Abstract: Provided is a PIN type organic light emitting diode that includes a first electrode of a first electrode type, a first transport layer of a first type of charge carrier, an emission layer, a second transport layer of a second type of charge carrier, and a second electrode of a second type of electrode. At least one of the transport layers includes at least two elementary transport layers and each elementary transport layer of the same transport layer has, in relation to an adjacent elementary transport layer, a decreasing mobility of charge carriers a farther distance from the emission layer, and consequently providing a decreasing conductivity based on a distance of the elementary transport layer from the adjacent electrode, with the elementary transport layers of the same transport layer having the same dopant concentration.

Abstract: Provided is a PIN type organic light emitting diode that includes a first electrode of a first electrode type, a first transport layer of a first type of charge carrier, an emission layer, a second transport layer of a second type of charge carrier, and a second electrode of a second type of electrode. At least one of the transport layers includes at least two elementary transport layers and each elementary transport layer of the same transport layer has, in relation to an adjacent elementary transport layer, a mobility of charge carriers corresponding to a decreasing transport layer and consequently providing a decreasing conductivity based on a distance of the elementary transport layer from the adjacent electrode, with the elementary transport layers of the same transport layer having the same dopant concentration.

Abstract: An organic light-emitting diode (OLED) on a transparent substrate includes a microcavity formed between a reflecting cathode and semi-reflecting anode. The microcavity includes multiple organic layers with at least one light-emitting layer. The OLED is characterized by a transparent planarization layer between the substrate and an upper metallic layer forming the OLED semitransparent anode. A process for making such an OLED is also described.

Abstract: An organic light-emitting diode (OLED) on a transparent substrate includes a microcavity formed between a reflecting cathode and semi-reflecting anode. The microcavity includes multiple organic layers with at least one light-emitting layer. The OLED is characterized by a transparent planarization layer between the substrate and an upper metallic layer forming the OLED semitransparent anode. A process for making such an OLED is also described.