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E. Polikarpov, J. S. Swensen, L. Cosimbescu, P. K. Koech, J. E. Rainbolt and A. B. Padmaperuma, “Emission Zone Control in Blue Organic Electrophosphorescent Devices through Chemical Modification of Host Materials,” Applied Physics Letters, Vol. 96, No. 5, 2010, Article ID 053306. doi:10.1063/1.3298556

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• TITLE: Electron Transport Materials: Synthesis, Properties and Device Performance

  AUTHORS: Lelia Cosimbescu, Liang Wang, Monte L. Helm, Evgueni Polikarpov, James S. Swensen, Asanga B. Padmaperuma

  KEYWORDS: Electron Transport; OLED; Triplet Energy

  JOURNAL NAME: International Journal of Organic Chemistry, Vol.2 No.2, June 27, 2012

  ABSTRACT: We report the design, synthesis and characterization, thermal and photophysical properties of two silane based electron transport materials, dibenzo[b,d]thiophen-2-yltriphenylsilane (Si?87) and (dibenzo[b,d]thiophen-2-yl)diphenylsilane (Siφ88) and their performance in blue organic light emitting devices (OLEDs). The utility of these materials in blue OLEDs with iridium (III) bis[(4,6-difluorophenyl)-pyridinato-N,C2’]picolinate (Firpic) as the phosphorescent emitter was demonstrated. Using the silane Siφ87 as the electron transport material (ETm), an EQE of 18.2% was obtained, with a power efficiency of 24.3 lm/W (5.8V at 1 mA/cm2), in a heterostructure. When Siφ88 is used, the EQE is 18.5% with a power efficiency of 26.0 lm/W (5.5V at 1 mA/cm2).