Infrared Light Emitting Diodes

how can i disguise the red dot of an infrared diode?

an infared diode always shines a dim red light at its bulb..is there a way i can hide this reddish light without disrupting the real infrared beam that it emits

Use an IR filter...like the dark redish purple plastic that's on the front of VCR's. I think using a few layers of photo negatives will work as well. The IR should easily pass through those and block the red.

Light-Emitting Diodes (Hardcover) $186.1 Revised and fully up-dated, the second edition of this graduate textbook offers a comprehensive explanation of the technology and physics of LEDs such as infrared, visible-spectrum, ultraviolet, and white LEDs made from III-V semiconductors. Elementary properties such as electrical and optical characteristics are reviewed, followed by the analysis of advanced device structures. With nine additional chapters, the treatment of LEDs has been vastly expanded, including new material on device packaging, reflectors, UV LEDs, III-V nitride materials, solid-state sources for illumination applications, and junction temperature. Radiative and non-radiative recombination dynamics, methods for improving light extraction, high-efficiency and high-power device designs, white-light emitters with wavelength-converting phosphor materials, optical reflectors, and spontaneous recombination in resonant-cavity structures are discussed in detail. With exercises, solutions, and illustrative examples, this textbook will be of interest to scientists and engineers working on LEDs and graduate students in electrical engineering, applied physics, and materials science.

Light-Emitting Diodes $87.75 No Synopsis Available

Organic Light Emitting Diodes (Hardcover) $385.4 Addressing the development of the organic light emitting diode (OLED) based on rare-earth and transition-metal complexes—Europium, Terbium, Ruthenium, and Rhenium—this unique perspective explains how these materials can be used to build organic-LEDs, from chemistry synthesis to device operation and the related charge transfer and confinement. Examining how organic materials can be used to build organic-LEDs, the relationship between the chemistry molecule "design," and state-of-the-art and expected pathways, this intelligent report provides intensive experimental results for scientists and engineers working in this new OLED framework, while maintaining a didactic utility for graduation students and teachers studying optoelectronics.

Polymer Light Emitting Diodes Based on Polyfluorenes $138.61 This work is devoted to the study on Polymer Light Emitting Diodes (PLEDs) based on polyfluorenes, a promising class of semiconductive polymers for lightemitting diode applications. It covers theories of PLEDs, literature overview of polyfluorenebased lightemitting diodes, as well as research results by the authors. In this study, several types of PLED devices based on neat polyfluorenes or polyfluorene blends were designed, fabricated, and characterized. The electrical characteristics of two neat polyfluorenes were simulated via using space charge limited current theory for the holeonly case and/or exploiting a commercial software package. Author: Zhang, Qiushu/ Zivanovic, Sandra Binding Type: Paperback Number of Pages: 164 Publication Date: 2010/08/16 Language: English Dimensions: 5.98 x 9.01 x 0.37 inches

Light-emitting Diodes and Optoelectronics (Hardcover) $369.61 Description not available.

Electroluminescence in Organic Light-emitting Diodes $80.93 No Synopsis Available

Blue Laser and Light Emitting Diodes II $95.55 No Synopsis Available

Organic Light-Emitting Diodes: Principles, Characteristics & Processes $233.95 No Synopsis Available

Organic Light Emitting Diodes : The Use of Rare Earth and Transition Metals $146.2 No Synopsis Available

Introduction to Nitride Semiconductor Blue Lasers and Light Emitting Diodes $204.7 No Synopsis Available

Red and Near Infrared Microcavity LightEmitting Diodes $196.21 Lighting is essential to modern society but it accounts for nearly 20 of the electrical energy usage. Thus efforts to increase the conversion efficiencies of light sources are attracting more and more attention. Potential high efficiency light sources are fluorescent lamps or lightemitting diodes (LEDs). Modern LEDs show internal quantum efficiencies of virtually 100 . However, in the case of standard LEDs most of this light is trapped inside the device because of total internal reflection at the interface semiconductorair. Several methods have been developed in order to increase the extraction efficiency. This can be done either by optimizing the device geometry in order to increase the escape cone or by incorporating a resonant structure in order to force the internal emission into the existing escape cone. The latter approach is called microcavity LED (MCLED) or resonant cavity LED (RCLED) and is presented in detail in this work. Novel concepts to further increase the external quantum efficiency are discussed and experimental results are presented. Author: Joray, Reto Binding Type: Paperback Number of Pages: 268 Publication Date: 2009/05/01 Language: English Dimensions: 9.00 x 6.00 x 0.56 inches

