Results 71 to 80 of about 295,332 (287)

Investigation into the Effects of Cross-Sectional Shape and Size on the Light-Extraction Efficiency of GaN-Based Blue Nanorod Light-Emitting Diode Structures

Crystals
We investigated the effect of cross-sectional shape and size on the light-extraction efficiency (LEE) of GaN-based blue nanorod light-emitting diode (LED) structures using numerical simulations based on finite-difference time-domain methods. For accurate
Bohae Lee, Han-Youl Ryu
doaj   +1 more source

PARK(ing) time–How park deficiency affects the biological clock in a Drosophila model of Parkinson's disease

FEBS Letters, EarlyView.
Drosophila park mutants serve as a model for Parkinson's disease. We used this strain to investigate the connection between oxidative stress and the circadian clock mechanism. We showed that increased oxidative stress affects the physiology of pacemaker cells, disrupting their daily structural plasticity. Lack of rhythmic signaling from pacemaker cells
Kamila Zientara, Kinga Skoczek, Elzbieta Pyza, Milena Damulewicz   +3 more
wiley   +1 more source

Influence of photonic nanotexture on the light extraction efficiency of GaN [PDF]

Applied Physics Letters, 2007
The authors report the effects of nanoscale texturing on the optical properties of GaN. The texture consists of circular holes etched in a hexagonal array with 1μm spacing. Hole diameters range from 120to700nm and depths range up to 1μm. The optical properties are studied using cathodoluminescence (CL) measurements in a scanning electron microscope ...
L. Tian, N. Stojanovic, D. Y. Song, A. A. Bernussi, J. M. Berg, M. Holtz   +5 more
openaire   +1 more source

Structural insights and therapeutic targets in Acinetobacter baumannii capsule biosynthesis

FEBS Letters, EarlyView.
Hypervirulent KL49 A. baumannii's capsular polysaccharide contains the nonulosonic acid 8‐epi‐Leg5,7Ac2, synthesized by epimerization via ElaA, ElaB, and ElaC. Crystal structures of ElaA, ElaB, and ElaC reveal their role in CMP‐Leg5,7Ac2 synthesis and regioselective C8 epimerization.
Woo Cheol Lee, Junho Jeong, Chae Yeong Lee, Hyunjoon Cho, Man Hwan Oh, Je Chul Lee, Jee‐Young Lee, Yangmee Kim   +7 more
wiley   +1 more source

Light extraction efficiency enhancement of colloidal quantum dot light-emitting diodes using large-scale nanopillar arrays

, 2014
A colloidal quantum dot light-emitting diode (QLED) is reported with substantially enhanced light extraction efficiency by applying a layer of large-scale, low-cost, periodic nanopillar arrays. Zinc oxide nanopillars are grown on the glass surface of the
Hilmi Volkan Demir, Demir, Hilmi Volkan, Mutlugun, E., Wang, J., Evren Mutlugun, Tang, Yuxin, Yuxin Tang, Zhao, Yongbiao, Yang, X., Yang, Xuyong, Sun, X. W., Xuyong Yang, Dang, C., Xiao Wei Sun, Cuong Dang, Tan, Swee Tiam, Mutlugun, Evren, Dev, Kapil, Sun, Xiao Wei, Dang, Cuong, Tan S.T., Swee Tiam Tan, Zhao Y., Wang, Jianxiong, Liu, S., Shuwei Liu, Kapil Dev, Jianxiong Wang, Dev, K., Tang, Y., Liu, Shuwei, Yongbiao Zhao   +31 more
core   +1 more source

Light Extraction Efficiency in III-Nitride LEDs

Asia Communications and Photonics Conference, 2012
Light extraction efficiency (LEE) of GaN-based LEDs is limits mainly by the high refractive index of GaN. We will introduce methods proposed previously and present new methods to further enhance LEE of GaN-based LEDs.
openaire   +2 more sources

Silicon nanocrystal-based photonic crystal slabs with broadband and efficient directional light emission

Scientific Reports, 2017
Light extraction from a thin planar layer can be increased by introducing a two-dimensional periodic pattern on its surface. This structure, the so-called photonic crystal (PhC) slab, then not only enhances the extraction efficiency of light but can ...
L. Ondič, M. Varga, I. Pelant, J. Valenta, A. Kromka, R. G. Elliman   +5 more
doaj   +1 more source

Three phosphatase families form a community: The phosphohydrolases that act upon inositol pyrophosphates

FEBS Letters, EarlyView.
Inositol pyrophosphates are energy‐rich signaling molecules that perform critical functions in cells. Three different families of phosphatases hydrolyze the β phosphate of the inositol pyrophosphate molecules: two have narrow specificities and one is promiscuous.
Ronda J. Rolfes
wiley   +1 more source

Enhanced Light Extraction Efficiency from GaN Light Emitting Diodes Using Photonic Crystal Grating Structures

, 2010
Gallium nitride (GaN) light emitting diodes (LED) embody a large field of research that aims to replace inefficient, conventional light sources with LEDs that have lower power, higher luminosity, and longer lifetime. This thesis presents an international
Trieu, Simeon S
core   +1 more source

Light Extraction Efficiency Analysis of Flip-Chip Ultraviolet Light-Emitting Diodes With Patterned Sapphire Substrate

IEEE Photonics Journal, 2018
This study investigates polarization-dependent light extraction efficiency (ηextraction ) of AlGaN-based flip-chip ultraviolet (UV) light-emitting diodes (LEDs) emitting at 230 nm and 280 nm with microdome-shaped patterning on sapphire ...
Yu Kee Ooi, Jing Zhang
doaj   +1 more source