Morphological effects in the chemical and photoluminescent behavior of aluminum tris(8-hydroxyquinoline) (AlQ{sub 3})
Light emitting diodes (LEDs) based either on sublimable organics or polymeric materials have attracted considerable attention from both the scientific and technological fields. Aluminum tris(8-hydroxyquinoline) (Alq{sub 3}) is presently considered one of the most reliable electron transporting and emitting materials for molecular-based organic light emitting diodes (OLEDs). This paper discusses the effects of sample morphology on the hydrolysis and photoluminescence response of Alq{sub 3}. The evolution of 8-hydroxyquinoline (8-Hq), a volatile byproduct of the hydrolysis of Alq{sub 3}, was quantified using gas chromatography/mass spectroscopy (GC/MS) analysis on samples of different morphology. Annealed (more crystalline) samples exhibited greater chemical stability than freshly sublimed films, at the expense of photoluminescence efficiency. These phenomena are discussed with respect to possible failure mechanisms that Alq{sub 3}-based OLEDs might undergo during prolonged operation.
- Research Organization:
- Univ. of Connecticut, Storrs, CT (US)
- OSTI ID:
- 20034123
- Resource Relation:
- Conference: Electrical, Optical, and Magnetic Properties of Organic Solid-State Materials IV, Boston, MA, (US), 12/01/1997--12/05/1997; Other Information: PBD: 1998; Related Information: In: Electrical, optical, and magnetic properties of organic solid-state materials IV. Materials Research Society, symposium proceedings Volume 488, by Reynolds, J.R.; Jen, A.K.Y.; Rubner, M.F.; Chiang, L.Y.; Dalton, L.R. [eds.], 977 pages.
- Country of Publication:
- United States
- Language:
- English
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