Results 31 to 40 of about 19,360,112 (295)

Epitaxy of III-Nitrides on β-Ga2O3 and Its Vertical Structure LEDs

open access: yesMicromachines, 2019
β-Ga2O3, characterized with high n-type conductivity, little lattice mismatch with III-Nitrides, high transparency (>80%) in blue, and UVA (400–320 nm) as well as UVB (320–280 nm) regions, has great potential as the substrate for ...
Weijiang Li   +6 more
doaj   +1 more source

Effect of the Growth Interruption on the Surface Morphology and Crystalline Quality of MOCVD-Grown h-BN

open access: yesCrystals, 2023
Hexagonal boron nitride (h-BN) is one promising material class for applications in DUV optoelectronics due to the layered structure and ultra-wide bandgap.
Qi Zhang   +7 more
doaj   +1 more source

Advanced LED Solid-State Lighting Optics

open access: yes, 2020
Light-emitting diodes (LEDs) have been intensively studied for white-light lighting since their luminous efficacy exceeds 50 lm/W. Currently, the luminous efficacy of an LED light tube/bulb is almost above 100 lm/W.
Shih-Hsin Ma   +2 more
core   +1 more source

Studies of Scotopic/Photopic Ratios for Color-Tunable White Light-Emitting Diodes

open access: yesIEEE Photonics Journal, 2013
Three- and four-hump InGaN-based white light-emitting diodes (LEDs) have been computationally investigated. The investigation includes three-hump LEDs precoated with green- and red-emitting quantum dots (QDs) and four-hump LEDs precoated with green ...
Zi-Quan Guo   +8 more
doaj   +1 more source

The improvement of GaN-based light-emitting diodes using nanopatterned sapphire substrate with small pattern spacing

open access: yesAIP Advances, 2014
Self-assembly SiO2 nanosphere monolayer template is utilized to fabricate nanopatterned sapphire substrates (NPSSs) with 0-nm, 50-nm, and 120-nm spacing, receptively. The GaN growth on top of NPSS with 0-nm spacing has the best crystal quality because of
Yonghui Zhang   +7 more
doaj   +1 more source

Enhance the Photosynthetic and Color Performances of Multi-Primary White Light-Emitting Diodes for the Indoor Farming

open access: yesIEEE Photonics Journal, 2022
The GaN-based white light-emitting diodes (LEDs) increase the possibility of realizing an ideal spectrum for the growth of plants. At the same time, high photosynthetic action of white LEDs is very crucial for the plant lighting to increase the crops ...
Mengxiao Zhuo   +10 more
doaj   +1 more source

An overview for colour rendering indices in Solid State Lighting [PDF]

open access: yes, 2014
An overview for colour rendering indices in Solid State Lighting [...
Rossi, Maurizio, Musante, Fulvio
core   +1 more source

Tunable bandgap in hybrid perovskite CH3NH3Pb(Br3−yXy) single crystals and photodetector applications

open access: yesAIP Advances, 2016
We report the synthesis of CH3NH3Pb(Br3−yXy) (X=Cl and I) single crystals via a stepwise temperature control approach. High-quality CH3NH3Pb(Br3−yXy) crystals with a tunable bandgap from 1.92eV to 2.53eV have been prepared successfully in this way.
L. Wang   +7 more
doaj   +1 more source

The human gut microbiome across the life course

open access: yesFEBS Letters, EarlyView.
Despite significant individual variation and continuous change throughout life, the human gut microbiome follows some life stage‐specific trends. This article provides a brief overview of how gut microbiome composition shifts across different phases of life. Created in BioRender. Özkurt, E. (2026) https://BioRender.com/8q4nrnc.
Alise J. Ponsero   +4 more
wiley   +1 more source

Characterization of Nepali solid-state lamps [PDF]

open access: yes, 2009
Solid-state lighting technology based on injection electroluminescence devices, light-emitting diodes (LEDs), already found numerous applications in traffic lights, automotive signage, full-colour video displays, liquid crystal display backlighting ...
Chhetri, B.B.   +6 more
core  

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