We report on the synthesis of a spiro-fluorene derivative with bulky tert -butyl-substituted triphenylamine structure. The compound was synthesized in an attempt to enhance both hole injection and physical properties. A series of copolymers of the compound and a spiro-anthracenefluorene structure were synthesized, and their physical, optical, and electrochemical characteristics were investigated. The polymers showed good thermal stability with decomposition temperatures in excess of 389 °C and high glass transition temperatures in the range of 112−207 °C. The emission characteristics of the polymers were similar to that of dialkyl polyfluorenes. Cyclic voltametry studies revealed that the energy level of polymers can be tuned by adjusting the spiro-triphenylamine content with a tuning range of about 0.5 eV. Organic light-emitting diodes were fabricated using the polymers. All of the devices showed an emission in the deep blue region, and the copolymers showed improved hole injecting/transporting characteristics.
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Vak et al. (2006) studied this question.
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