Organic electroluminescent device with stabilizing fused metal particle cathode
First Claim
Patent Images
1. An organic electroluminescent device comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode consisting essentially of a plurality of metals other than alkali metals, at least one of said metals having a work function less than that of indium,characterized in that said cathode is comprised of a layer of fused metal particles containing at least 80 percent indium and having a mean diameter of less than 1 μ
- m and a coefficient of variation of less than 20 percent.
2 Assignments
0 Petitions
Accused Products
Abstract
An organic electroluminescent device is disclosed which is protected from dark spot formation. The device is comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode. The cathode is comprised of an electron injecting layer contacting the organic electroluminescent medium containing a plurality of metals at least one of which has a work function of less than that of indium. The cathode is comprised of a layer of fused metal particles containing at least 80 percent of indium and having a mean diameter of less the 1 μm and a coefficient of variation of less than 20 percent.
-
Citations
18 Claims
-
1. An organic electroluminescent device comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode consisting essentially of a plurality of metals other than alkali metals, at least one of said metals having a work function less than that of indium,
characterized in that said cathode is comprised of a layer of fused metal particles containing at least 80 percent indium and having a mean diameter of less than 1 μ - m and a coefficient of variation of less than 20 percent.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
13. An organic electroluminescent device comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode consisting essentially of a plurality of metals other than alkali metals, at least one of said metals having a work function less than that of indium,
characterized in that said cathode is comprised of an electron injecting layer contacting said organic electroluminescent medium and containing at least one metal having a work function less than that of indium and, overlying said injecting layer, a capping layer of fused metal particles containing at least 80 percent indium and free of metal having a lower work function than indium, the particles having a mean diameter of less than 1 μ - m and a coefficient of variation of less than 20 percent.
- View Dependent Claims (14, 15)
-
16. An organic electroluminescent device comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode consisting essentially of a plurality of metals other than alkali metals, at least one of said metals having a work function less than that of indium,
characterized in that said cathode is comprised of an electron injecting layer containing at least one metal having a work function less than that of indium contacting said organic electroluminescent medium and overlying said electron injecting layer a fused metal particle capping layer which consists essentially of indium, said metal particles having a mean diameter of less than 1 μ - m and a coefficient of variation of less than 20 percent.
-
17. An organic electroluminescent device comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode consisting essentially of a plurality of metals other than alkali metals, at least one of said metals having a work function less than that of indium,
characterized in that said cathode is comprised of an electron injecting layer contacting said organic electroluminescent medium, said electron injecting layer consisting essentially of magnesium and at least one other metal having a higher work function than magnesium, and a fused metal particle capping layer overlying said electron injecting layer, said metal particles containing at least 80 percent indium and having a mean diameter of less than 1 μ - m and a coefficient of variation of less than 20 percent.
-
18. An organic electroluminescent device comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode consisting essentially of a plurality of metals other than alkali metals, at least one of said metals having a work function less than that of indium,
characterized in that said cathode is comprised of an electron injecting layer contacting said organic electroluminescent medium, said electron injecting layer consisting essentially of magnesium and at least one of silver and aluminum and a fused metal particle capping layer overlying said electron injecting layer, said metal particles containing at least 80 percent indium and having a means diameter of less than 1 μ - m and a coefficient of variation of less than 20 percent.
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeGlobal OLED Technology LLC (LG Display Co., Ltd.)
-
Original AssigneeEastman Kodak Company
-
InventorsTang, Ching W., Scozzafava, Michael, Littman, Jon E.
-
Primary Examiner(s)Seidleck, James J.
-
Application NumberUS07/557,857Time in Patent Office509 DaysField of Search313/503, 313/504, 428/690, 428/917, 428/323, 428/330US Class Current428/323CPC Class CodesH01B 1/02 mainly consisting of metals...H05B 33/14 characterised by the chemic...H05B 33/26 characterised by the compos...H10K 50/82 CathodesH10K 50/826 Multilayers, e.g. opaque mu...Y10S 428/917 ElectroluminescentY10T 428/25 Web or sheet containing str...Y10T 428/258 Alkali metal or alkaline ea...
