Synthesis and Characterization of Un-doped Deep-Blue Organic Light-Emitting Materials Containing Spirofluorene and Biphenyl or Substituted Biphenyl

A series of novel blue light-emitting materials, spirofluorene derivatives, DBSF, 3DBSF, and 5DBSF, based on 2′,7′-dibromospiro- benzoc]fluorene-7,9′-fluorene] (DBrSPFF) were successfully synthesized and identified by IR, ¹H-NMR, and¹³C-NMR, MS. Optical properties were examined by UV-Vis absorption spectra and photoluminescence (PL) emission spectra. They performed great blue light characteristics. PL quantum yield was calculated by using quinine sulphate in 0.1M H₂SO₄ as standard. Electro-chemical behavior was examined through cyclic voltammeter measurement. They may be potential promising blue light-emitting materials for OLED.