Electron mobility of 4,7-diphyenyl-1,10-phenanthroline estimated by using space-charge-limited currents

The electron mobility of 4,7-diphyenyl-1,10-phenanthroline (BPhen) at various thicknesses (50–300nm) has been estimated by using space-charge-limited current measurements. The measured bulk mobility is in excellent agreement with results from time-of-flight method. It has been observed that the electron mobility of BPhen approaches its true value when the thickness is more than 150nm. The estimated electron mobility of BPhen at 300nm is found to be 3.4×10−4cm2∕Vs (at 0.3MV∕cm) with weak dependence on electric field. For thickness typical of organic light-emitting devices, the electron mobility of BPhen is also investigated.

[1]  J. Curless,et al.  Organic light-emitting diodes with a bipolar transport layer , 1999 .

[2]  R. Österbacka,et al.  Transient electroluminescence: mobility and response time in quinquethiophene Langmuir-Blodgett films , 1997 .

[3]  H. Tokuhisa,et al.  Electron drift mobility of oxadiazole derivatives doped in polycarbonate , 1995 .

[4]  J. Jang,et al.  Relationship between indium tin oxide surface treatment and hole injection in C60 modified devices , 2006 .

[5]  J. J. M. Vleggaar,et al.  Electron and hole transport in poly(p‐phenylene vinylene) devices , 1996 .

[6]  W. D. Gill.  Drift mobilities in amorphous charge‐transfer complexes of trinitrofluorenone and poly‐n‐vinylcarbazole , 1972 .

[7]  Electron transport in starburst phenylquinoxalines , 1999 .

[8]  George G. Malliaras,et al.  Temperature- and field-dependent electron and hole mobilities in polymer light-emitting diodes , 1999 .

[9]  S. Forrest,et al.  Highly efficient phosphorescent emission from organic electroluminescent devices , 1998, Nature.

[10]  W. Brütting,et al.  Electron transport in a starburst oxadiazole , 1997 .

[11]  Junsheng Yu,et al.  Influence of sensitizer on organic electroluminescence , 2001 .

[12]  Ta-Ya Chu,et al.  Hole mobility of N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl) benzidine investigated by using space-charge-limited currents , 2007 .

[13]  C. Tang,et al.  Organic Electroluminescent Diodes , 1987 .

[14]  George G. Malliaras,et al.  Electrical characteristics and efficiency of single-layer organic light-emitting diodes , 1998 .

[15]  M. Stössel,et al.  Space-charge-limited electron currents in 8-hydroxyquinoline aluminum , 2000 .

[16]  Daoben Zhu,et al.  High-efficiency low operation voltage organic light-emitting diodes , 2007 .

[17]  George G. Malliaras,et al.  Nondispersive electron transport in Alq3 , 2001 .

[18]  S. Jenekhe,et al.  High electron mobility in bipolar composites of organic molecules , 1996 .

[19]  Tetsuo Tsutsui,et al.  High electron mobility in bathophenanthroline , 2000 .

[20]  Ching Wan Tang,et al.  Organic electroluminescent devices with improved stability , 1996 .

[21]  S. So,et al.  Electron transit time and reliable mobility measurements from thick film hydroxyquinoline-based organic light-emitting diode , 2003 .