scholarly journals An Emergency Portable Ventilator for COVID Patients with Acute Breathing Difficulty

2020 ◽  
Vol 10 (1) ◽  
pp. 251-255
Keyword(s):  
Light Emitting Diodes ◽  
Low Cost ◽  
Medical Personnel ◽  
Waiting Period ◽  
Light Emitting ◽  
Breathing Difficulty

In this paper, a design of a ventilator that meets the demand for emergency ventilators required to help patients with acute breathing difficulty during pandemics such as the current COVID-19 pandemic is presented. The AMBU bag based ventilator can be fabricated at low cost and is easily affordable by hospitals. Based on readily available components, the ventilator will cost about INR6000, and can be easily maintained by even non-technical medical personnel. It works on regular AC supply of 220V and runs on 12V DC supply drawing about 1.5A current. The ventilator is light in weight weighing about 2Kg and is easily portable. The use of individually addressable light emitting diodes and a photo- resistor for positioning of the pushrod is an innovative feature of the ventilator. It meets the requirement of emergency ventilators for use during the waiting period before a full fledged ventilator is available to the patient.

Halide Perovskite Based Light-emitting Diodes: A Scaling Up Perspective

2021 ◽  
Author(s):  
Ting Zhang ◽  
Lin Wang ◽  
Lingmei Kong ◽  
Chengxi Zhang ◽  
Haiyong He ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Low Cost ◽  
Scaling Up ◽  
Color Gamut ◽  
High Definition ◽  
Light Emitting ◽  
Metal Halide Perovskite ◽  
Wide Color Gamut ◽  
Halide Perovskite ◽  
High Color Purity

Metal halide perovskite light-emitting diodes (PeLEDs) have aroused extensive attention due to their high color purity, wide color gamut, low-cost solution processability, showing great potential for application in next-generation high-definition...

Solution Processed Fabrication of Perovskite Light-Emitting Diodes: Towards Low Cost and Commercial Applications

2021 ◽  
Author(s):  
Jianfeng Zhang ◽  
Bin Wei ◽  
Lin Wang ◽  
Xuyong Yang
Keyword(s):  
Light Emitting Diodes ◽  
Low Cost ◽  
Color Purity ◽  
Color Gamut ◽  
Light Emitting ◽  
Metal Halide Perovskite ◽  
Wide Color Gamut ◽  
Halide Perovskite ◽  
Commercial Applications ◽  
High Color Purity

Metal halide perovskite light-emitting diodes (PeLEDs) have emerged as one of the most promising candidates for next-generation high-resolution displays, due to their wide color gamut, high color purity and low-cost...

scholarly journals Enhanced Optical Output of Near-Ultraviolet Light-Emitting Diodes by a Monolayer of Nanospheres

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Wei Wan ◽  
Zhanxu Chen ◽  
Yongzhu Chen ◽  
Gengyan Chen
Keyword(s):  
Indium Tin Oxide ◽  
Light Emitting Diodes ◽  
Low Cost ◽  
Incident Light ◽  
Light Extraction Efficiency ◽  
Light Emitting ◽  
Hexagonal Close Packed ◽  
Exit Surface ◽  
Near Ultraviolet ◽  
Optical Output

The optical output of near-ultraviolet (NUV) light-emitting diodes (LEDs) was improved by including a monolayer of hexagonal close-packed polystyrene (PS) nanospheres. PS nanospheres with different sizes were deposited on the indium tin oxide layer of the NUV LEDs. The electroluminescence results showed that the light extraction efficiency of the NUV LEDs was increased by the inclusion of PS nanospheres, and the maximum optical output enhancement was obtained when the size of the nanospheres was close to the light wavelength. The largest enhancement of the optical output of 1.27-fold was obtained at an injection current of 100 mA. The enhanced optical output was attributed to part of the incident light beyond the critical angle being extracted when the exit surface of the NUV LEDs had a PS nanosphere monolayer. This method may serve as a low-cost and effective approach to raise the efficiency of NUV LEDs.

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
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