Ultra-thin alkaline earth metals as stable electron-injecting electrodes for polymer light emitting diodes
US6452218B1 · kind B1 · utility
17Cited by
14References
84Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1997 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Feb 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K50/826
Abstract
This invention pertains generally to the field of light-emitting diodes (LEDs). More particularly, this invention relates to polymer LEDs which offer high brightness, high efficiency and extended operating life, and which comprise (a) a transparent hole-injecting anode layer; (b) an emissive layer comprising an electroluminescent polymer; and, (c) an electron-injecting cathode layer; wherein said cathode layer comprises an ultra-thin layer of alkaline earth metal (such as calcium, strontium and barium) having a thickness of about 100 å or less, typically from about 15 to about 100 å.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.