Organic electroluminescence device, planar light source and display device using the same
First Claim
1. An organic electroluminescence device comprising at least one organic layer and a pair of electrodes, said organic layer including an emitting layer being sandwiched between said pair of electrodes, said pair of electrodes being provided as a reflective electrode and a transparent electrode respectively, said organic electroluminescence device being formed to satisfy the expression (1) :
- B0<
Bθ
in which B0 is a normal luminance intensity of luminescence radiated from a light extraction surface to an observer side, and Bθ
is a luminance intensity of said luminescence at an angle of 50°
to 70°
, wherein a region for disturbing an angle of reflection/refraction of light is provided in an optical path in which the luminescence is output from said emitting layer to the observer side through said transparent electrode;
at least one kind of luminescent material is contained in said region or between said region and said emitting layer so that said luminescent material generates fluorescence or phosphorescence when said luminescent material absorbs the luminescence radiated from said emitting layer as an excitation light source.
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Accused Products
Abstract
An organic EL cell is formed to satisfy the expression (1): B0<Bθ in which B0 is a normal luminance intensity of luminescence radiated from a light extraction surface to an observer side, and Bθ is aluminance intensity of the luminescence at an angle of 50° to 70°. A region for disturbing an angle of reflection/refraction of light is provided in an optical path in which the luminescence is output from said emitting layer to the observer side through said transparent electrode. As the region, an anisotropic scattering resin layer containing a light-transmissive resin, and micro domains dispersed/distributed in the light-transmissive resin and different in birefringence characteristic may be formed substantially without interposition of any air layer in an optical path in which the luminescence is output from the emitting layer to the observer side through the transparent electrode. At least one kind of luminescent material is contained in the anisotropic scattering resin layer or between the anisotropic scattering resin layer and the emitting layer so that the luminescent material generates fluorescence or phosphorescence when the luminescent material absorbs the luminescence radiated from the emitting layer as an excitation light source.
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Citations
14 Claims
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1. An organic electroluminescence device comprising at least one organic layer and a pair of electrodes, said organic layer including an emitting layer being sandwiched between said pair of electrodes, said pair of electrodes being provided as a reflective electrode and a transparent electrode respectively, said organic electroluminescence device being formed to satisfy the expression (1) :
- B0<
Bθ
in which B0 is a normal luminance intensity of luminescence radiated from a light extraction surface to an observer side, and Bθ
is a luminance intensity of said luminescence at an angle of 50°
to 70°
,wherein a region for disturbing an angle of reflection/refraction of light is provided in an optical path in which the luminescence is output from said emitting layer to the observer side through said transparent electrode;
at least one kind of luminescent material is contained in said region or between said region and said emitting layer so that said luminescent material generates fluorescence or phosphorescence when said luminescent material absorbs the luminescence radiated from said emitting layer as an excitation light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- B0<
Specification