Results 21 to 30 of about 1,353,383 (365)
Design rules for white light emitters with high light extraction efficiency
Optics Express, 2019 The finite-difference time-domain method is employed to study the light extraction efficiency of white light emitters. The cone arrays designed on top of white light emitters eliminate the dependency of light extraction on the wavelength and the cavity thickness and that leads to significant enhancement in light extraction efficiency for whole visible ...
Peifen Zhu +3 more
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Ultra-directional and high-efficiency µLEDs via gradient index filled micro-horn collimators [PDF]
Scientific ReportsMicro-LEDs (µLEDs) are poised to transform near-eye AR/VR, display, and optical communication technologies, but they are currently hindered by low light extraction efficiency and non-directional emission. Our study introduces an innovative approach using
Alexander Luce, Rasoul Alaee, Aimi Abass
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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.
Shoou‐Jinn Chang
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Optics Express, 2018 In this work, combined analysis of internal strain effects on optical polarization and internal quantum efficiency (IQE) were conducted for the first time.
Hanling Long +8 more
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Sidewall Suppression and Top Surface Enhancement of Light Extraction Efficiency in Vertically Stacked Full‐Color Micro‐LEDs Based on L‐Shaped Metal Walls [PDF]
Advanced Electronic MaterialsMicro light‐emitting diodes (Micro‐LEDs) are regarded as the core of next‐generation display technology due to their high brightness and energy efficiency. However, the reduction in the size of Micro‐LEDs has led to increased manufacturing challenges and
Huachang Guo +9 more
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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
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Simple Process for Flexible Light-Extracting QD Film and White OLED [PDF]
MicromachinesQuantum dots (QDs) have tremendous potential for next-generation displays due to their high color purity, photoluminescence efficiency, and power efficiency. In this work, we present a simple and cost-effective method for fabricating flexible single- and
Eun Jeong Bae +6 more
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Investigation on Wavelength-Dependent Light Extraction Efficiency of InGaN-Based Micro-LED Structures Using Numerical Simulations [PDF]
PhotonicsThe external quantum efficiency (EQE) of InGaN-based LEDs typically decreases as wavelength shifts from blue to green to red. While this trend has often been attributed to the internal quantum efficiency of InGaN quantum wells (QWs), the influence of ...
Chibuzo Onwukaeme, Han-Youl Ryu
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Optics Express, 2019 We report on the demonstration of top emitting AlGaN tunnel junction deep ultraviolet (UV) light emitting didoes (LEDs) operating at ∼267 nm. We show, both theoretically and experimentally, that the light extraction efficiency can be enhanced by nearly a factor of two with the incorporation of AlGaN nanowire photonic crystal structures.
Walter Shin +4 more
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IEEE Photonics Journal, 2016 The effects of 2-D hexagonal-lattice TiO 2 photonic crystal layers on the directional light extraction efficiency of low-scattering (Y 1-xCe x) 3Al 5O 12 (YAG:Ce 3+) ceramic converters have been investigated.
Haiding Sun +3 more
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