Organic light-emitting diode with microcavity including...

H - Electricity – 01 – L

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H01L 51/52 (2006.01) H01L 51/50 (2006.01)

Patent

CA 2712251

An organic light emitting diode (OLED) emitting light downward through a transparent substrate (240) is de-scribed. The OLED embeds a microcavity (220) formed between a cathode (210) and an anode (230) and includes a plurality of organic layers comprising a light emitting layer (225). It is characterized in that the plurality of organic layers includes at least a first layer (229) made of an organic doped material aimed at enhancing the transport of holes; the plurality of organic layers also includes at least a second layer (221) made of an organic doped material aimed at enhancing the transport of electrons. The OLED is further characterized in that the anode i (230) is obtained by deposition of a semi transparent layer of silver (Ag) over the trans-parent substrate to be directly in contact with the first doped organic layer (229). Then, thicknesses of the first and second doped organic layers can be freely adapted to best adjust the optical characteristics of the microcavity for the wavelength of monochromatic light to be produced by the OLED.

L'invention porte sur une diode électroluminescente organique (DELO) émettant de la lumière vers le bas à travers un substrat transparent (240). La DELO incorpore une microcavité (220) formée entre une cathode (210) et une anode (230) et comprend une pluralité de couches organiques comprenant une couche électroluminescente (225). La DELO est caractérisée en ce que la pluralité de couches organiques comprend au moins une première couche (229) constituée d'un matériau dopé organique destiné à améliorer le transport de trous; la pluralité de couches organiques comprend également au moins une seconde couche (221) constituée d'un matériau dopé organique destiné à améliorer le transport d'électrons. La DELO est en outre caractérisée en ce que l'anode (230) est obtenue par dépôt d'une couche semi-transparente d'argent (Ag) sur le substrat transparent pour être directement en contact avec la première couche organique dopée (229). Les épaisseurs des première et seconde couches organiques dopées peuvent alors être librement adaptées pour ajuster au mieux les caractéristiques optiques de la microcavité pour la longueur d'onde de lumière monochromatique devant être produite par la DELO.

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