OLED device having improved light output
First Claim
1. A bottom-emitting organic light-emitting diode (OLED) device, comprising:
- a transparent substrate through which light is emitted;
an optical isolation cavity formed over the substrate having a refractive index lower than the refractive index of the substrate;
a transparent electrode formed over the optical isolation cavity;
one or more layers of organic light-emitting material formed over the transparent electrode;
a second electrode formed over the one or more layers of organic light-emitting material, said second electrode being reflective; and
a light-scattering layer formed over the optical isolation cavity;
wherein the transparent electrode or a second layer formed between the optical isolation cavity and the transparent electrode comprises one or more openings leading to the optical isolation cavity, and the cavity is formed by etching a sacrificial layer deposited between the substrate and the transparent electrode or the second layer through the one or more openings.
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Abstract
A bottom-emitting organic light-emitting diode (OLED) device, comprising: a transparent substrate; an optical isolation cavity formed over the substrate having a refractive index lower than the refractive index of the substrate; a transparent electrode formed over the optical isolation cavity; one or more layers of organic light-emitting material formed over the transparent electrode; a second electrode formed over the one or more layers of organic light-emitting material; and a light-scattering layer formed over the optical isolation cavity; wherein the transparent electrode or a second layer formed between the optical isolation cavity and the transparent electrode comprises one or more openings leading to the optical isolation cavity, and the cavity is formed by etching a sacrificial layer deposited between the substrate and the transparent electrode or the second layer through the one or more openings.
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Citations
16 Claims
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1. A bottom-emitting organic light-emitting diode (OLED) device, comprising:
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a transparent substrate through which light is emitted; an optical isolation cavity formed over the substrate having a refractive index lower than the refractive index of the substrate; a transparent electrode formed over the optical isolation cavity; one or more layers of organic light-emitting material formed over the transparent electrode; a second electrode formed over the one or more layers of organic light-emitting material, said second electrode being reflective; and a light-scattering layer formed over the optical isolation cavity; wherein the transparent electrode or a second layer formed between the optical isolation cavity and the transparent electrode comprises one or more openings leading to the optical isolation cavity, and the cavity is formed by etching a sacrificial layer deposited between the substrate and the transparent electrode or the second layer through the one or more openings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of making a bottom-emitting organic light-emitting diode (OLED) device, comprising:
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providing a transparent substrate through which light may be transmitted; forming a first sacrificial layer over the substrate; forming a second layer over the first sacrificial layer, the second layer being etchant resistant relative to the first sacrificial layer and having openings exposing portions of the first sacrificial layer; etching the sacrificial layer away through the openings in the second layer to form an optical isolation cavity over the substrate having a refractive index lower than the refractive index of the substrate; forming a transparent electrode over the optical isolation cavity; forming one or more layers of organic light-emitting material formed over the transparent electrode; forming a second electrode over the one or more layers of organic light-emitting material, said second electrode being reflective; and forming a light-scattering layer formed over the optical isolation cavity. - View Dependent Claims (15, 16)
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Specification