The fabrication of a broad-spectrum light-emitting diode using high-energy ion implantation

1996 ◽  
Vol 8 (9) ◽  
pp. 1145-1147 ◽  
Author(s):  
P.J. Poole ◽  
M. Davies ◽  
M. Dion ◽  
Y. Feng ◽  
S. Charbonneau ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Broad Spectrum ◽  
Light Emitting Diode ◽  
High Energy ◽  
Light Emitting

scholarly journals Increased Plant Quality, Greenhouse Productivity and Energy Efficiency with Broad-Spectrum LED Systems: A Case Study for Thyme (Thymus vulgaris L.)

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 960
Author(s):  
Jenny Manuela Tabbert ◽  
Hartwig Schulz ◽  
Andrea Krähmer
Keyword(s):  
Broad Spectrum ◽  
Energy Savings ◽  
Light Emitting Diode ◽  
Thymus Vulgaris ◽  
Light Spectrum ◽  
Light Emitting ◽  
Biomass Yields ◽  
Lighting Systems

A light-emitting diode (LED) system covering plant-receptive wavebands from ultraviolet to far-red radiation (360 to 760 nm, “white” light spectrum) was investigated for greenhouse productions of Thymus vulgaris L. Biomass yields and amounts of terpenoids were examined, and the lights’ productivity and electrical efficiency were determined. All results were compared to two conventionally used light fixture types (high-pressure sodium lamps (HPS) and fluorescent lights (FL)) under naturally low irradiation conditions during fall and winter in Berlin, Germany. Under LED, development of Thymus vulgaris L. was highly accelerated resulting in distinct fresh yield increases per square meter by 43% and 82.4% compared to HPS and FL, respectively. Dry yields per square meter also increased by 43.1% and 88.6% under LED compared to the HPS and FL lighting systems. While composition of terpenoids remained unaffected, their quantity per gram of leaf dry matter significantly increased under LED and HPS as compared to FL. Further, the power consumption calculations revealed energy savings of 31.3% and 20.1% for LED and FL, respectively, compared to HPS. In conclusion, the implementation of a broad-spectrum LED system has tremendous potential for increasing quantity and quality of Thymus vulgaris L. during naturally insufficient light conditions while significantly reducing energy consumption.

scholarly journals Ion implantation isolation based micro-light-emitting diode device array properties

2020 ◽  
Vol 69 (2) ◽  
pp. 027802
Author(s):  
Cheng-Hao Gao ◽  
Feng Xu ◽  
Li Zhang ◽  
De-Sheng Zhao ◽  
Xing Wei ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Light Emitting Diode ◽  
Light Emitting

Ga(AsP) light‐emitting diode formed by ion implantation

1973 ◽  
Vol 44 (11) ◽  
pp. 4982-4987 ◽  
Author(s):  
Tadatsugu Itoh ◽  
Yasuhisa Oana
Keyword(s):  
Ion Implantation ◽  
Light Emitting Diode ◽  
Light Emitting

Metasurface integrated high energy efficient and high linearly polarized InGaN/GaN light emitting diode

Nanoscale ◽  
2017 ◽  
Vol 9 (26) ◽  
pp. 9104-9111 ◽  
Author(s):  
Miao Wang ◽  
Fuyang Xu ◽  
Yu Lin ◽  
Bing Cao ◽  
Linghua Chen ◽  
...  
Keyword(s):  
Energy Efficient ◽  
Light Emitting Diode ◽  
High Energy ◽  
Light Emitting ◽  
Linearly Polarized

scholarly journals Recycling the GaN Waste from LED Industry by Pressurized Leaching Method

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 861 ◽  
Author(s):  
Wei-Sheng Chen ◽  
Li-Lin Hsu ◽  
Li-Pang Wang
Keyword(s):  
Energy Gap ◽  
Light Emitting Diode ◽  
Economic Value ◽  
Acid Leaching ◽  
High Hardness ◽  
High Energy ◽  
Light Emitting ◽  
Valuable Metals ◽  
Leaching Solution ◽  
Leaching Efficiency

In recent years, with the increasing research and development of the light-emitting diode (LED) industry, which contains gallium nitride (GaN), it is expected that there will be a large amount of related wastes in the future. Gallium has an extremely high economic value, therefore, it is necessary to establish a recycling system for the GaN waste. However, GaN is a direct-gap semiconductor and with its high energy gap, high hardness, and high melting point, these make it difficult to recycle. Therefore, this study will analyze the physical characteristics of LED wastes containing GaN and carry out various leaching methods to leach the valuable metals from the waste optimally. Different acids are used to find out the best reagent for gallium leaching. Different experimental parameters are discussed, such as the effect of the different acid agents, concentration, pressure, liquid-solid mass ratio, temperature and time, which influence the leaching efficiency of gallium. Finally, acid leaching under high pressure is preferred to leach the GaN waste, and hydrochloric acid is used as the leaching solution because of its better leaching efficiency of gallium. Optimally, the leaching efficiency of gallium can reach 98%.

scholarly journals Cell Phone Acne: New Acne Clinical Features in the Coronavirus Disease-19 Era

