The present invention is related to a kind of light emitting apparatus, which is composed of a piece of printed circuit board and a light-emitting device having the organic material coating layer. The light-emitting device is provided with at least one electron and/or hole carrier transport layer manufactured by one kind of organic material (5, 9, 25, 29, 45, 49) and one light-emitting layer manufactured by the organic material (7, 27, 47). The light-emitting device has the feature that the organic layer structure is disposed on one piece of printed circuit board that is used as the substrate, and is at least provided with one doped transport layer for improving the injection of electrons and/or holes. Additionally, the electron or hole injection transport layers (3, 23, 43) and the level and smooth layers (4, 24) for improving the electron or hole injection of the substrate are disposed.