title: Synthesis and photophysical properties of novel butterfly-shaped blue emitters based on pyrene.
abstract: Using 1,3,5,9-tetrabromo-7-tert-butylpyrene as the bromide precursor, a series of novel butterfly-shaped 1,3,5,9-tetraaryl substituted pyrene derivatives were synthesized by the Suzuki-Miyaura cross-coupling reaction. Their thermal, photophysical, electrochemical and related properties were systematically investigated. All compounds were found to exhibit high thermal stabilities with decomposition temperatures (Td) of up to 300 °C. All compounds show highly blue fluorescence emissions in the spectral region of 412-469 nm in solution (Φf: 0.45-0.92) and 410-470 nm in the solid- state (Φf: 0.48-0.75). It is noteworthy that these butterfly-shaped pyrenes 4 possess low-lying HOMO levels ranging from -4.76 to -5.93 eV, which make them promising candidates in OLED applications.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Saga University, Honjo-machi 1, Saga 840-8502, Japan. yamatot@cc.saga-u.ac.jp.
authors.forename: Xing
authors.initials: X
authors.lastname: Feng
authors.forename: Jian-Yong
authors.initials: JY
authors.lastname: Hu
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Tomiyasu
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Seto
authors.forename: Carl
authors.initials: C
authors.lastname: Redshaw
authors.forename: Mark R J
authors.initials: MR
authors.lastname: Elsegood
authors.forename: Takehiko
authors.initials: T
authors.lastname: Yamato