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The Light Extraction Efficiency for DUV LEDs
2019DUV LEDs have very low light extraction efficiency (LEE), which is caused by the unique optical polarization and the optically absorptive semiconductor and metal layers. This chapter reviews and analyzes the approaches that have ever been used to improve the LEE.
Zi-Hui Zhang +3 more
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High-efficiency light injection and extraction using fiber bending
Optical Fiber Communication Conference, 2017We achieve a temporary optical coupler that injects/extracts light into/from a fiber with high efficiency by using fiber bending. We demonstrate experimentally that extraction efficiency is improved by using a double-clad fiber.
Takui Uematsu +4 more
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Light Extraction Efficiency of the LED with Guide Layers
Japanese Journal of Applied Physics, 1976An LED with guide layers, which is similar to the DH-structured diode, is devised. By calculating the efficiency ee of extracting the light from the active region to the diode facet within a certain solid angle, we have obtained the following conclusions: (1) If the absorption coefficient αa of the active region is large, ee for the LED with guide ...
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On the Light Extraction Efficiency for III-Nitride-Based Light-Emitting Diodes
2019Considering the large contrast of the refractive index between the air and the III-nitride semiconductor layer, the external quantum efficiency for III-nitride-based light-emitting diodes is strongly influenced by the light extraction efficiency. This chapter reviews the current status for the technologies that have been adopted thus far to improve the
Zi-Hui Zhang +4 more
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Physics of light extraction efficiency in planar microcavity light-emitting diodes
1999We use the modifications of spatial mode distributions in planar microcavities to address the issue of light outcoupling in devices such as LEDs. Whereas detailed calculations are needed to fully model and optimize the structures, we show that a simple picture can be obtained that clarifies the main physical effects of the microcavity.
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Light Extraction Efficiency Improvement Techniques in Light-Emitting Diodes
2023M. Manikandan +4 more
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Enhanced Light Extraction Efficiency via Double Nano-Pattern Arrays for High-Efficiency Deep UV LEDs
Optics and Laser Technology, 2021Jiangnan Dai, Renli Liang, Xiaohang Li
exaly
Improved Light Extraction Efficiency in GaN-Based Light Emitting Diodes
2011The improvement in light extraction efficiency (LEE) of GaN-based LEDs is one of the most important areas for increasing the external quantum efficiency for solid-state lighting applications. We summarize the advances in this field. GaN-based light-emitting diodes (LEDs) have made a lot of progress with regard to growth, doping, and p-ohmic contacts [1–
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