LED tagged posts

Work resolves mystery and offers new path for light-emitting and other devices. Electrical engineers have reported solving a lingering question about how a 2D crystal composed of cesium, lead and bromine emitted a strong green light, opening the door to designing better light-emitting and diagnostic devices.

Crystals that produce light on the green spectrum are desirable because green light, while valuable in itself, can also be relatively easily converted to other forms that emit blue or red light, making it especially important for optical applic...

Under UV light, the SLAO phosphor emits either green-yellow or blue light depending on the chemical activator mixed in. Credit: David Baillot/UC San Diego Jacobs School of Engineering

A team led by engineers at the University of California San Diego has used data mining and computational tools to discover a new phosphor material for white LEDs that is inexpensive and easy to make. Researchers built prototype white LED light bulbs using the new phosphor. The prototypes exhibited better color quality than many commercial LEDs currently on the market.

Phosphors, which are substances that emit light, are one of the key ingredients to make white LEDs. They are crystalline powders that absorb energy from blue or near-UV light and emit light in the visible spectrum...

This animation shows molecular building blocks joining the tip of a growing nanowire. Each block consists of a diamondoid — the smallest possible bit of diamond — attached to sulfur and copper atoms (yellow and brown spheres). Like LEGO blocks, they only fit together in certain ways that are determined by their size and shape. The copper and sulfur atoms form a conductive wire in the middle, and the diamondoids form an insulating outer shell. Credit: SLAC National Accelerator Laboratory

LEGO-style building method has potential for making 1-dimensional materials with extraordinary properties...

Assistant Professor of Physics Hanwei Gao, left, and Associate Professor of Chemical Engineering Biwu Ma, right, look at their new LED. Credit: Bruce Palmer/Florida State University

Florida State University materials researchers has developed a new type of LED, using an organic-inorganic hybrid, organometal halide perovskites, that could lead to cheaper, brighter and mass produced lights and displays in the future. Perovskites are any materials with the same type of crystal structure as calcium titanium oxide.

After months of experiments using synthetic chemistry to fine-tune the material properties and device engineering to control the device architectures, they ultimately created an LED that performed even better than expected. The material glowed exceptionally bright...