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New blue OLEDs increase smartphones battery life

New blue OLEDs increase smartphones battery life

By BizLED Bureau

August 1, 2015: New blue OLEDs increase smartphones battery life. Researchers at University of Michigan have extended the lifetime of blue organic light emitting diodes (OLEDs), which will lead to longer battery life in smartphones and better TV display screens. This research is titled ?Ten-Fold Increase in the Lifetime of Blue Phosphorescent Organic Light Emitting Diodes.

Blue OLEDs are colours used in screen displays in smartphone and high-end TVs. Green and red PHOLEDs are already used in new TVs and smartphones, for example, in Samsung and LG smartphones.

This improvement will increase efficiency of blue OLEDs in these devices by about 5% to 20% or better in the near future.

The efficient blues will cut down on power consumption for large-screen TVs and even increase battery life in smartphones. The lifetime improvement will also help prevent blue from dimming relative to red and green over time.

“Phosphorescent OLEDs, also known as PHOLEDs, produce light through a mechanism that is four times more efficient than fluorescent OLEDs,” said Stephen Forrest, a Paul G. Goebel professor of engineering at University of Michigan. “Having a blue phosphorescent pixel is an important challenge but they have not lived long enough,” he added.

The study showed that high energies required to produce blue light are more damaging when the brightness is increased to levels needed for displays or lighting.

“That early work showed why the blue PHOLED lifetime is short, but it didn’t provide a viable strategy for increasing the lifetime,” said Yifan Zhang, the first author on the new study. “We tried to use this understanding to design a new type of blue PHOLED.”

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