Method for preparation of conjugated arylene and hetroarylene vinylene polymers
US5621069A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1995 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Sep 15, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K85/114
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A technique is described for the preparation of conjugated arylene and heteroarylene vinylene polymers by thermal conversion of a polymer precursor prepared by reacting an aromatic ring structure with an aqueous solution of an alkyl xanthic acid potassium salt. In this processing sequence the xanthate group acts as a leaving group and permits the formation of a prepolymer which is soluble in common organic solvents. Conversion of the prepolymer is effected at a temperature ranging from 150.degree.-250.degree. C. in the presence of forming gas. Studies have shown that electroluminescent devices prepared in accordance with the described technique evidence internal quantum efficiencies superior to those of the prior art due to the presence of pinhole free films and therefore permit the fabrication of larger area LED's than those prepared by conventional techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.