Importance

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Abstract

The light-emitting device has a substrate, an anode, an organic light-emitting layer, a cathode, a first and second gratings (optical sections). The first grating has a one-dimensional periodic refractive index distribution in the X direction and is capable of forming a photonic band gap. The second grating has a one-dimensional periodic refractive index distribution in the Y direction and is capable of forming a photonic band gap. A defect section is provided either for the first or second grating. This defect section is designed so that the energy level caused by the defect in within a prescribed emission spectrum. The organic light-emitting layer can emit light by electrically pumping, and an electric field is produced by the anode and cathode. The light-emitting device utilizes a two-dimensional photonic band gap and produces light with an extremely narrow spectral width at very high efficiency.

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First Claim