Thermally stimulated luminescence of naphthyl-substituted benzidine derivative and tris-8-(hydroxyquinoline) aluminum with and without metal layers
Conference
·
OSTI ID:20034151
Multilayer organic light emitting devices based on tris-8-(hydroxyquinoline) aluminum (Alq{sub 3}) and a naphthyl-substituted benzidine derivative (NPB) have demonstrated practical electroluminescence with a wide range of color. Trap states in these materials play an important role in the carrier transport as well as the light emission process. The authors report the first observation of thermally stimulated luminescence (TSL) from Alq{sub 3} and NPB. The TSL spectra from 8K to 300K were used to determine the trap states in Alq{sub 3} and NPB. The results for Alq{sub 3} show a significant trap distribution at 156K, which corresponds to a mean trap depth ranging from 0.18 to 0.12 eV, whereas the trap states in NPB are centered from 0.15 eV to 0.01 eV. The authors have used TSL to study the trap state properties of thin metal layers in the Alq{sub 3} films. In addition, they report photoluminescence as a function of temperature for Alq{sub 3}. TSL spectroscopy provides a technique to study the trap states in a specific layer of the device structure.
- Research Organization:
- Univ. of Rochester, NY (US)
- Sponsoring Organization:
- Defense Advanced Research Project Agency; National Science Foundation
- OSTI ID:
- 20034151
- Country of Publication:
- United States
- Language:
- English
Similar Records
White light emission from exciplex using tris-(8-hydroxyquinoline)aluminum as chromaticity-tuning layer
Permanent polarization and charge distribution in organic light-emitting diodes (OLEDs): Insights from near-infrared charge-modulation spectroscopy of an operating OLED
Observation of the temperature dependence of the dynamics of photoexcited states in pristine tris(8-hydroxyquinoline) aluminum (AlQ{sub 3})
Journal Article
·
Mon Jun 18 00:00:00 EDT 2001
· Applied Physics Letters
·
OSTI ID:40204518
Permanent polarization and charge distribution in organic light-emitting diodes (OLEDs): Insights from near-infrared charge-modulation spectroscopy of an operating OLED
Journal Article
·
Fri Mar 21 00:00:00 EDT 2014
· Journal of Applied Physics
·
OSTI ID:22271209
Observation of the temperature dependence of the dynamics of photoexcited states in pristine tris(8-hydroxyquinoline) aluminum (AlQ{sub 3})
Conference
·
Wed Jul 01 00:00:00 EDT 1998
·
OSTI ID:20034142