U.S. Philips Corporation

Robert J Demandt

Aemilianus G Staring

Dirk Jan Broer

Coen T Liedenbaum

Hermannus F Schoo

Jeroen J Vleggaar

Adrianus J Berntsen

Hermanus F Schoo

An organic electroluminescent device and a method of manufacturing such a device. By patterned exposure of an alkylatable-compound-containing organic layer of the device to an alkylating agent, a device is obtained which, in operation, exhibits patterned light emission, without it being necessary to structure the electrode layers. A salt is locally formed by means of alkylating in accordance with a pattern. If the salt contains ions which can move under the influence of an electric field, the threshold voltage necessary to produce light emission is reduced.

Organic electroluminescent device

A description is given of a method of providing an electroluminescent device (20) comprising an active layer (5) of conjugated 2,5-alkyl- or alkoxy-substituted poly(p-phenylene vinylene) with inactive regions (51) and emissive regions (52) by means of patterned irradiation with UV light. Both regions (51) and (52) of the active layer (5) show a clear difference in electroluminescence, electrical resistance and solubility. By means of the above-described effects, displays can be manufactured without making use of structured electrode layers (3) and (11).

Electroluminescent device

A conjugated poly(p-phenylene vinylene) is manufactured by means of CVD and using simple monomers. Such a polymer is particularly adaptable for use as an active layer in electroluminescent devices, such as a light-emitting diode.

CVD method of providing a film of conjugated, substituted or

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Eindhoven, Netherlands

Robert J Demandt