| abstract |
An organic electroluminescence device in which the following total optical thickness is set at a value which enhances the intensity of the central wave length lambda ( lambda being selected in the ranges of 440 to 490 nm, 500 to 550 nm, and 600 to 650 nm) of the electroluminescence light emitted from the organic multi-layer part having a refractive index of 1.6 to 1.8: (1) in the construction of a substrate/a transparent electrode of a high refractivity/an organic multi-layer part/a cathode, the total optical thickness of the transparent electrode of a high refractivity and the organic multi-layer part; (2) in the construction of a substrate/an underlayer of a high refractivity/a transparent electrode/an organic multi-layer part/a cathode, the total optical thickness of the underlayer of a high refractivity, the transparent electrode, and the organic multi-layer part or the total optical thickness of the transparent electrode and the organic multi-layer part; and (3) in the construction of a substrate/a underlayer of a low refractivity/a transparent electrode/an organic multi-layer part/a cathode, the total optical thickness of the transparent electrode and the organic multi-layer part. The device has a simple construction and the color purity of the blue light emission is particularly increased. |