Invention Application
- Patent Title: ORGANIC ELECTRONIC LIGHTING SYSTEM
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Application No.: US15322371Application Date: 2015-06-19
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Publication No.: US20170150573A1Publication Date: 2017-05-25
- Inventor: Natasha M.J. Conway , Colin Baker , Philip Benzie , Alexander Doust , Niall MacCarthy
- Applicant: Cambridge Display Technology Limited
- Applicant Address: JP Godmanchester
- Assignee: Cambridge Display Technology Limited
- Current Assignee: Cambridge Display Technology Limited
- Current Assignee Address: JP Godmanchester
- Priority: GB1411493.8 20140627
- International Application: PCT/EP2015/063835 WO 20150619
- Main IPC: H05B33/08
- IPC: H05B33/08 ; H01L51/52 ; H01L27/32 ; H01L51/50

Abstract:
A method of increasing the lifetime of an ITO-free organic lighting system comprises: providing an organic lighting element having a substrate (12) bearing a set of anode electrode metal tracks (14), a conductive organic layer (16) over said metal tracks, an organic light emitting layer (18) over said conductive organic layer, and a cathode electrode layer (20) over said organic light emitting layer, wherein said metal comprises copper, and wherein said conductive organic layer comprises a doped conducting polymer, and driving the organic lighting element with a pulsed current drive. A biphasic pulse is employed having a first, on-phase with a defined current drive and a second, off-phase with a drive having a defined potential difference of zero volts across the lighting element. The anode electrode metal may have a higher work function than the cathode electrode layer. During said zero level drive portion the different work functions provide a reverse bias electric field within the organic lighting element.
Information query