Flexible Blade‐Coated Multicolor Polymer Light‐Emitting Diodes for Optoelectronic Sensors

Han, Dongil; Khan, Yasser; Ting, Jonathan; King, Simon; Yaacobi‐Gross, Nir; Humphries, Martin J.; Newsome, C. J.; Arias, Ana Claudia

doi:10.1002/adma.201606206

Cited by 98 publications

(116 citation statements)

References 25 publications

Supporting

Mentioning

108

Contrasting

Unclassified

Order By: Relevance

“…[16,39] The absence of film formation on low surface tension substrates has also been shown when coating at faster speeds, [19,[31][32][33] in the Landau-Levich regime. Solventsurface treatment combinations with higher contact angles lead to unsuccessful coatings, as solvent evaporation at the tip of the meniscus is suppressed, compromising solute supersaturation and precipitation.…”

Section: Wwwadvmatinterfacesdementioning

confidence: 89%

Influence of the Surface Treatment on the Solution Coating of Single‐Crystalline Organic Thin‐Films

Janneck

Heremans

Genoe

et al. 2018

Adv Materials Inter

View full text Add to dashboard Cite

and others [10,22,23] show high potential to achieve next generation high performance thin films. These techniques rely on the creation of a moving meniscus front, where enhanced evaporation at the tip of the meniscus leads to the precipitation of the organic solute onto the advancing single-crystalline thin film. As it defines meniscus shape, the wetting behavior of the solution on the substrate strongly impacts film formation.Typically, self-assembled monolayers are used to modify the surface energy of substrates [24] as well as to reduce their surface defect density [25,26] and control the carrier density. Several studies show that for evaporated thin films of organic semiconductors, self-assembled monolayer treatments affect both film morphology and electrical characteristics. [27][28][29] Generally, treatments with low surface energy are preferred for evaporation of organic thin films as they typically lead to larger grain sizes and good passivation of the dielectric surface. [27,29] For meniscus-guided coating

show abstract

Section: Wwwadvmatinterfacesdementioning

confidence: 89%

Influence of the Surface Treatment on the Solution Coating of Single‐Crystalline Organic Thin‐Films

Janneck

Heremans

Genoe

et al. 2018

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…The ultrathin ECG sensor device provided stable operation in repeated bending/fatigue tests and was successfully attached to the body, which substantiated its potential to monitor ECG as a wearable biomedical device. Han et al simultaneously fabricated multicolor OLEDs via surface energy patterning (SEP) technology using a solution‐based polymer light‐emitting material . The authors demonstrated s‐pulse oximetry sensors using light reflected from the fingertip by s‐photoplethysmogram (PPG), using red and green PLEDs and silicon photodiodes, formed by blade coating, as light emitters and light detectors, respectively.…”

Section: Advanced Strategies For Wearable Smart Sensing Systems Basedmentioning

confidence: 99%

“…d) Photograph of the optoelectronic sensor that uses green and red PLEDs as the light source and a silicon PD as the light detector (the sensor is placed on top of the wrist for collecting the PPG signal). c,d) Reproduced with permission . Copyright 2017, Wiley‐VCH.…”

Section: Advanced Strategies For Wearable Smart Sensing Systems Basedmentioning

confidence: 99%

Smart Sensing Systems Using Wearable Optoelectronics

Hwang

et al. 2020

Advanced Intelligent Systems

View full text Add to dashboard Cite

A wearable smart sensing system is capable of continuously monitoring biometric information such as respiration, pulse, and body temperature while attached to an arbitrary surface on the user's body to be utilized freely during activities. Research conducted on new materials, fabrication processes, structure of electrodes, and wireless communication technologies has made constant progress in the development of smart sensing systems that use entirely wearable forms of devices to go beyond conventional devices that are based on intrinsically rigid components, such as silicon. Among various platforms that can be used in the development of smart sensing systems, optoelectronics provides innovative sensing functions (e.g., human–machine interfaces and phototherapy) that can be transferred from traditional healthcare to smart healthcare, such as point of care. Optoelectronics are light‐mediated displays that allow a light source to be controlled and a large light spectrum to be detected. Recently, this platform that uses smart and wearable optoelectronic sensing systems has become increasingly advanced to better help human beings treat their diseases through self‐healthcare. Herein, recent advanced technologies in materials, structures, and wireless platforms for smart sensors using wearable optoelectronics are reviewed.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Flexible Blade‐Coated Multicolor Polymer Light‐Emitting Diodes for Optoelectronic Sensors

Cited by 98 publications

References 25 publications

Influence of the Surface Treatment on the Solution Coating of Single‐Crystalline Organic Thin‐Films

Influence of the Surface Treatment on the Solution Coating of Single‐Crystalline Organic Thin‐Films

Smart Sensing Systems Using Wearable Optoelectronics

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

Contact Info

Product

Resources

About