Charge injection and transport in spiro-linked arylamine compounds

W. H. Choi; S. K. So

doi:10.1117/12.825555

27 August 2009 Charge injection and transport in spiro-linked arylamine compounds

W. H. Choi, S. K. So

Proceedings Volume 7415, Organic Light Emitting Materials and Devices XIII; 74151L (2009) https://doi.org/10.1117/12.825555
Event: SPIE Photonic Devices + Applications, 2009, San Diego, California, United States

Abstract

We use dark-injection space-charge-limited current (DI-SCLC) and admittance spectroscopy (AS) to study charge injection and transport properties of spiro-linked arylamine compounds. Examples are spiro-linked TPD and spiro-linked NPB which are both important amorphous hole transporters for organic light-emitting diodes (OLEDs). With PEDOT:PSS as the hole-injection layer, the contact is demonstrated to be generally Ohmic. Both techniques can be used to measure the carrier mobilities of thick films (>μm) of spiro-compounds. DI-SCLC can be viewed as a pulse technique whereas AS can be treated as an ac technique. For the hole mobilities evaluation of the spiro-compounds, both techniques are in general agreement to each other. However, for the case of the thinner films of less than 1μm, AS is superior over the DI-SCLC technique. The advantages of AS will be highlighted. It appears that AS is broadly applicable to characterize transport properties of organic thin films.

Citation Download Citation

W. H. Choi and S. K. So "Charge injection and transport in spiro-linked arylamine compounds", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151L (27 August 2009); https://doi.org/10.1117/12.825555

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