Polymer light emitting device
US6403236B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1998 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Sep 1, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24942
Abstract
A polymer light emitting device at least having a light emitting layer containing a polymeric fluorescent substance and a charge transporting layer, wherein said polymeric fluorescent substance contains one or more kind of repeating units represented by the following formula (1),—Ar1—CR1═CR2—  (1)and said charge transporting layer contains an organic compound satisfying the following conditions 1 and 2 in an amount of from 1 to 70% by weightEOX2−0.15≦EOX1≦EOX2+0.10  (condition 1)&lgr;edge2−30≦&lgr;edge1≦&lgr;edge2+20  (condition 2)(wherein EOX1 and &lgr;edge1 respectively represent an electrochemically determined oxidation potential and an absorption edge wavelength of an absorption spectrum of said organic compound; EOX2 and &lgr;edge2 respectively represent an electrochemically determined oxidation potential and an absorption edge wavelength of an absorption spectrum of said polymeric fluorescent substance used in said light emitting layer; and the unit in the condition 1 is V and the unit in the condition 2 is nm). The polymer light emitting device has a long and excellent stability on driving.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.