Light-emitting device
AssigneeEpistar Corporation
InventorsMin-Hsun Hsieh, Chien-Yuan Wang, Tsung-Xian Lee, Chih-Ming Wang, Ming-Chi Hsu, Han-Min Wu
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Abstract
Disclosed is a light-emitting device comprising: a carrier; a light-emitting element disposed on the carrier; a first light guide layer covering the light-emitting element; a second light guide layer covering the first light guide layer; a low refractive index layer between the first light guide layer and the second light guide layer to reflect the light from the second light guide layer; and a wavelength conversion layer covering the second light guide layer; wherein the low refractive index layer has a refractive index smaller than one of the refractive indices of first light guide layer and the second light guide layer.
Claims18
A light-emitting device comprising:
- a carrier;
- a light-emitting element disposed on the carrier;
- a first light guide layer covering the light-emitting element;
- a second light guide layer covering the first light guide layer;
- a low refractive index layer between the first light guide layer and the second light guide layer to reflect the light from the second light guide layer;
- a wavelength conversion layer covering the second light guide layer;
- and
- a third light guide layer covering the wavelength conversion layer;
- wherein the low refractive index layer has a refractive index smaller than one of the refractive indices of first light guide layer and the second light guide layer and wherein the refractive index of the second light guide layer is greater than that of the third light guide layer.
A light-emitting device comprising:
- a carrier;
- a light-emitting element disposed on the carrier;
- a first light guide layer covering the light-emitting element;
- a second light guide layer covering the first light guide layer;
- a low refractive index layer between the first light guide layer and the second light guide layer to reflect the light from the second light guide layer;
- and
- a wavelength conversion layer covering the second light guide layer;
- wherein the low refractive index layer has a refractive index smaller than one of the refractive indices of first light guide layer and the second light guide layer;
- and
- wherein the first light guide layer comprises a first plurality of layers each having a refractive index, and the refractive indices of the first plurality of layers are gradient arranged.
A light-emitting device comprising:
- a carrier;
- a light-emitting element disposed on the carrier;
- a first light guide layer covering the light-emitting element;
- a second light guide layer covering the first light guide layer;
- a low refractive index layer between the first light guide layer and the second light guide layer to reflect the light from the second light guide layer;
- a wavelength conversion layer covering the second light guide layer;
- and
- a third light guide layer covering the wavelength conversion layer;
- wherein the low refractive index layer has a refractive index smaller than one of the refractive indices of first light guide layer and the second light guide layer;
- and
- wherein the wavelength conversion layer comprises a phosphor layer formed by mixing a phosphor with epoxy resin.
Dependencies are inferred from the claim text.