Researchers have created the highly efficient blue light using organic light-emitting diodes (OLEDs) These advanced light sources are already in our devices, but now the team has overcome a major hurdle: making blue light more efficient and longer-lasting. This could usher in a new era of screen technology that’s easier on your eyes, your wallet, and the planet. Modern screens create their rainbow of colors by mixing just three core components: red, green, and blue.