Does tris-(8-hydroxyquinolinato) aluminum transport holes?

Liang-Bih Lin; Ralph H. Young; David S. Weiss; Samson A. Jenekhe; Paul M. Borsenberger

doi:10.1117/12.284176

1 December 1997 Does tris-(8-hydroxyquinolinato) aluminum transport holes?

Liang-Bih Lin, Ralph H. Young, David S. Weiss, Samson A. Jenekhe, Paul M. Borsenberger

Proceedings Volume 3148, Organic Light-Emitting Materials and Devices; (1997) https://doi.org/10.1117/12.284176
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Hole transporting properties of tris-(8-hydroxyquinolinato) aluminum (Alq) were investigated using time-of-flight (TOF) photocurrent transients and photoinduced discharge techniques. A thin layer of Alq was inserted between two hole transporting layers. Within the time domain of the photocurrent transients,the fraction of holes escaping from one side of the Alq layer to the other side is strongly field, temperature, and Alq thickness dependent. The results of photoinduced discharge experiments indicate that eventually the holes escaped the trilayer samples. The injection barrier is estimated to be approximately 0.12 eV. The hole penetration range is estimated to be 10-30 angstrom in the range of field strengths studied, therefore suggesting the recombination zone of electrons and holes in Alq-containing electroluminescent (EL) devices is confined close to the interface of Alq and the hole transporting layer. The results demonstrate the importance of the hole injection barriers and hole trapping to the performance of organic EL devices using Alq as the electron transporting and emissive layer.

Citation Download Citation

Liang-Bih Lin, Ralph H. Young, David S. Weiss, Samson A. Jenekhe, and Paul M. Borsenberger "Does tris-(8-hydroxyquinolinato) aluminum transport holes?", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); https://doi.org/10.1117/12.284176

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available