Two-Dimensional Material Shows Promise for Optoelectronics

Team creates LEDs, photovoltaic cells, and light detectors using novel one-molecule-thick material.

A team of MIT researchers has used a novel material that’s just a few atoms thick to create devices that can harness or emit light. This proof-of-concept could lead to ultra-thin, lightweight, and flexible photovoltaic cells, light emitting diodes (LEDs), and other optoelectronic devices.

Posted in: Briefs, Lighting, Downsizing, Optics, Optics, Research and development, Materials properties

Improving the Efficiency of Green-Blue-Ultraviolet Light-Emitting Diodes

New approach could lead to the creation of low threshold lasers and high power light emitting diodes (LEDs).

Scientists at the U.S. Naval Research Laboratory (NRL) have suggested a method that could significantly increase the efficiency of green-blue-ultraviolet light-emitting diodes based on GaInN/GaN, AlGaN/GaN, and AlInN/GaN quantum wells. Their approach could enable advances in solid state lighting and the creation of low threshold lasers and high power light emitting diodes (LEDs).

Posted in: Briefs, Lighting, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Research and development

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

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.

Posted in: News, Lighting, Downsizing, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Semiconductors

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

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.

Posted in: News, Lighting, Downsizing, Light emitting diodes (LEDs), Transistors, Light emitting diodes (LEDs), Transistors, Semiconductors

Artificial Metamaterial Could Speed Up Underwater Communications

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.

Posted in: News, Lighting, Light emitting diodes (LEDs), Wireless communication systems, Light emitting diodes (LEDs), Wireless communication systems, Product development, Marine vehicles and equipment

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.

Posted in: News, Lighting, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Energy conservation, Displays, Displays, Product development

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.

Posted in: Products, Lighting, Connectors and terminals, Wiring, Connectors and terminals, Wiring

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.

Posted in: Products, Lighting, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Reliability, Reliability

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.

Posted in: Products, Lighting, Exterior lighting, Electronic control units, Integrated circuits, Electronic control units, Integrated circuits, Interior lighting, Interior lighting

Chip-on-Board (COB) LEDs

Everlight Electronics Co. Ltd. (Taipei, Taiwan) has expanded its high performance JU series of chip-on-board (COB) LEDs to include 7, 10 and 15 W types in addition to the existing 4W version. The JU series now consists of four JU1215 (15×12×1.6mm) and one JU2024 (20×24×1.6mm) type/s with powers ranging from 4 watts to 15 watts. All types provide an efficacy of 110lm/W or more at 3000K CCT, a CRI of >80Ra and 25° C substrate temperature, and are available in versions ranging from ANSI bin 2,700 K to 6,500 K.

Posted in: Products, Lighting, Integrated circuits, Light emitting diodes (LEDs), Integrated circuits, Light emitting diodes (LEDs)

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.