2021 ◽  
Vol 9 (F) ◽  
pp. 481-485
Author(s):  
Kristin Stephanie Sembiring ◽  
Nelva Karmila Jusuf
Keyword(s):  
Cell Phone ◽  
Heat Dissipation ◽  
Prolonged Exposure ◽  
Light Emitting Diode ◽  
Electronic Devices ◽  
High Energy ◽  
Light Spectrum ◽  
Oil Accumulation ◽  
Light Emitting ◽  
Technological Developments

Technological developments in telecommunications, especially cell phone, enable us to keep communicate without meeting each other. Especially during the latest coronavirus outbreak, when people need to keep up social distance. Meanwhile, electronic devices such as smartphone, tablets, laptops, and light-emitting diode screens are the sources of visible lights that can emit high levels of short-wavelength visible light (blue region in the light spectrum). Prolonged exposure to high-energy blue light, heat dissipation from cell phone, friction, trapped sweat and oil, accumulation of dust, and increased bacterial growth can cause cell phone acne. Management of cell phone acne from prevention to combination therapy based on the results of the evaluation of the severity of acne is needed.

scholarly journals Improved Exposure To Blue Light For Bacterial Death Of Staph

2019 ◽  
Vol 21 (1) ◽  
pp. 13
Author(s):  
Endah Robbiyati
Keyword(s):  
Staphylococcus Aureus ◽  
Light Source ◽  
Blue Light ◽  
Staphylococcus Epidermidis ◽  
Energy Analysis ◽  
Light Emitting Diode ◽  
High Energy ◽  
Light Emitting ◽  
Blue Led ◽  
Correct Energy

ABSTRACTIn this study, bacteria Gram-positive Staphylococcus aureus is exposed to a blue LED light source (light-emitting diode) to determine the appropriate energy to kill the exposure-caused bacteria. The longest exposure times are 1200, 1800, 2400, 3000 seconds, and power 28.098, 56.561, 74.882, and 96.369 MW. The number of bacterial colonies incubated by TPC (total plate number) at 37 degrees 24-48 hours while the plant is alive. Determine the correct energy caused by exposure to the blue LED lamp, therefore, perform mold analysis, non-compliance, and quantitative energy analysis. These results show that the death of streptococcus skin is generally affected by high energy. From this study, we found that 74,882 MW of energy and 179,716.8 MJ of bacteria per 2,400 seconds were the best energy week.Keywords: Staphylococcus epidermidis, a blue LED, exposure time, the power of                   exposure, CFU

scholarly journals Pulp Temperature Rise Induced by Light-Emitting Diode Light-Curing Units Using an Ex Vivo Model

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 411 ◽  
Author(s):  
Alexandra Vinagre ◽  
João Ramos ◽  
Clara Rebelo ◽  
José Basto ◽  
Ana Messias ◽  
...  
Keyword(s):  
Energy Density ◽  
Ex Vivo ◽  
Light Emitting Diode ◽  
Random Sequence ◽  
High Energy ◽  
Low Energy ◽  
Strong Positive Correlation ◽  
Light Emitting ◽  
Pulp Temperature ◽  
Light Curing

The aim of this research was to compare the pulp temperature (PT) rise induced by four light-emitting diode light-curing units (LED LCUs) (Bluephase 20i, Demi Ultra, SPEC 3, and Valo) in different curing modes. Immediately after extraction, the pulp chamber of 11 premolars was accessed from the palatal cervical third of the crown for insertion of fiber Bragg grating (FBG) sensors for temperature measurement and kept in a 37.0° water bath. The teeth were then submitted to a random sequence of curing modes with four irradiations at 30 s intervals. Care was taken to ensure complete pulp temperature reset between curing modes. The curing modes were classified as high-energy (above 80 J/cm2) or low-energy (below 40 J/cm2) according to the total energy density delivered. Statistical analysis was performed with repeated ANOVA measures and Pearson’s correlation for the association between energy density and temperature variation. The significance level was set to 0.05. All curing units promoted a statistically significant PT rise (p < 0.01). After four emissions, the PT rise was higher than 5.0 °C for the high-energy curing modes. The low-energy modes induced approximately a 2.5 °C rise. A strong positive correlation was found between energy density and PT increase (R = 0.715; p = 0.01). Exposure of intact premolars to LED LCUs induced significant and cumulative PT rise. Curing modes emitting high energy densities produced higher PT variations. Radiant exposure was positively correlated to PT variation.

Efficient, Color Stable White Organic Light-Emitting Diode Based on High Energy Level Yellowish-Green Dopants

2008 ◽  
Vol 20 (10) ◽  
pp. 1957-1961 ◽  
Author(s):  
Young-Seo Park ◽  
Jae-Wook Kang ◽  
Dong Min Kang ◽  
Jong-Won Park ◽  
Yoon-Hi Kim ◽  
...  
Keyword(s):  
Energy Level ◽  
Light Emitting Diode ◽  
High Energy ◽  
Light Emitting ◽  
High Energy Level ◽  
Organic Light Emitting Diode ◽  
Yellowish Green ◽  
Organic Light
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