Electron and hole modulating electrodes in organic light emitting diodes
AssigneeOrganic Lighting Technologies LLC
InventorsMunisamy Anandan, Ed Sundaram Ramakrishnan
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Abstract
An efficient organic light emitting diode (OLED) device—incorporating a stack of thin films comprising a cathode, electron transport layer, hole modulating conductive layer, host layer, electron modulating conductive layer, hole transport layer, hole injection layer and a transparent anode layer—has increased recombination efficiency to generate substantial amount of light. The electron modulating electrode and hole modulating electrode embedded in the stack are applied with appropriate electrical bias to contain the electrons and holes respectively inside the host layer to enhance recombination and consequently light output.
Claims19
An efficient organic light emitting diode device comprising:
- a stack of thin film organic layers and metal layers;
- said thin film layers further comprising a cathode layer followed by an electron transport layer followed by a hole modulating conductive layer followed by a fluorescent or phosphorescent doped light emitting host layer followed by an electron modulating conductive layer followed by a hole transport layer followed by a hole injection layer followed by an anode layer and finally followed by a thick transparent substrate, all remaining in intimate contact with each other;
- said stack hermetically sealed;
- means for externally connecting and applying voltage to said anode, cathode, electron modulating conductive layer and hole modulating conductive layer;
- said electron modulating conductive layer functioning as electron modulating electrode, preventing electrons from leaving the light emitting host layer;
- said hole modulating conductive layer functioning as hole modulating electrode, preventing holes from leaving the light emitting host layer;
- said electron modulating electrode, hole modulating electrode, cathode and anode with suitable voltages generating light efficiently in the host layer.
A backlight device for a liquid crystal display having an efficient organic light emitting diode comprising:
- a stack of thin film organic layers and metal layers;
- said thin film layers further comprising a cathode layer followed by an electron transport layer followed by a hole modulating conductive layer followed by a fluorescent or phosphorescent doped light emitting host layer followed by an electron modulating conductive layer followed by a hole transport layer followed by a hole injection layer followed by an anode layer and finally followed by a thick transparent substrate, all remaining in intimate contact with each other;
- said stack hermetically sealed;
- means for externally connecting and applying voltage to said anode, cathode, electron modulating conductive layer and hole modulating conductive layer;
- said electron modulating conductive layer functioning as electron modulating electrode, preventing electrons from leaving the light emitting host layer;
- said hole modulating conductive layer functioning as hole modulating electrode, preventing holes from leaving the light emitting host layer;
- said electron modulating electrode, hole modulating electrode, cathode and anode with suitable voltages generating light efficiently in the host layer.
A light source for consumer lighting having efficient organic light emitting diode comprising:
- a stack of thin film organic layers and metal layers;
- said thin film layers further comprising a cathode layer followed by an electron transport layer followed by a hole modulating conductive layer followed by a fluorescent or phosphorescent doped light emitting host layer followed by an electron modulating conductive layer followed by a hole transport layer followed by a hole injection layer followed by an anode layer and finally followed by a thick transparent substrate, all remaining in intimate contact with each other;
- said stack hermetically sealed;
- means for externally connecting and applying voltage to said anode, cathode, electron modulating conductive layer and hole modulating conductive layer;
- said electron modulating conductive layer functioning as electron modulating electrode, preventing electrons from leaving the light emitting host layer;
- said hole modulating conductive layer functioning as hole modulating electrode, preventing holes from leaving the light emitting host layer;
- said electron modulating electrode, hole modulating electrode, cathode and anode with suitable voltages generating light efficiently in the host layer.
Dependencies are inferred from the claim text.