Author(s)

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

Department of Chemistry, Fort Lewis College, Durango, USA.
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, USA.

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).

Electron Transport; OLED; Triplet Energy

L. Cosimbescu, L. Wang, M. Helm, E. Polikarpov, J. Swensen and A. Padmaperuma, "Electron Transport Materials: Synthesis, Properties and Device Performance," International Journal of Organic Chemistry, Vol. 2 No. 2, 2012, pp. 101-110. doi: 10.4236/ijoc.2012.22016.