Tetraphenylsilane group containing carbazoles as high triplet energy host materials for solution-processable PhOLEDs

Authors : SALİHA ÖNER, İLKER ÖNER, HAYDAR AKDAĞ, CANAN VARLIKLI

Pages : 917-929

View : 13 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :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 \textit{tert}-butyl groups around the carbazole led to high glass transition temperatures insert ignore into journalissuearticles values(T$_{g});$ between 120 and 204 $^{\circ}$C. The triplet energies insert ignore into journalissuearticles values(E$_{T});$ of the synthesized materials were examined by low temperature insert ignore into journalissuearticles values(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$_{2}$CO$_{3}$/Al device structure were fabricated by using synthesized materials as the host and two kinds of phosphorescent emitters, FIrpic and Irinsert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(CIE); coordinates of insert ignore into journalissuearticles values(0.17, 0.36);, whereas these values were 7.8 cd A$^{-1}$ and 2.9 lm W$^{-1}$ for the device structure when Irinsert ignore into journalissuearticles values(ppy);$_{3}$ was used as the guest [CIE insert ignore into journalissuearticles values(0.28, 0.62);].
Keywords : Host material, blue and green PhOLEDs, tetraphenylsilane, carbazole