Merck’s Blue Ink Material Lifetime Announced 65% Improvement Year-over-Year.

At ‘Display Insight 2021’ held online on November 4th, ‘Joachim Kaiser’, global application manager of Merck, presented ‘Our OLED solutions – livilux®’. When presenting the ink portion of livilux’s OLED materials, Kaiser noted that “Inkjet printing is the only technology that combines RGB parallel pixel layout with scalability for large display sizes”.

Kaiser announced “Maximizing the performance of IJP devices requires a thorough understanding and optimization of state-of-the-art OLED materials, ink formulations optimized for each application, and the entire device stack” and “Merck can get a lot of benefits from IJP performance improvement from its experience in developing materials for deposition”.

Comparing the performance announced by Merck last year and this year, the luminous efficiency (cd/A) of red increased by 46% compared to the previous year, green by 10%, and blue did not change. External quantum efficiency (EQE) was 34.1%, increased by 20% for red, and 28%, increased by 5% for green, and there was no change in blue like the luminous efficiency. In terms of lifespan, 20% for green and 65% for blue were greatly improved. The lifespan of the red is 4,000 hours based on LT95 (last year’s red’s lifespan was 8,300 hours based on LT95), and it is being optimized to increase the lifetime reduced by improving efficiency.

Kaiser emphasized, “At Merck, we are constantly working to provide solutions to the problems of OLED panel design, such as improving the efficiency of Blue OLED, a new kind of emitter, and RGB side-by-side printing technology.”