Polymer,method of its preparation, and electronic device
AssigneeKoninklijke Philips Electronics N.V.
InventorsPaulus Cornelis Duineveld, Margaretha Maria De Kok-Van Breemen, Priscilla Amber Majella Lips, Jochem Petrus Maria De Koning, Cornelis Dirk Roelandse
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Abstract
A polymer comprising structural units of the formula I has a number average molecular weight of less than 300.103 g/mole and a weight average molecular weight of less than 500.103 g/mole. A preferred example is a polyphenylene-vinylene. A composition of this polymer can be deposited on a substrate by means of inkjet printing excellently. This can be used for the manufacture of electroluminescent devices, in particular multicolor electroluminescent devices. 1
Claims11
A polymer with structural units in accordance with formula I,
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- in which
- Ar is an aromatic cyclic system with 4 to 20 carbon atoms with optionally a single or multiple substitution with a group chosen from a non-branched C1-C20-alkyl, C3-C20-alkoxy, C1-C20-alkylsulphate, a branched C3-C20-alkyl, phenyl, or benzyl group, and which may optionally comprise up to 4 hetero atoms chosen from the group comprising oxygen, sulfur, and nitrogen in the aromatic cyclic system,
- R2 and R″2 are chosen from the group comprising a hydrogen atom and a C1-C20-alkyl and a C4-C20-aryl group, which groups may optionally comprise substituents,
- characterized in that the polymer has a number average molecular weight which is below 300.103 g/mole, and in that the polymer has a weight average molecular weight which is below 500.103 g/mole.
A composition comprising a solvent and a polymer as claimed in any one of the preceding claims.
A method of preparing polymers defined by the formula I, a composition of which polymers can be provided on a substrate by means of ink jet printing,
- which method comprises the steps of:
- preparing the polymers with a number average molecular weight of more than 300.103 g/mole, and
- an ultrasonic aftertreatment in which the number average molecular weight drops to below 300.103 g/mole.
An electronic device provided with a patterned layer comprising a polymer with structural units of the formula I on a substrate,
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- in which
- Ar is an aromatic cyclic system with 4 to 20 carbon atoms with optionally a single or multiple substitution with a group chosen from a non-branched C1-C20-alkyl, C3-C20-alkoxy, C1-C20-alkylsulphate, a branched C3-C20-alkyl, phenyl, or benzyl group, and which may optionally comprise up to 4 hetero atoms chosen from the group comprising oxygen, sulfur, and nitrogen in the aromatic cyclic system,
- R2 and R″2 are chosen from the group comprising a hydrogen atom and a C1-C20-alkyl and a C4-C20-aryl group, which groups may optionally comprise substituents,
- characterized in that the polymer has a number average molecular weight which is below 300.103 g/mole, and in that the polymer has a weight average molecular weight which is below 500.103 g/mole.
Dependencies are inferred from the claim text.