The synthesis and characterization of two spirobifluorene derivatives Ph3CSBFL and Ph3SiSBFL (SBFL= 9, 9-spirobifluoren-2-yl) have been demonstrated for their application as host materials in blue phosphorescent organic light emitting diodes (PHOLED). When both of the molecules were designed to maintain high singlet and triplet energies, Ph3CSBFL was specially designed to contain pure carbon carbon backbones in order to achieve a higher molecular stability. Large HOMO/LUMO gaps and high triplet energies were observed for these two materials. Blue FIrpic (FIrpic = iridium(III) bis[2-(4, 6-difluorophenyl)-pyridinato-N, C2]-picolinate) phosphorescent devices were fabricated using these two materials as hosts.   Charge balance was achieved for both devices, leading to pure FIrpic emissions. High external efficiencies were also achieved for both devices.

Carbon based spirobifluorene hosts for blue phosphorescent organic light emitting diodes

239th National Meeting (2010)

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