Masaru Kinoshita | Researchain

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SID Symposium Digest of Technical Papers | 2003

45.3: Tetra‐Substituted Pyrenes: New Class of Blue Emitter for Organic Light‐Emitting Diodes

Wataru Sotoyama; Hiroyuki Sato; Masaru Kinoshita; Toshiro Takahashi; Azuma Matsuura; Jun Kodama; Norio Sawatari; Hiroshi Inoue

We have developed a new class of highly-fluorescent blue emitter for organic light-emitting diodes (OLEDs) consisting of tetra-substituted pyrenes. From the analysis of the excited state diagrams of pyrene and its derivatives by molecular orbital calculations, we found that the new tetra-substituted pyrenes are highly fluorescent. OLEDs fabricated using the synthesized tetra-substituted pyrenes as emitters showed high efficiency and good color purity.

SID Symposium Digest of Technical Papers | 2010

39.3: Material and Device Structure Design of Blue Phosphorescent OLEDs for High Efficiency and Enhanced Stability

Wataru Sotoyama; Tasuku Satoh; Masaru Kinoshita; Manabu Tobise; Kouji Kawato; Toshihiro Ise; Hiroo Takizawa; Seiji Yamashita

We developed stable and efficient blue phosphorescent materials for OLEDs on the basis of the evaluation of their stability under UV irradiation. Structures of OLEDs with the above-stated materials were improved with the aid of a method to estimate the site distribution of exciton formation in the emissive layer by doping a small amount of fluorophore in it with varied position. The improved blue phosphorescent OLED exhibited high external quantum efficiency (7.9%) with a half life of 10,000 h on a practical luminance (360 cd/m2).

Archive | 2002