized by ...

Achieving Balanced Charge Injection of Blue Quantum Dot Light-Emitting Diodes through Transport Layer Doping Strategies.

Light fidelity (LiFi), which is emerging as a compelling technology paradigm shifting the common means of high-capacity wireless communication technologies, requires wearable and full-duplex compact design because of its great significance in smart wearables as well as the 'Internet of Things'. However, the construction of the key component of wearable full-duplex LiFi, light-emitting/detecting bifunctional fibres, is still challenging because of the conflicting process between carrier separation and recombination, as well as the highly dynamic film-forming process. Here, we demonstrate light-emitting/detecting bifunctional fibres enabled by perovskite QDs with hybrid components. The hybrid perovskite inks endow fibres with super-smooth QD films. This, combined with the small exciton binding energy and high carrier mobility of perovskite QDs, enables successful integration of electroluminescence and photodetection into monofilaments. The bifunctional fibres possess the narrowest electroluminescence full width at half maximum of ~19 nm and, more importantly, the capability for simultaneously transmitting and receiving information. The successful fabrication of narrow emission full-duplex LiFi fibres paves the way for the fabrication and integration of low crosstalk interoperable smart wearables.

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Perovskite light-emitting/detecting bifunctional fibres for wearable LiFi communication

Fabrication of a high quality quantum dot (QD) film is essentially important for a high-performance QD light emitting diode display (QLED) device. It is normally a high-cost and multiple-step solution-transfer process where large amounts of QDs were needed but with only limited usefulness. Thus, developing a simple, efficient, and low-cost approach to fabricate high-quality micropatterned QD film is urgently needed. Here, we proposed that the Chinese brush enables the controllable transfer of a QD solution directly onto a homogeneous and ultrasmooth micropatterned film in one step. It is proposed that the dynamic balance of QDs was enabled during the entire solution transfer process under the cooperative effect of Marangoni flow aroused by the asymmetric solvent evaporation and the Laplace pressure different by conical fibers. By this approach, QD nanoparticles were homogeneously transferred onto the desired area on the substrate. The as-prepared QLED devices show rather high performances with the current...

Ultrasmooth Quantum Dot Micropatterns by a Facile Controllable Liquid-Transfer Approach: Low-Cost Fabrication of High-Performance QLED.

One-dimensional nanomaterials, including both nanowires (NWs) and nanotubes (NTs), have been extensively investigated in the decades because of their unique physicochemical properties. Particularly...

Aligning One-Dimensional Nanomaterials by Solution Processes.

Solution processing is widely used for preparing quantum dot (QD) films for fabricating QD light-emitting diode display (QLED) devices. However, current approaches suffer from either the coffee-ring effect or a large amount of wasted solution, leading to low performance and high cost. Here, a facile approach guided by a fibrous liquid bridge is developed for the continuous and controllable transfer of QD solution into ultrasmooth films by using a taut fiber with its two ends placed into capillary tubes. Guided along the fiber, a liquid bridge is formed between the horizontal fiber and the substrate, with a large mass of liquid steadily being held within the vertically placed tubes. Directionally moving the liquid bridge generates a high-quality QD film on the substrate. Particularly, the liquid consumption is quantitative, namely, in proportion to the area of the as-prepared film. Moreover, multilayered ultrasmooth red/green/blue QD films are prepared by multiple transfers of liquid onto the same targeted area in sequence. The as-prepared white QLEDs show a rather high performance with a maximum luminance of 57 190 cd m-2 and a maximum current efficiency of 15.868 cd A-1 . It is envisioned that this strategy offers new perspectives for the low-cost fabrication of high-performance QLED devices.

Continuous and Controllable Liquid Transfer Guided by a Fibrous Liquid Bridge: Toward High-Performance QLEDs.

Flexible transparent electrodes (FTEs) made of silver nanowires (AgNWs) have been widely used in wearable and foldable electronics devices. For obtaining FTEs with both high transparency and low re...

https://www.chinesechemsoc.org/doi/pdf/10.31635/ccschem.020.202000402

Direct-Writing Large-Area Cross-Aligned Ag Nanowires Network: Toward High-Performance Transparent Quantum Dot Light-Emitting Diodes

Solution processes have been widely used in controllable patterning of zero-dimensional nanoparticles on certain substrates due to their advantages of mild conditions, low-cost fabrication and good device compatibility. Preparing high-quality micro-patterns is very important for realizing high-performance devices. However, the solution processes normally involve both the coffee ring effect and Marangoni flow caused by solvent evaporation, which make it hard for precisely patterning nanoparticles in a controllable manner, leading to nonuniform micro-patterns. Therefore, various approaches have been developed to solve the adverse effects of the coffee ring during the film-forming process. In this contribution, we have reviewed the recent progress in controllable patterning of nanoparticles using solution transfer approaches either by taking advantage of or by inhibiting the coffee ring effect, as well as the mechanism involved and the applications in various fields.

Min Zhang

Papers

Ultrasmooth Quantum Dot Micropatterns by a Facile Controllable Liquid-Transfer Approach: Low-Cost Fabrication of High-Performance QLED.

Aligning One-Dimensional Nanomaterials by Solution Processes.

Continuous and Controllable Liquid Transfer Guided by a Fibrous Liquid Bridge: Toward High-Performance QLEDs.

Direct-Writing Large-Area Cross-Aligned Ag Nanowires Network: Toward High-Performance Transparent Quantum Dot Light-Emitting Diodes

Controllable patterning of nanoparticles via solution transfer processes