Design considerations for enhancing LED efficiency

Phosphor-converted white LEDs are ubiquitous today, although there is still significant room from improvement in terms of optical efficiency. Packaged LED manufacturers spend considerable time constantly improving all elements of component design,The object from Impact crusher, such as crushing cavity eduction foreign body in row ore use card mouth cavity drainage system, clear, make foreign bodies continue to increase ore discharge cone crusher cavity. Cone crusher in spring, the function of row ore automatic reset, and mouth cone crusher machine resume normal work. manufacturing, and packaging to optimize efficiency. In this article,Solar Street Light has great prospective as a power resource for various types of personal houses and companies. Many individuals know this fact that getting LED bulb from the sun is a fresh, environmental-friendly way to produce power. But many individuals don't know about solar, however, is that the power Lighting is affordable for many homeowners. we will cover the latest trends in chips, optics and package architecture. These details are increasingly important all of the way through the solid-state lighting (SSL) supply chain and even lighting designers and specifiers need to understand the unique properties of LED sources.LEDs have a rich history, and many people on many continents have put quite a bit of work into them over the last several decades. The first LEDs we would recognize as such today were red and arrived in the 1950s, followed by yellow, orange, and green LEDs in the 1960s and 70s. The semiconductor materials for these colors are the gallium phosphide (GaP) materials: gallium arsenide phosphide (GaAsP), aluminium gallium indium phosphide (AlGaInP), and GaP.
These early LEDs were acceptable for some applications, such as indicator lights, but without higher power and a blue source, they were not suitable for general, white-lighting purposes. Fortunately, a breakthrough from Shuji Nakamura (while at Nichia) in the early 1990s solved this problem. He developed nitride-based semiconductors – specifically those using indium gallium nitride (InGaN) – which allowed blue light to be produced.After blue was available, it was found that green could be made with InGaN materials. There was also a substantial effort to improve red LEDs (e.g., for stop lights and tail lamps on cars),Large crushing quantity, high capacity,with the special design, low maintanance cost, high efficiency. Compared with conventional equipment, the Gyratory crusher has such features:large crushing ratio,even granularity, low consumption,Cone Crusher can crush all kind of mining ore materials, is an ideal energy-saving ultra-fine crushing equipment. and some design teams pursued white-light solutions using RGB mixing (for instance, using AlGaInP to make red and InGaN to make green and blue). For many general lighting applications, however, the RGB approach has been abandoned in favor of InGaN-based, blue-LED-chip-plus-phosphor (typically yttrium aluminium garnet (YAG) materials) solutions. The phosphor-converted LEDs are simpler, more robust devices when white light at a single color temperature is desired, requiring no active color feedback electronics, and fewer individual LED chips.
For InGaN-based LEDs, the GaN-type epitaxial layers (crystalline deposition layer – in this case the GaN materials – over a crystalline substrate that it is in registry with) are typically grown on a sapphire substrate, or in some cases silicon carbide. Sapphire is chosen due to its wide availability, crystalline symmetry, ease of handling, and transparency. LED efficiency has multiple components. It can be divided up into at least five parts: ηelectrical , the electrical contacts and resistance losses; ηIQE , the internal quantum efficiency of the active layer; ηLex, the light extraction from the chip; ηphosphor , the phosphor conversion efficiency when making white LEDs; and ηpackage, the light extraction out of the LED package.