CarbazoleBased Emitting Compounds $141.79 Carbazole is a heterocyclic tricyclic aromatic organic compound consisting of two sixmembered benzene rings fused on either side of a fivemembered nitrogencontaining ring. A large number of carbazole derivatives have been designed and synthesized and organic electronic devices based on these derivatives such as organic light emitting diodes (OLEDs), have been investigated. The optical and electrical properties of carbazoles are affected by substitution on the 2, 3, 6, 7 and 9Hpositions. Many carbazole derivatives have sufficiently high triplet energy to make them an efficient host where they can serve as red, green, or blue triplet emitters. Highly fluorescent and stable carbazolebased compounds were synthesized and characterized. Substitution of carbazoles at 3 and 6 position by tertbutyl group enhanced the solubility. Suitably susbtituted carbazoles form highly stable fluorescent organic nanoparticles. The emission of these nanoparticles was reversibly switched on/off in the bluegreen and orangered regions from a change in the ratio of the tetrahydrofuran/water system used in their preparation. Author: Adhikari, Ravi/ Neckers, Dr Douglas C. Binding Type: Paperback Number of Pages: 192 Publication Date: 2010/05/05 Language: English Dimensions: 5.98 x 9.01 x 0.44 inches

Fundamentals of High-Efficiency OLEDS: Basic Science to Manufacturing of Organic Light-Emitting Diodes $126.7 No Synopsis Available

Principles of Solar Cells, Leds and Diodes (Hardcover) $364.39 The book will cover the two most important applications of semiconductor diodes – solar cells and LEDs - together with quantitative coverage of the physics of the PN junction at the senior undergraduate level. It will include: Review of semiconductor physicsIntroduction to PN diodesThe solar cellPhysics of efficient conversion of sunlight into electrical energy  Semiconductor solar cell materials and device physicsAdvanced solar cell materials and devicesThe light emitting diodePhysics of efficient conversion of electrical energy into lightSemiconductor light emitting diode materials  and device physicsAdvanced light emitting diode materials and devices

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Infrared LEDs

Go Green With LED Lights in your Homes and Gardens

History and introduction of LED lightings

LED’s have been around since the 60s, but have mostly been relegated to showing the time in an alarm clock or the battery level of a video camera. Its use as a source of illumination was a challenging one for scientists. Light Emitting Diodes or LED Lightings- differ from traditional light sources in the way they produce light. In incandescent bulbs, a tungsten filament is heated by electric current until it glows or emits light. In a fluorescent lamp, an electric arc excites mercury atoms, which emit ultraviolet (UV) radiation. After striking the phosphor coating on the inside of glass tubes, the UV radiation is converted and emitted as visible light. On other hand LED’s are diodes made from semi-conductor materials. This is why they are referred to as “solid state” devices and relies on indium gallium nitride to convert electricity into photons with help of direct current (DC) instead of alternating current (AC) There are other types of Lights which on the principle of solid state objects like semi conductor but LED's are the most relevant for general illumination. It consists of a chip of semi-conducting material treated to create an electric circuit. An LED is usually a small area source, often with extra optics added to the chip that shapes its radiation pattern. The specific wavelength or color emitted by the LED depends on the materials used to make the diode. It depends on the composition and condition of the semi conducting material used, and can be infrared, visible, or near-ultraviolet. Red LED’s are based on aluminum gallium arsenide (AlGaAs). Blue LED’s are made from indium gallium nitride (InGaN) and green from aluminum gallium phosphide (AlGaP). "White" light is created by combining the light from red, green, and blue (RGB) LED’s or by coating a blue LED with yellow phosphor. LED based lights are still under development but it is predicted it will radically change the energy consumption patterns of the world over the next few years. As such there’s a phenomenal amount of resources being devoted to improving LED technology worldwide. The U.S. has committed an uncharacteristically large amount of industrial policy support for LED research and development. Asia is a hotbed of cutting-edge manufacturing technology and Europe and Canada have led the way in energy efficient initiatives accompanied by some of some of the most innovative design styles you can find anywhere.

