Blue OLEDs are colours used in screen displays in smartphone and high-end TVs.
The improvement means that the efficiencies of blue OLEDs in these devices could jump from about 5% to 20% or better in the near future.
"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.
Green and red PHOLEDs are already used in new TVs — as well as in Samsung and LG smartphones — but the blues are fluorescent.
"Having a blue phosphorescent pixel is an important challenge but they have not lived long enough," Forrest added.
The efficient blues will make a significant dent in power consumption for large-screen TVs and extend battery life in smartphones.
The lifetime improvement will also help prevent blue from dimming relative to red and green over time.
"In a display, it would be very noticeable to your eye," Forrest noted.
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