An organic light emitting device having a sequence comprising: a cathode; a layer including an organic electroluminescent material; a layer including a hole transport material; a layer including an electron accepting material, selected from the group consisting of: tetracyanoquinodimethane compounds; thiopyranylidine compounds; polynitrofluorenone compounds; tetracyanoethylene compounds; chloranil compounds; carboxylfluorenone malonitrile compounds; N,N'bis(dialkyl)-1,4,5,8-naphthalenetetracarboxylic diimide compounds; N,N'bis(diaryl)-1,4,5,8-naphthalenetetracarboxylic diimide compounds; carboxybenzylnaphthaquinone compounds; diphenoquionone compounds, inorganic Lewis acid compounds, and fullerene compounds, and a mixture thereof; an anode capping layer consisting of Mg, a stack of Au:Pd/NPB+Mg(1:1), CuPc+Mg(1:1), a stack of Mg/CuPc, a stack of Mg/NPB/Mg or NPB+Mg(1:1); an anode; and a substrate in the sequence before the cathode or after the anode, wherein the layer including an electron accepting material is disposed between the layer including a hole transport material and the anode capping layer, wherein the anode capping layer is selected to provide the device with a luminance stability ratio that is greater than 1, wherein the luminance stability ratio refers to the ratio between the time of operation elapsed before the luminance of the device containing the anode capping layer drops by a certain factor of the initial luminance L 0, and the time of operation elapsed before the luminance of a comparison device, which is in all respects identical except for the absence of the anode capping layer, drops by the same factor when operated at the same initial luminance L 0, under the same testing a cathode; a layer including an organic electroluminescent material; a layer including a hole transport material; a layer including an electron accepting material, selected from the group consisting of: tetracyanoquinodimethane compounds; thiopyranylidine compounds; polynitrofluorenone compounds; tetracyanoethylene compounds; chloranil compounds; carboxylfluorenone malonitrile compounds; N,N'bis(dialkyl)-1,4,5,8-naphthalenetetracarboxylic diimide compounds; N,N'bis(diaryl)-1,4,5,8-naphthalenetetracarboxylic diimide compounds; carboxybenzylnaphthaquinone compounds; diphenoquionone compounds, inorganic Lewis acid compounds, and fullerene compounds, and a mixture thereof; an anode capping layer consisting of Mg, a stack of Au:Pd/NPB+Mg(1:1), CuPc+Mg(1:1), a stack of Mg/CuPc, a stack of Mg/NPB/Mg or NPB+Mg(1:1); an anode; and a substrate in the sequence before the cathode or after the anode, wherein the layer including an electron accepting material is disposed between the layer including a hole transport material and the anode capping layer, wherein the anode capping layer is selected to provide the device with a luminance stability ratio that is greater than 1, wherein the luminance stability ratio refers to the ratio between the time of operation elapsed before the luminance of the device containing the anode capping layer drops by a certain factor of the initial luminance L 0, and the time of operation elapsed before the luminance of a comparison device, which is in all respects identical except for the absence of the anode capping layer, drops by the same factor when operated at the same initial luminance L 0, under the same testing tetracyanoquinodimethane compounds; thiopyranylidine compounds; polynitrofluorenone compounds; tetracyanoethylene compounds; chloranil compounds; carboxylfluorenone malonitrile compounds; N,N'bis(dialkyl)-1,4,5,8-naphthalenetetracarboxylic diimide compounds; N,N'bis(diaryl)-1,4,5,8-naphthalenetetracarboxylic diimide compounds; carboxybenzylnaphthaquinone compounds; diphenoquionone compounds, inorganic Lewis acid compounds, and fullerene compounds, and a mixture thereof; an anode capping layer consisting of Mg, a stack of Au:Pd/NPB+Mg(1:1), CuPc+Mg(1:1), a stack of Mg/CuPc, a stack of Mg/NPB/Mg or NPB+Mg(1:1); an anode; and a substrate in the sequence before the cathode or after the anode, wherein the layer including an electron accepting material is disposed between the layer including a hole transport material and the anode capping layer, wherein the anode capping layer is selected to provide the device with a luminance stability ratio that is greater than 1, wherein the luminance stability ratio refers to the ratio between the time of operation elapsed before the luminance of the device containing the anode capping layer drops by a certain factor of the initial luminance L 0, and the time of operation elapsed before the luminance of a comparison device, which is in all respects identical except for the absence of the anode capping layer, drops by the same factor when operated at the same initial luminance L 0, under the same testing the time of operation elapsed before the luminance of the device containing the anode capping layer drops by a certain factor of the initial luminance L 0, and the time of operation elapsed before the luminance of a comparison device, which is in all respects identical except for the absence of the anode capping layer, drops by the same factor when operated at the same initial luminance L 0, under the same testing