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Proceedings Paper

Charge injection and transport in spiro-linked arylamine compounds
Author(s): W. H. Choi; S. K. So
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Paper 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.

Paper Details

Date Published: 27 August 2009
PDF: 9 pages
Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151L (27 August 2009); doi: 10.1117/12.825555
Show Author Affiliations
W. H. Choi, Hong Kong Baptist Univ. (Hong Kong, China)
S. K. So, Hong Kong Baptist Univ. (Hong Kong, China)

Published in SPIE Proceedings Vol. 7415:
Organic Light Emitting Materials and Devices XIII
Franky So; Chihaya Adachi, Editor(s)

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