LG Display Hybrid Phosphorescent Blue Tandem Product Verification and Patent Application

LG Display announced on May 1 that it had successfully verified the performance of a blue phosphorescent OLED panel for mass production for the first time in the world. Following the development of blue phosphorescence in collaboration with UDC last year, this achievement was made in just 8 months, and it is evaluated as one step closer to realizing the ‘dream OLED’.

LG Display solved this problem with a hybrid two-stack tandem structure that stacks blue fluorescent material on the lower layer and blue phosphorescence on the upper layer. By adding the stability of the fluorescent method and the low power of the phosphorescent method, it maintained the stability of the existing OLED panel while reducing power consumption by about 15%.

In particular, LG Display is the first company to have successfully completed the productization stage, which requires performance evaluation, optical characteristics, and fairness on an actual mass production line, and has already completed product verification with UDC.

LG Display has exclusively applied for a hybrid phosphorescent blue tandem technology patent in both Korea and the United States. According to LG Display’s published patent, the hybrid phosphorescent blue tandem is shown to achieve efficiency that is about 1.7 times higher than the existing fluorescent blue tandem. In order to optimize efficiency, color coordinates, and lifespan, the spectral shape of the blue phosphorescent dopant, the thickness ratio of the fluorescent layer and the phosphorescent layer, and the location of the emitting layer are important, and the patent rights the technology content centered on these factors. It is evaluated as a patent that optimizes the commercialization of the hybrid phosphorescent blue tandem by utilizing high-efficiency phosphorescence and long-life fluorescence.

LG Display’s OLED panel with hybrid two-stack tandem applied can be seen at the world’s largest display event, ‘SID (Society for Information Display) 2025’, held in San Jose, California, USA from the 11th of this month (local time). The products on display this time are small and medium-sized panels that can be applied to IT devices such as smartphones and tablets. As the number of products that require both high image quality and high efficiency, such as AI PCs and AR/VR devices, is increasing, the application of blue phosphorescence technology is expected to expand rapidly.

Yoon Soo-young, CTO (Executive Vice President) of LG Display, said, “The success of the verification of blue phosphorescence productization, which is called the last puzzle for the dream OLED, will be an innovative milestone toward next-generation OLED,” and “We expect to be able to enjoy the effect of preempting the future market with blue phosphorescence technology.”

Chang Wook HAN, VP/Analyst, UBI Research(cwhan@ubiresearch.com)