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

Zhang, Min; Hu, Binbin; Meng, Lili; Bian, Ruixin; Wang, Siyuan; Wang, Yunjun; Liu, Huan; Jiang, Lei

doi:10.1021/jacs.8b02948

Cited by 91 publications

(86 citation statements)

References 56 publications

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“…Electroluminescent (EL) devices have been the research hotspots for decades because of their enormous market value in lighting sources and displays . In particular, tremendous efforts have been put into developing the cost‐effective fabrication approaches for eco‐friendly illumination units, such as organic light‐emitting diodes (OLEDs) and quantum dots based light‐emitting diodes (QLEDs) .…”

Section: Introductionmentioning

confidence: 99%

Advances in Alternating Current Electroluminescent Devices

Wang

Lian

et al. 2019

Advanced Optical Materials

116

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radiatively at the active emissive layer driven by constant-voltage or direct current (DC). However, the DC-driven mode for OLEDs and QLEDs limits their practical applications. One reason is that the unidirectional DC flow may lead to unfavorable charges accumulation at high current density. Furthermore, the power losses are unavoidable as the DC-driven devices require power converters and rectifiers when connected to the 110/220 V at 50/60 Hz alternating current (AC) power sources. OLEDs are also particularly sensitive to dimensional variations accompanied by the generation of leakage currents at such imperfections, which is unfavorable for their application in flexible electronics. Consequently, AC-driven EL devices have attracted attention as promising alternatives to DC-driven EL devices for a variety of applications. [25][26][27][28][29][30][31][32][33] AC-driven EL devices are primarily composed of electrodes, an emissive layer and a single-or multilayer of insulating dielectric without the critical requirement for energy band matching, which facilitates their application in large-scale displays and flexible devices. [34] The device structure of AC-driven EL devices can be mainly divided into three kinds: i) AC-driven thin film electroluminescent (AC-TFEL) devices; ii) AC-driven lightemitting devices (AC-LEDs), and iii) AC-driven light-emitting field effect diodes (AC-LEFETs). Under the AC electric field, light generation is based on either the hot-electron impact excitation mechanism or the exciton recombination mechanism, depending on the device configuration. Despite the different operation principles, AC-driven EL devices have shown specific Alternating current (AC)-driven electroluminescent (EL) devices have recently attracted attention as potential alternatives to direct current (DC)-driven organic light-emitting diodes (OLEDs), as they have the great advantage of easy integration into the AC power system of 110/220 V at 50/60 Hz without complicated back-end electronics. However, the high driving voltage and low power efficiency inherent to AC-driven EL devices limit their widespread application. While researchers have made some remarkable progress in this field, the underlying causes during the development process remain to be explored. The strategies for improving the performance of AC-driven EL devices with different configurations, such as the conventional sandwiched structure and multilayer-based light-emitting devices, are summarized in this review. For example, it is crucial to enhance the effective electric field around the emitters for AC-driven thin film electroluminescent (AC-TFEL) devices, while the unbalanced generation/injection of charge carriers is the main limiting factor for the performance of AC-driven light-emitting devices (AC-LEDs). The recent advances in AC-driven EL devices, with some new configurations or new-type emitting materials, are presented by category. The challenges and opportunities for the further development of AC-driven EL devices are also discussed.

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Section: Introductionmentioning

confidence: 99%

Advances in Alternating Current Electroluminescent Devices

Wang

Lian

et al. 2019

Advanced Optical Materials

116

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“…Then, the H 3 PO 4 –PVA electrolyte was applied one more time to ensure that the two electrodes are electrically connected. On the twisted structure fiber supercapacitor, triboelectric polymer poly(vinylidenefluoride‐trifluoroethylene‐chlorotrifluoroethylene) (P(VDF‐TrFE‐CTFE)) solution at a concentration of 10 wt.% was coated using the brush printing method, which resulted in a coaxial structure fiber device, namely, a spontaneous self‐charging hybrid smart fiber . It is found that the brush printing method demonstrated excellent feasibility of replacing the conventional spin‐coating method.…”

Section: Resultsmentioning

confidence: 99%

“…First, carbon fibers with the diameter of ≈7 µm were well aligned in the vertical direction and then a bundle of carbon fibers was polished using deionized water in order to make a carbon fiber electrode with the thickness of 500 µm. On the carbon fibers, a phosphoric acid (H 3 PO 4 ) electrolyte mixed with polyvinyl alcohol (PVA) was applied using a brush printing method . After 2 h of a drying process in ambient air at room temperature, two carbon electrodes with the H 3 PO 4 –PVA electrolyte were twisted together with a period of 5 turns per inch.…”

Section: Resultsmentioning

confidence: 99%

Hybrid Smart Fiber with Spontaneous Self‐Charging Mechanism for Sustainable Wearable Electronics

Cho

Pak

Lee

et al. 2020

Adv Funct Materials

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Smart wearable electronics that are fabricated on light‐weight fabrics or flexible substrates are considered to be of next‐generation and portable electronic device systems. Ideal wearable and portable applications not only require the device to be integrated into various fiber form factors, but also desire self‐powered system in such a way that the devices can be continuously supplied with power as well as simultaneously save the acquired energy for their portability and sustainability. Nevertheless, most of all self‐powered wearable electronics requiring both the generation of the electricity and storing of the harvested energy, which have been developed so far, have employed externally connected individual energy generation and storage fiber devices using external circuits. In this work, for the first time, a hybrid smart fiber that exhibits a spontaneous energy generation and storage process within a single fiber device that does not need any external electric circuit/connection is introduced. This is achieved through the employment of asymmetry coaxial structure in an electrolyte system of the supercapacitor that creates potential difference upon the creation of the triboelectric charges. This development in the self‐charging technology provides great opportunities to establish a new device platform in fiber/textile‐based electronics.

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“…To date, solution processes have been widely used for fabricating QD films because they involve mild conditions and easy operation, such as contact printing, spin coating, screen printing, roll‐to‐roll coating, blade coating, inkjet printing, and others . However, these approaches normally suffer from the limitations of either high‐cost or low film quality.…”

Section: Summary Of the Performance Of The As‐prepared Qled Devices (mentioning

confidence: 99%

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

Zhang

et al. 2019

Advanced Materials

Self Cite

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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.

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

Cited by 91 publications

References 56 publications

Advances in Alternating Current Electroluminescent Devices

Advances in Alternating Current Electroluminescent Devices

Hybrid Smart Fiber with Spontaneous Self‐Charging Mechanism for Sustainable Wearable Electronics

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

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