| US 7,518,141 B2 | ||
| Multicolor organic light emitting apparatus | ||
| Naoto Nakamura, Isehara (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Mar. 27, 2007, as Appl. No. 11/691,682. | ||
| Claims priority of application No. 2006-090537 (JP), filed on Mar. 29, 2006; and application No. 2007-069971 (JP), filed on Mar. 19, 2007. | ||
| Prior Publication US 2007/0228367 A1, Oct. 04, 2007 | ||
| Int. Cl. H01L 35/24 (2006.01) | ||
| U.S. Cl. 257—40 [257/E51.018; 257/E51.022] | 40 Claims |
| 1. A multicolor organic light emitting apparatus of a top-emission type, comprising:
a substrate; and
a plurality of organic light emitting devices which is formed on the substrate and comprises a first organic light emitting
device for exhibiting a first luminescent color and a second organic light emitting device for exhibiting a second luminescent
color which is different from the first luminescent color, wherein:
the first organic light emitting device includes a light reflective cathode, an organic compound layer which contains a light
emitting layer having an electron transportability, and a light transmissive anode formed in the stated order from a side
of the substrate;
the second organic light emitting device includes a light reflective cathode, an organic compound layer containing a light
emitting layer which has an electron transportability and is formed with a material and a thickness different from those of
the light emitting layer of the first organic light emitting device, and a light transmissive anode formed in the stated order
from the side of the substrate;
a thickness of a layer formed between the light emitting layer and a reflection surface of the cathode is the same as that
of each of the first organic light emitting device and the second organic light emitting device; and
an optical distance between a light emitting surface of each of the light emitting layers and the reflection surface of the
cathode is adjusted such that each thickness of the light emitting layers is varied to enhance light emitted from the light
emitting layers by optical interference.
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