Micro-optical resonator type organic electroluminescent device
First Claim
1. A micro-optical resonator organic electroluminescent device comprising:
- a multi-layered mirror having two alternately laminated layers with different refractive indexes;
a transparent conductive layer as an anode formed on said multi-layered mirror;
an organic compound layer of a single layer or a plurality of layers formed on said transparent conductive layer; and
a metal mirror, as a cathode, capable of reflecting light, said multi-layered mirror and said metal mirror forming a micro-optical resonator for enhancing light output from said organic compound layer,wherein an optical length L of the micro-optical resonator is such that radiation from the micro-optical resonator has a single mode spectrum free of low mode components, said optical length L of said micro-optical resonator is given by the equation set forth below which takes into account the penetration depth of light into the inside of said multi-layered mirror, ##EQU3## where λ
is the wavelength of a resonating light, neff is the effective refractive index of the multi-layered mirror, Δ
n is in the difference of the refractive indexes of the two layers in the multi-layered mirror, ni and di are the refractive index and the total thickness of the organic compound and the transparent conductive layer, and θ
is the angle of the light incident on an interface between organic compound layers or between an organic compound layer and a transparent conductive layer, with respect to the normal to the interface, wherein the optical length L is 1.5 times a required emission wavelength.
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Abstract
A micro-optical resonator type organic electroluminescent device utilizing an organic electroluminescent material high in emission efficiency but broad in emission spectrum width, has a narrow half bandwidth in the emission peak and a superior forward directivity and an excellent monochromaticity in light not separate into components, wherein a micro-optical resonator is formed by a multi-layered mirror and a metal mirror. The optical length of the micro-optical resonator, calculated from the total thickness and the refractive index of a transparent conductive layer and a luminous layer placed between the multi-layered mirror and the metal mirror and also from the light penetration depth into the multi-layered mirror, is 1.5 times the wavelength of a desired light emitted from the device, and the desired light is set on the short wavelength side of the emission spectrum of the electroluminescent material.
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Citations
12 Claims
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1. A micro-optical resonator organic electroluminescent device comprising:
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a multi-layered mirror having two alternately laminated layers with different refractive indexes; a transparent conductive layer as an anode formed on said multi-layered mirror; an organic compound layer of a single layer or a plurality of layers formed on said transparent conductive layer; and a metal mirror, as a cathode, capable of reflecting light, said multi-layered mirror and said metal mirror forming a micro-optical resonator for enhancing light output from said organic compound layer, wherein an optical length L of the micro-optical resonator is such that radiation from the micro-optical resonator has a single mode spectrum free of low mode components, said optical length L of said micro-optical resonator is given by the equation set forth below which takes into account the penetration depth of light into the inside of said multi-layered mirror, ##EQU3## where λ
is the wavelength of a resonating light, neff is the effective refractive index of the multi-layered mirror, Δ
n is in the difference of the refractive indexes of the two layers in the multi-layered mirror, ni and di are the refractive index and the total thickness of the organic compound and the transparent conductive layer, and θ
is the angle of the light incident on an interface between organic compound layers or between an organic compound layer and a transparent conductive layer, with respect to the normal to the interface, wherein the optical length L is 1.5 times a required emission wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A micro-optical resonator organic electroluminescent device comprising:
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a multi-layered mirror having two alternately laminated layers with different refractive indexes; a transparent conductive layer as an anode formed on said multi-layered mirror; an organic compound layer of a single layer or a plurality of layers formed on said transparent conductive layer; and a metal mirror, as a cathode, capable of reflecting light, said multi-layered mirror and said metal mirror forming a micro-optical resonator for enhancing light output from said organic compound layer, wherein an optical length L of the micro-optical resonator is such that radiation from the micro-optical resonator has a single mode spectrum free of low mode components, said optical length L of said micro-optical resonator is given by the equation set forth below which takes into account the penetration depth of light into the inside of said multi-layered mirror, ##EQU4## where λ
is the wavelength of a resonating light, neff is the effective refractive index of the multi-layered mirror, Δ
n is in the difference of the refractive indexes of the two layers in the multi-layered mirror, ni and di are the refractive index and the total thickness of the organic compound and the transparent conductive layer, and θ
is the angle of the light incident on an interface between organic compound layers or between an organic compound layer and a transparent conductive layer, with respect to the normal to the interface, wherein the optical length L is 1.5 times a required emission wavelength, and wherein the required emission wavelength is in a range from (λ
m-10) nm to (λ
m-50) nm.
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Specification