Improved drive voltages of organic electroluminescent devices with an efficient p-type aromatic diamine hole-injection layer

Ganzorig, Chimed; Fujihira, Masamichi
December 2000
Applied Physics Letters;12/18/2000, Vol. 77 Issue 25
Academic Journal
An SbCl[sub 5]-doped N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD) thin film was studied as a hole-injection layer in low-molecular-weight organic electroluminescent (EL) devices. EL characteristics of devices with a TPD hole-injection layer doped with other oxidizing reagents, such as iodine, FeCl[sub 3], and tris(4-bromophenyl)aminium hexachloroantimonate were compared with that of SbCl[sub 5]-doped TPD. The device with SbCl[sub 5]-doped TPD on a cleaned indium-tin-oxide (ITO) substrate exhibited the best performance of all the devices studied. The improvement in device performance was attributed to an increase in work function of ITO due to acid formation as a result of hydrolysis of SbCl[sub 5] and by thinning the tunneling barrier for hole injection due to formation of the space charge region in highly doped TPD with SbCl[sub 5]. © 2000 American Institute of Physics.


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