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Deuterium Substitution Increases the Lifetime of Fluorescent Blue by 20%
June 14, 2020

​Currently, fluorescent blue emitters by Idemitsu Kosan and SFC are used in most OLED displays, but even after years of maturity, their efficiency and lifetime are well below phosphorescent green and red.  Panel manufacturers want greater blue performance and have begun using deuterium substitution technology for replacing hydrogen in the emitter compound. Panel makers differentiate by substituting the compound before or after synthesizing or completely substituting for the hydrogen. Suppliers of the deuterium substitution include Idemitsu Kosan, DuPont, SFC, and JNC.
 
According to the patent specification related to deuterium substitution, a compound substituted with deuterium having an atomic mass of deuterium that is twice as high as hydrogen has lower ground energy and lower molecular energy due to lower zero point energy and lower vibrational energy than compounds combined with hydrogen. It becomes weak and can make the thin film into an amorphous state, thereby improving the heat resistance more effectively and improving the life of the OLED. Companies report an increased lifetime 20% greater than conventional configurations. Source: UBI