Results 261 to 270 of about 849,538 (300)

Numerical Simulation for Light Extraction in Nano-Patterned Light-Emitting Diodes

Journal of Nanoscience and Nanotechnology, 2008
We present numerical simulation results using the three-dimensional finite-difference time-domain method for light extraction in light-emitting diodes (LEDs) constructed on nano-patterned n-GaN substrates. We studied reasonable conditions for numerical calculation, including excitation source conditions, simulation size conditions, and boundary ...
Jun-Hee, Hong, Si-Hyun, Park, Jong Rak, Park, Jin-Tae, Kim, Jinseong, Park, Kwang-Woo, Kwon   +5 more
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Improvement for the Light Extraction Efficiency of LightEmitting Diodes

ACTA PHOTONICA SINICA, 2010
The impact of the refractive index and thickness of substrate on the light extraction efficiency of flip-chip LED is analyzed through simulation analysis.And a new diamond-shaped structure is proposed.The results show that the light extraction efficiency is improved to a good purpose in the diamond-shaped LED,resulting in an increase in the light ...
熊伟平 XIONG Weiping, 范广涵 FAN Guanghan, 李琦 LI Qi   +2 more
openaire   +1 more source

Controlling Program Extraction in Light Logics

2011
We present two refinements, based on program extraction in elementary affine logic and light affine logic, of Krivine & Leivant's system FA2. This system allows higher-order equations to specify the computational content of extracted programs. The user can then prove a generic formula, using these equations as axioms.
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Surface patterning of nonscattering phosphors for light extraction

Optics Letters, 2013
A two-dimensional TiO₂ photonic crystal layer is fabricated on Y3Al5O12:Ce3+ (YAG:Ce) yellow ceramic plate phosphor (CPP) to enhance its forward emission. A triangle lattice pattern is defined by molecular transfer lithography with polyvinyl alcohol nanostructured templates.
An, Mao, Robert F, Karlicek
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Light Extraction of High-Efficient Light-Emitting Diodes

2017
This chapter deals with methods for fabricating high-efficient light-emitting diodes (LEDs) with higher light extraction efficiency (LEE). Some LED prototypes are then reviewed to investigate how their performance was enhanced by utilizing a variety of chip processes.
Ja-Yeon Kim, Tak Jeong, Sang Hern Lee, Hwa Sub Oh, Hyung Jo Park, Sang-Mook Kim, Jong Hyeob Baek   +6 more
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LiCompass: Extracting orientation from polarized light

IEEE INFOCOM 2017 - IEEE Conference on Computer Communications, 2017
Accurate orientation information is the key in many applications, ranging from map reconstruction with crowdsourcing data, location data analytics, to accurate indoor localization. Many existing solutions rely on noisy magnetic and inertial sensor data, leading to limited accuracy, while others leverage multiple, dense anchor points to improve the ...
Yu-Lin Wei, Hsin-I Wu, Han-Chung Wang, Hsin-Mu Tsai, Kate Ching-Ju Lin, Rayana Boubezari, Hoa Le Minh, Zabih Ghassemlooy   +7 more
openaire   +1 more source

Flexible Plastic Substrate with a Light Extraction Layer for OLED Lightings

Light, Energy and the Environment, 2017
This study is nano-textured polymer substrate utilized by linear ion beam irraditions for OLED lightings. The substrate contains internal and external light extraction layers for high external quantum efficiency and embedded metal grids for low sheet resistance of transparent electrode.
Sunghoon Jung, Wonmin Ahn, Seunghun Lee, Dogeun Kim   +3 more
openaire   +1 more source

Light extraction from OLEDs using volumetric light scattering

SPIE Proceedings, 2004
One of the limitations on OLED performance is the optical extraction efficiency, η ex , which is the ratio of light generated within the device to light emitted into the ambient. Ideally η ex is equal to unity. Typical estimates for this efficiency factor in OLEDs range between 0.17-0.5.
Joseph Shiang, Tami Faircloth, Anil R. Duggal   +2 more
openaire   +1 more source

Nanograting transfer for light extraction in organic light-emitting devices

Applied Physics Letters, 2011
Damage-free transfer of nanogratings as waveguide mode extraction elements onto the top of top-emission organic light-emitting devices (OLEDs) was realized with the assistance of cyclic olefin copolymer molds. Photoluminescence and electroluminescence measurements together with transfer matrix calculations were used to identify the extracted waveguide ...
Wang, Z., Hauss, J., Vannahme, C., Bog, U., Klinkhammer, S., Zhao, D., Gerken, M., Mappes, T., Lemmer, U.   +8 more
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Light extraction mechanisms in surface-textured light-emitting diodes

SPIE Proceedings, 2001
ABSTRACT Light-emitting diodes (LEDs) with high efficiencies can be fabricated by a combination of surface texturing and the application of a rear reflector. We demonstrate an external quantum efficiency of 43% for unencapsulated surface-textured thin-film LEDs, which increases to 54% after encapsu1ation At low temperatures, the efficiencyof ...
Windisch, Reiner, Meinlschmidt, S., Rooman, Cathleen, Zimmermann, L, Dutta, Barun, Kuijk, Maarten, Kiesel, P., Dohler, Godfried, Borghs, Gustaaf, Heremans, P.   +9 more
openaire   +2 more sources