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Chemical and morphological stability of aluminum tris(8-hydroxyquinoline) (Alq3): effects in light-emitting devices

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3 Author(s)
Papadimitrakopoulos, Fotios ; Dept. of Chem., Connecticut Univ., Storrs, CT, USA ; Xian-Man Zhang ; Higginson, Keith A.

Aluminum tris(8-hydroxyquinoline) (Alq3) is presently considered one of the most reliable electron transporting and emitting materials for molecular-based organic light-emitting diodes (OLEDs). This paper summarizes the investigations that our group, over the past three years, have conducted into the physical and chemical response of Alq3 in the presence of small amounts of moisture. The characteristic evolution of 8-hydroxyquinoline (8-Hq), a volatile byproduct of the hydrolysis of Alq3, was quantified using thermogravimetric and gas chromatography/mass spectroscopy (GC/MS) analysis as a function of sample morphology. Annealed (more crystalline) samples exhibited greater stability to hydrolysis than freshly sublimed films, at the expense of photoluminescence (PL) efficiency. These phenomena are discussed with respect to failure mechanisms observed in Alq3-based OLEDs

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:4 ,  Issue: 1 )