| 摘要 |
An organic electroluminescent device including: a light reflecting layer ( 1 ), a light semi-transmitting layer ( 3 ) and a light interference part ( 2 ) including an organic emitting layer, the part being formed between the light reflecting layer ( 1 ) and the light semi-transmitting layer ( 3 ); the spectrum of reflected light (B) having at least three minimum values in the wavelength region of 400 to 800 nm when light (A) having a wavelength of 400 to 800 nm enters from the light semi-transmitting layer ( 1 ). Incident light (A) is reflected in the light interference part (B) and undergoes optical interference effects. At this time, it is possible to cause the spectrum of light emitted to the outside to have a certain sharpened wavelength peak by adjusting the optical path length of the light interference part ( 2 ). As a result, the color purity is improved.
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