Electrical field induced ageing of polymer light-emitting diodes in an oxygen-rich atmosphere studied by emission microscopy, scanning electron microscopy and secondary ion mass spectroscopy
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- Authors:
- BIJNENS, W
DE WOLF, I
DE CEUNINCK, W
DE SCHEPPER, L
STALS, L. M
MANCA, J
D'HAEN, J
WU, T. D
D'OLIESLAEGER, M
BEYNE, E
KIEBOOMS, R
VANDERZANDE, D
GELAN, J - Author Affiliations:
- Institute for Materials Research, Chemistry Division, Universitaire Campus Gebouw D, 3590 Diepenbeek, Belgium
IMEC, Kapeldreef 75, 3001 Leuven, Belgium
Institute for Materials Research, Material Physics Division, Wetenschapspark 1, 3590 Diepenbeek, Belgium - Source:
- Synthetic metals. 96(2):87-96
- Publication Date:
- 1998-01-01
- Language:
- English
- Abstract:
- Polymer light-emitting diodes (PLEDs) made with poly(p-phenylene vinylene) (PPV) using a non-ionic precursor route with indium-tin oxide (ITO) as anode and Al as cathode have been examined during continuous electrical stress in an oxygen-rich atmosphere. Three distinct regions in the time evolution of the equivalent electrical resistance and the light output of PLEDs are identified. Various electrical and analytical measurement results are presented to explain the main failure mechanisms. The most severe degradation mode can be identified as dielectric breakdown, resulting in 'hot spots' and ohmic leakage paths. The inhibition of the ohmic path formation by oxidation under ambient conditions results in a local delamination of the electrode, shrinking the active area of the device. This loss of active area caused by these oxidative burn-outs can clearly be observed by scanning electron microscopy ( SEM) and is consistent with secondary ion mass spectroscopy (SIMS) results. Emission microscopy (EMMI) inspection provides evidence for electric field induced ageing at defects present in the device. These defects are already present in the as-produced samples, e.g. particle impurities, interface roughness and structural weakness (edges of the Al electrodes).
- Notes:
- Electronics<br><br>Polymer industry, paints, wood
- Subjects:
- Electronics
Electronique
Condensed state physics
Physique de l'état condensé
Polymers, paint and wood industries
Polymères, industries des peintures et bois
Sciences exactes et technologie
Exact sciences and technology
Sciences appliquees
Applied sciences
Electronique
Electronics
Electronique des semiconducteurs. Microélectronique. Optoélectronique. Dispositifs à l'état solide
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Dispositifs optoélectroniques
Optoelectronic devices
Industrie des polymeres, peintures, bois
Polymer industry, paints, wood
Technologie des polymères
Technology of polymers
Domaines d'application
Application fields
Caractéristique temporelle
Time curve
Característica temporal
Caractéristique électrique
Electrical characteristic
Característica eléctrica
Diode électroluminescente
Light emitting diode
Diodo electroluminescente
Effet champ électrique
Electric field effect
Efecto campo eléctrico
Electroluminescence
Electroluminiscencia
Etude expérimentale
Experimental study
Estudio experimental
Mécanisme
Mechanism
Mecanismo
Phénylènevinylène polymère
Phenylenevinylene polymer
Fenilenovinileno polímero
Polymère conjugué
Conjugated polymer
Polímero conjugado
Vieillissement
Ageing
Envejecimiento - Format:
- Academic Journal
- Database:
- PASCAL Archive
- Journal:
- Synthetic metals
- Volume:
- 96
- Issue:
- 2
- Page Start:
- 87
- Page Count:
- 10
- ISSN:
- 03796779
- Publisher:
- Amsterdam; Lausanne; New York, NY: Elsevier Science, 1998.
- Document Type:
- Article
- Physical Description:
- print, 36 ref
