make blue

To make blue light, electricity excites heavy metal-containing phosphorescent organic molecules.

That kind of lifespan could finally make blue PHOLEDs hardy enough to be commercially viable in lights that meet the Department of Energy's 50,000-hour lifetime target.

“It’s really complicated for plants to make blue,” says Beverley Glover, a botanist at the University of Cambridge.

“It’s going to make blue places bluer.”

The Postal Inspection Service is working with the Postal Service to make blue boxes more secure, like fitting them with “rakes” with metal teeth to make it harder for thieves to fish out envelopes, said Michael W. Martel, a spokesman for the inspection service.