Advantages and disadvantages of LED lightings

They have extremely low power consumption. LED lights use up to 90% less power than normal lights, which has many more advantages than you would ever assume. Firstly electrical running costs are reduced, not only reducing the demand placed on your household energy consumption but feel good knowing you are saving energy and becoming green, the global warming factor. Along the same line, the other major advantage of LED lights is that you can connect multiple sets of LED lights together from only one plug or socket, more sets than non LED lights due to the lower power consumption. This is not only practical resulting in the requirement for less power sockets, but you can lit larger multiple area with little drilling of your walls. Just imagine powering a string of lights ½ mile long from a single electrical socket. With LED’s you can use more light than ever before and still save money. While the small energy draw of LED’s would indicate many more could be strung together, until the UL listing is changed for the standard plug connected light sets, it is prudent to adhere to the current regulations for risk management. Since LED lights don’t contain any energy hungry materials, they are very efficacious-convert energy to light, not heat as non LED’s lights do. These make them intrinsically safe and are generally cool to the touch. LED’s lights can provide with 50,000 hours or more of life, which can tremendously reduce maintenance costs and time. This means, assuming an average twelve hour night, you will not need to change your LED lights after a good eleven year. In comparison, an incandescent light bulb lasts approximately 1,000 hours. Fluorescents are rated for 10,000 hours under ideal conditions. Along with this LED lights are incredibly bright, 3 times brighter than traditional lights, this makes them ideal for a wide range of situations, offering much greater impact and appeal than subdued traditional bulbs. The known problem of replacing blown and the inconvenience and undesired appearance of multiple failed bulbs isn't an issue with LED's. With such a long bulb life you can be sure of a fully functioning set of lights, which can be happily left outside requiring no maintenance and minimal routine care. Further mentioning the longevity of LED lights, LED’s are manufactured as one solid piece, with no glass or filaments to break. As such these lights are resistant to shock and vibration, which makes them more durable than non LED lights. Plus they have better quality light output since they have minimum ultraviolet and infrared radiation. LED lights have much greater design freedom in terms of color flexibility including many “whites” – without the use of filters, fully dimmable, new form factors for fixture designs which give us innumerable options to look for. Lastly the most important benefits if you are environment conscious is LED’s unlike Fluorescent and mercury vapor lighting which contains mercury, a hazardous waste to the environment and must be disposed of properly, LED’s don’t contain mercury and are not considered hazardous waste designating them environmental friendly.

Shopping guide for LED lightings

LED lights have started flooding the market but before purchase see to it what are you looking for. LED lights were initially started to be used in commercial environments like entertainment shows, theaters etc. Also, LED lights are already the best light source for traffic signals, vehicular tail lights, emergency lighting and flashlights. Increasingly nowadays, Home LED lightings such as accent wall LED lights, task, landscape and even outdoor LED lighting such as garden Pole LED lightings have arrived in the market. After deciding upon the type of LED lighting, check the prices around various online shop. Price is a hard thing to remain constant since most companies post retail type prices online and are willing to accept your bargain call for bulk purchases. Your best bet is to have a specific LED lighting type in mind and browse through several LED light shop. Check the kind of warranties the selected shop is giving you in terms of lamp life span and durability of LED lights. The light output declines over time so at some point, though the lamp is technically lit, it is not providing the same effect as intended in the beginning. Market pitching shop owner will seem to claim very high lamp life, while more honest LED shop will opt for the lower numbers. A reasonable lamp life for most LED’s seen in the market is around 50,000 hours but if it is more see what kind of warranties and return policy is in place if the claim is not fulfilled by the seller.

As we can see LED lightings have so many benefits compared to other form of lightings that sooner or later its usage will be common. More widespread use could lead to big energy savings and a revolution in the way we think about lighting. And We at For your Home would be part of these revolution, would you like to join?

You can also read this article in our news and article section at;

http://www.foryourhome.co.uk/led-lightings-lighting-revolution-on-the-way/articles/36.html

About the Author

We at For your Home are specialist in helping you make better homes and gardens. You are always welcome to visit our online store at http://www.foryourhome.co.uk and our Home and outdoor LED lighting section at http://www.foryourhome.co.uk/home-led-lighting/c/373_475.html