OLEDs containing thermally stable asymmetric charge carrier materials
US6242115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1997 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Sep 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31504
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Organic light emitting devices are comprised of an organic charge carrier layer formed from a charge carrier material that is capable of forming a stable glass due to the presence of a compound having an asymmetric molecular structure in the charge carrier material. For example, the OLED may contain hole transporting layers comprised of compounds having an asymmetric molecular structure in which hole transporting substituents are asymmetrically located around a core atom or core chemical group. The core atom may be a nitrogen atom or the core chemical group may be comprised of a single phenylene group or a biphenylene group which is substituted with at least two hole transporting amine groups, wherein at least one of the amine groups is different from at least one other amine group. For example, the compound may have the asymmetric molecular structure as shown by formula I: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are, independently of one another, hole transporting amine groups, or hydrogen, with the proviso that at least two amine groups are present and at least one of the amine groups is different from at least one other amine group. Typically, R.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.