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Paper | Special issue | Vol 56, No. 1-2, 2002, pp.421-431
Published online, 1st January, 1970
DOI: 10.3987/COM-01-S(K)64
Preparation of 4,7-Dihetaryl-1,2,5-oxadiazolo[3,4-c]pyridines as Red Fluorescent Materials

Hideki Gorohmaru, Thies Thiemann, Tsuyoshi Sawada, Kazufumi Takahashi,* Katsumi Nishi-i, Naoko Ochi, Yoshio Kosugi, and Shuntaro Mataka*

*Instituete of Advanced Material Study, Kyushu University, 6-1, Kasuga-koen, Kasuga 816-8580, Japan

Abstract

A series of 1,2,5-oxadiazolo[3,4-c]pyridines (6, 7, 8 and 10) with thiophene, furan, and benzothiophene rings at the 4 and 7 positions were prepared, in quest of a red fluorescent material useful in OLED devices. Compound (6, 7, 8 and 10) emit fluorescence of orange to red color in solution and in the solid state. 6-Cyano derivatives (6) show a higher quantum yield than the corresponding esters (7), the phenyl derivative (8), and the unsubstituted compound (10). Red EL light at λ = 680 nm was obtained in an OLED device when 4,7-bis(5-phenylthien-2-yl) ester (7h) was used as a dopant emitter.