Abstract
Highly efficient electrophosphorescent organic light-emitting diodes (PHOLEDs)
containing mixed hosts of bis(3,5-di(9H-carbazol-9-yl)phenyl)diphenylsilane (SimCP2) and
1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phenylene (OXD-7) and a soluble
derivative of the green emitter fac-tris(2-phenylpyridine)iridium (III)
[(Ir(ppy)<sub>3</sub>] have been demonstrated. All organic layers were mixed in a
single layer for solution processing during the fabrication of the PHOLEDs. The
amorphous mixed host of SimCP2:OXD-7:Ir(ppy)<sub>3</sub> exhibited ambipolar charge
transport as well as high hole and electron mobilities on the order of 10<sup>-7</sup>
cm<sup>2</sup>/Vs from space-charge-limited current measurement. The values of both the hole
and electron mobilities were 100 times greater than that of the widely used
poly(9-vinylcarbazole) (PVK):OXD-7:Ir(ppy)<sub>3</sub> host, resulting in efficient charge
balance in the SimCP2 host. Based on a simple fabrication process of single-layer
PHOLED, a green device with the maximum luminous and power efficiencies of 42 cd/A and
20 lm/W, respectively, was obtained at 600 cd/m<sup>2</sup>.
© 2011 IEEE
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