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Diphenyl-bis[4-(pyridin-3-yl)phenyl]silane, DPPS, has two pyridyl groups attached to the tetra-phyenylsilane. Hence, it is electron-deficient.
Almost considered as an insulator, DPPS is a weak electron-transporting material with a wide bandgap Eg = 4.0 eV. Due to its deep HOMO energy level, DPPS is also used as a hole-blocking layer material in photo-electronic devices.
Nearly 100% Internal Quantum Efficiency in an Organic Blue-Light Electrophosphorescent Device Using a Weak Electron Transporting Material with a Wide Energy Gap, L Xiao et al., Adv. Mater., 21, 1271–1274 (2009); DOI: 10.1002/adma.200802034.
Tetradentate Platinum Complexes for Effi cient and Stable Excimer-Based White OLEDs, T. Fleetham et al., Adv. Funct. Mater., 24, 6066–6073 (2014); DOI: 10.1002/adfm.201401244.
A versatile thermally activated delayed fluorescence emitter for both highly efficient doped and non-doped organic light emitting devices, W-L. Tsai et al., Chem. Commun., 51, 13662 (2015); DOI: 10.1039/c5cc05022g.
Efficient white OLEDs employing red, green, and blue tetradentate platinum phosphorescent emitters, G. E. Norby et al., Org. Electron., 37, 163e168 (2016); doi: 10.1016/j.orgel.2016.06.007.
Novel Benzimidazole Derivatives as Electron-Transporting Type Host To Achieve Highly Efficient Sky-Blue Phosphorescent Organic Light-Emitting Diode (PHOLED) Device, J. Huang et al., Org. Lett., 16 (20), 5398–5401 (2014); DOI: 10.1021/ol502602t.
Nitrogen heterocycle-containing materials for highly efficient phosphorescent OLEDs with low operating voltage, D. Chen et al., J. Mater. Chem. C, 2, 9565 (2014); DOI: 10.1039/c4tc01941e.
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