scholarly journals Inkjet Printing of an Electron Injection Layer: New Role of Cesium Carbonate Interlayer in Polymer OLEDs

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 80
Author(s):  
Amruth C ◽  
Beata Luszczynska ◽  
Wassima Rekab ◽  
Marek Zdzislaw Szymanski ◽  
Jacek Ulanski
Keyword(s):  
Inkjet Printing ◽  
Low Cost ◽  
Electron Injection ◽  
Potential Method ◽  
Optical Microscope ◽  
Cesium Carbonate ◽  
Light Emitting ◽  
Emission Area ◽  
Industrial Grade ◽  
Wide Range

Among solution-processable techniques, inkjet printing is a potential method for manufacturing low-cost and high-resolution polymer organic light-emitting diodes (PLEDs) for displays/solid-state lighting applications. Herein, we demonstrate use of the inkjet printed cesium carbonate (Cs2CO3) film as an electron injection interlayer. We have elaborated the Cs2CO3 ink using an alcohol-based solvent for the industrial-grade printhead. The printed Cs2CO3 layer morphology was investigated by means of an optical microscope and an atomic force microscope. The PLEDs based on emissive polymer (Super Yellow) with printed Cs2CO3 interlayer show a remarkable current efficiency and luminance compared to the PLEDs made without the Cs2CO3 layer. Such results suggest that the Cs2CO3 is a promising material for the formulation of the electron injecting inkjet inks. The possibility of inkjet printing of an efficient electron injecting layer enables in situ patterning of PLEDs’ emission area. Such a simple and flexible technique can be applied for a wide range of applications such as signage, pictograms, advertising, smart packaging, etc.

Green-synthesized, low-cost tetracyanodiazafluorene (TCAF) as electron injection material for organic light-emitting diodes

2019 ◽  
Vol 30 (11) ◽  
pp. 1969-1973 ◽  
Author(s):  
Bing Yang ◽  
Jianfeng Zhao ◽  
Zepeng Wang ◽  
Zhenlin Yang ◽  
Zongqiong Lin ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Low Cost ◽  
Electron Injection ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Injection Material ◽  
Organic Light

scholarly journals 3D-printable cell crowding device enables imaging of live cells in compression

BioTechniques ◽  
2020 ◽  
Vol 68 (5) ◽  
pp. 275-278
Author(s):  
Liam P Dow ◽  
Aimal H Khankhel ◽  
John Abram ◽  
Megan T Valentine
Keyword(s):  
Low Cost ◽  
Optical Microscope ◽  
Live Cells ◽  
Epithelial Monolayers ◽  
Low Profile ◽  
Wide Range ◽  
Multiple Devices ◽  
Microscopy Techniques ◽  
High Resolution Microscopy

We designed and fabricated, using low-cost 3D printing technologies, a device that enables direct control of cell density in epithelial monolayers. The device operates by varying the tension of a silicone substrate upon which the cells are adhered. Multiple devices can be manufactured easily and placed in any standard incubator. This allows long-term culturing of cells on pretensioned substrates until the user decreases the tension, thereby inducing compressive forces in plane and subsequent instantaneous cell crowding. Moreover, the low-profile device is completely portable and can be mounted directly onto an inverted optical microscope. This enables visualization of the morphology and dynamics of living cells in stretched or compressed conditions using a wide range of high-resolution microscopy techniques.

scholarly journals Low-cost photoacoustic imaging systems based on laser diode and light-emitting diode excitation

2017 ◽  
Vol 10 (04) ◽  
pp. 1730003 ◽  
Author(s):  
Qingkai Yao ◽  
Yu Ding ◽  
Guodong Liu ◽  
Lvming Zeng
Keyword(s):  
Laser Diode ◽  
Near Infrared ◽  
Photoacoustic Imaging ◽  
Light Emitting Diode ◽  
Imaging Modality ◽  
Low Cost ◽  
Laser System ◽  
Great Promise ◽  
Light Emitting ◽  
Wide Range

Photoacoustic imaging, an emerging biomedical imaging modality, holds great promise for preclinical and clinical researches. It combines the high optical contrast and high ultrasound resolution by converting laser excitation into ultrasonic emission. In order to generate photoacoustic signal efficiently, bulky Q-switched solid-state laser systems are most commonly used as excitation sources and hence limit its commercialization. As an alternative, the miniaturized semiconductor laser system has the advantages of being inexpensive, compact, and robust, which makes a significant effect on production-forming design. It is also desirable to obtain a wavelength in a wide range from visible to near-infrared spectrum for multispectral applications. Focussing on practical aspect, this paper reviews the state-of-the-art developments of low-cost photoacoustic system with laser diode and light-emitting diode excitation source and highlights a few representative installations in the past decade.

scholarly journals A Mini Review on pH-Sensitive Photoluminescence in Carbon Nanodots

2021 ◽  
Vol 8 ◽  
Author(s):  
Cui Liu ◽  
Fang Zhang ◽  
Jiao Hu ◽  
Wenhui Gao ◽  
Mingzhen Zhang
Keyword(s):  
Optical Properties ◽  
Low Cost ◽  
Ph Sensitive ◽  
Research Progress ◽  
Future Research ◽  
Carbon Nanodots ◽  
Ph Sensing ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Wide Range

Carbon nanodots (C-dots) with sp2/sp3 framework and diameter of <10 nm contain abundant functional groups or polymers on their surface. C-dots have attracted immense attention because of their unique optical properties, excellent biocompatibility, facile preparation, and low cost. With these merits, C-dots have been used in a wide range of applications including sensing, bioimaging, catalysis, and light-emitting devices. C-dots exhibit good optical properties, such as tunable emission wavelength, good photostability, nonblinking, up-conversion emission, etc. Of note, C-dots show intrinsic pH-sensitive photoluminescence (PL), indicating their great potential for pH sensing, especially in biotic pH sensing. In this review, we systematically summarize the pH-sensitive PL properties and the pH-sensitive PL mechanism, as well as recent research progress of C-dots in pH sensing. The current challenges of pH-sensitive C-dots and their future research focus are also proposed here. We anticipate this review might be of great significance for understanding the characteristics of pH-sensitive C-dots and the development of photoluminescent nanomaterials with pH-sensitive properties.

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