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sun c optical design led solid state lighting guide 2022

Type:: E-books
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Size:: 62.3 MB
Uploaded On:: Nov. 27, 2022, 2:40 p.m.
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Info Hash:: 92B879959AD16C2ACD882852A3EDA466C852923A

Textbook in PDF format Light-emitting diodes (LEDs) are considered the most important light source of the 21st century owing to advantages of energy saving, long life, fast response, high colour performance, and environmental benefit. We believe that accurately understanding the light performances of LEDs and using them skilfully is an important capability for optical designers. This book provides an overview of the light performance of LED SSL and can further effectively apply optical design to SSL at different levels. Optical Design for SSL is classified into four levels including LED die, package, component, and system. All approaches are aimed at teaching readers to precisely determine the spatial and chromatic light performance of an LED and increasing the optical utilization factor of an LED luminaire to achieve optical energy efficiency. LED is a semiconductor device that can convert electrical energy into light energy. To understand the working principle of LEDs, we must first introduce the concept of semiconductors. Semiconductors are solid-state objects of which the electrical conductivity is between conductors and insulators. They are essentially a crystallized structure with atoms that are stacked up neatly. In general, when many atoms combine to form solid matter, there will be interactions between the peripheral electrons of the neighboring atoms. As the attractive and repulsive forces act simultaneously, a stable equilibrium state is finally reached. In the process of solid formation, some significant changes will be produced in the electron energy level, resulting in materials with different characteristics, such as conductors, insulators, and semiconductors. From the perspective of energy state, these stable electrons have lower energy and form a valence band. If some of the electrons obtain energy from the external actions, such as heating, illuminating, or electrifying, these excited electrons will then be free to move between atoms. Such free moving electrons can conduct electricity or heat. Because of their higher energy state, they form a conductive band. The energy difference between the conduction band and the valence band is called the ‘band gap.’ Generally speaking, physical systems tend to go to a low-energy state, so, electrons first fill up the valence band. Key Features Presents an essential guidebook for optical design in LED Lighting Includes thorough explanations of LED light performance and limitations Proposes four-level optical design in LED lighting Includes chapter summaries Provides a reader-friendly approach to ensure precision Introduction of LED solid-state lighting Basic optics LED die-level light extraction optics LED package-level primary optics Light source modeling LED component-level secondary optics LED system-level LED lighting optics

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Sun C. Optical Design for LED Solid State Lighting. A Guide 2022.pdf 62.3 MB

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sun c optical design led solid state lighting guide 2022

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