Lighting

Scientists Build Thinnest-Possible LEDs To Be Stronger, More Energy Efficient

University of Washington Most modern electronics, from flat-screen TVs and smartphones to wearable technologies and computer monitors, use tiny light-emitting diodes, or LEDs. These LEDs are based on semiconductors that emit light with the movement of electrons. As devices get smaller and faster, there is more demand for semiconductors that are tinier, stronger and more energy efficient.

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LED Drivers Use Less Energy, Produce More Light With Gallium Nitride Transistors

Fraunhofer Institute for Applied Solid State Physics IAF Researchers at Fraunhofer Institute for Applied Solid State Physics IAF have found a way to make LED lamps even more compact while supplying more light than commercially available models. The key to success is transistors made of the semiconductor material gallium nitride.

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Artificial Metamaterial Could Speed Up Underwater Communications

University of California, San Diego University of California, San Diego electrical engineering professor Zhaowei Liu and colleagues have taken the first steps in a project to develop fast-blinking LED systems for underwater optical communications. Earlier this year, Liu and his colleagues showed that an artificial metamaterial can increase the light intensity and “blink speed” of a fluorescent light-emitting dye molecule. The nanopatterned layers of silver and silicon in the new material sped up the molecule’s blink rate to 76 times faster than normal, while producing an 80-fold increase in its brightness.

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Novel LEDs Pave The Way To Cheaper Displays

Researchers from the universities of Bonn and Regensburg have developed a novel type of organic light-emitting diode (OLED). These lights are suitable for the design of particularly energy-efficient cheap displays, which find applications in smart phones, tablet PCs or TVs. Applications in lighting such as in luminescent tiles are also conceivable.

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Wire-to-Board Connector

ERNI (Richmond, VA) has developed a compact and economical wire-to-board interconnect solution with high current density in a small, 2.0mm pitch form factor. The iBridge™ single-row cable connector system delivers up to 5A per contact at 20 °C when paired with an appropriate discrete wire. The male iBridge connectors are available in right angle and vertical configurations with DIP solder termination for extra mechanical strain relief, or SMT termination with durable solder brackets for maximum PCB real estate usage and a high PCB retention force. Offered in 2, 3, 4, 5, 6, and 8 positions with additional sizes up to 12 in development, the iBridge connectors utilize crimp and poke wire terminations.

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Based LEDs

Visual Communications Company (VCC) (Poway, CA) has introduced based LEDs designed to serve as drop-in replacements for outmoded T1-3/4 and T3-1/4 incandescent lamps. Available in a range of base designs, including wedge, bayonet, midget flange, and midget groove, the LEDs feature average lifespans of 100,000 hours.

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Ballast Control ICs

International Rectifier (El Segundo, CA) has introduced a control IC for magnetic ballasts used in fluorescent lamps. Available in a compact SO8 package, the IRS2538DS integrates a 600V half-bridge control circuit, bootstrap MOSFET, and protection features. The IRS2538DS also includes pre-heat, ignition, and running lamp modes; closed-loop lamp current control; fixed preheat time (2s typical); adaptive deadtime (0.5us to 1.5us typical); lamp insert auto-restart; micropower start-up (125uA); and an internal 15.6V Zener diode clamp on Vcc.

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