Tatsundo Kawai

Trap States of Tris-8-(Hydroxyquinoline)Aluminum Degraded by Blue Laser Using Thermally Stimulated Current Method

We investigated the photodegradation phenomena of tris-8-(hydroxyquinoline)aluminum (Alq3) film after irradiation with a blue laser of 442 nm to identify the contributions of the excited states of Alq3 molecules. The photodegraded Alq3 film showed decreases in fluorescence lifetime and carrier transport ability markedly. These photodegradation phenomena are considered to be due to an increase in the energy distribution of trap states detected from the analysis by a thermally stimulated current (TSC) method, in connection with the orientation of neighboring Alq3 molecules, e.g., the disordered aggregation states of Alq3 molecules.

P‐109: High‐Performable Green‐Emitting OLEDs

High-performance green emitters for OLEDs have been studied. New green emitters, C-GEM1, C-GEM2 and C-GEM3, showed high efficiency and long lifetime when making devices using each material as an emitter. The optimized device demonstrated an external quantum efficiency of over 6% and a power efficiency of 26 lm/W at 1,000 cd/m2 with the lifetime of over 25,000 hours.