OLED device having improved light output
First Claim
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1. An organic light-emitting diode (OLED) device, comprising:
- a light-emitting area of an OLED comprising a first electrode, a second transparent electrode, and one or more layers of organic light-emitting material formed between the electrodes; and
a light-scattering layer, formed on a side of the transparent electrode opposite the one or more layers of organic light-emitting material, comprising transparent, light-scattering particles having a refractive index greater than or equal to 1.8 formed in a cavity, wherein the ratio of the volume of light-scattering particles to the volume of the light scattering layer is within the range of 0.55 to 0.75 over a majority of the light-emitting area.
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Abstract
An organic light-emitting diode (OLED) device, comprising: a light-emitting area of an OLED comprising a first electrode, a second transparent electrode, and one or more layers of organic light-emitting material formed between the electrodes; and a light-scattering layer, formed on a side of the transparent electrode opposite the one or more layers of organic light-emitting material, comprising transparent, light-scattering particles, wherein the ratio of the volume of light-scattering particles to the volume of the layer is greater than 0.55 over a majority of the light-emitting area.
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Citations
19 Claims
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1. An organic light-emitting diode (OLED) device, comprising:
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a light-emitting area of an OLED comprising a first electrode, a second transparent electrode, and one or more layers of organic light-emitting material formed between the electrodes; and a light-scattering layer, formed on a side of the transparent electrode opposite the one or more layers of organic light-emitting material, comprising transparent, light-scattering particles having a refractive index greater than or equal to 1.8 formed in a cavity, wherein the ratio of the volume of light-scattering particles to the volume of the light scattering layer is within the range of 0.55 to 0.75 over a majority of the light-emitting area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of forming an OLED device comprising the steps of:
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a) providing an OLED with a light-emitting area comprising a first electrode and a second transparent electrode and one or more layers of organic light-emitting material formed between the electrodes; b) forming a dispersion comprising an evaporable solvent and a plurality of transparent light scattering particles; c) coating the dispersion on a side of the transparent electrode opposite the one or more layers of organic light-emitting material; and d) drying the dispersion to form a light scattering layer on the transparent electrode, wherein the ratio of the volume of scattering particles to the volume of the light scattering layer is within the range of 0.55 to 0.75 over a majority of the light-emitting area.
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Specification