Akademik Veri Yönetim Sistemi
Turkish Journal of Chemistry, cilt.39, sa.5, ss.917-929, 2015 (SCI-Expanded, Scopus, TRDizin)
A series of solution processable, wide band-gap host materials composed of carbazole and tetraphenylsilane groups were designed and synthesized. Their thermal, electrochemical, and photophysical properties were fully investigated. The introduction of bulky tetraphenylsilane and tert-butyl groups around the carbazole led to high glass transition temperatures (Tg) between 120 and 204 ◦ C. The triplet energies (E T ) of the synthesized materials were examined by low temperature (77 K) photoluminescence studies and determined as E T > 2.6 for all compounds. Phosphorescent organic light-emitting devices with the ITO/PEDOT:PSS/EML/TPBi/Cs 2 CO3 /Al device structure were fabricated by using synthesized materials as the host and two kinds of phosphorescent emitters, FIrpic and Ir(ppy) 3 , as the guests. The highest luminous and power efficiency values obtained by using FIrpic were 3.6 cd A −1 and 1.48 lm W−1 , respectively, with commission International de I Eclairage (CIE) coordinates of (0.17, 0.36), whereas these values were 7.8 cd A −1 and 2.9 lm W−1 for the device structure when Ir(ppy) 3 was used as the guest [CIE (0.28, 0.62)].