LG Display announced on the 1st that it successfully verified the performance of blue phosphorescent OLED (organic light-emitting diode) panel production on its mass production line, becoming the first in the world to do so.
The emission methods of OLED panels are broadly categorized into fluorescence and phosphorescence. Fluorescence is a simple method that reacts immediately when electricity is applied, but its emission efficiency is only 25%.
In contrast, phosphorescence involves storing energy briefly after receiving electricity before emitting light. While the technical difficulty is high, its emission efficiency reaches 100%.
An OLED panel that implements all three primary colors of light (red, green, blue) using phosphorescence is referred to as "the dream OLED," but achieving phosphorescence in blue has been challenging due to its short wavelength and high energy requirement.
LG Display addressed this issue with a "hybrid two-stack tandem" structure that stacks blue fluorescent materials on the bottom layer and blue phosphorescent materials on the top layer. This configuration maintains the stability of existing OLED panels while reducing power consumption by about 15%.
LG Display is the first to succeed in the productization stage, which requires performance evaluation, optical characteristics, and process verification on an actual mass production line. It has also completed product verification in collaboration with Universal Display Corporation (UDC) in the United States.
LG Display has independently filed patents for its hybrid phosphorescent blue tandem technology in both Korea and the United States.
LG Display will showcase the OLED panel employing this technology at the world's largest display event, "SID 2025," starting on the 11th (local time) in the United States. The exhibited products will include medium-sized panels suitable for IT devices such as smartphones and tablets.
Yoon Soo-young, LG Display's Chief Technology Officer (CTO), noted, "The successful productization verification of blue phosphorescent materials, referred to as the last puzzle for the dream OLED, will be an innovative milestone toward the next generation of OLEDs."