OLED device having improved light output
First Claim
1. 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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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.
55 Citations
18 Claims
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1. A bottom-emitting organic light-emitting diode (OLED) device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of making an optical isolation cavity in a bottom-emitting organic light-emitting diode (OLED) device, comprising:
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providing a transparent substrate;
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; and
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. - View Dependent Claims (15, 16, 17, 18)
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Specification