Light emitting device and fabrication method thereof
First Claim
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1. A light emitting device comprising:
- a light emitting device structure including a light emitting layer and having a light extraction surface; and
a layer principally composed of an inorganic material different from a material constituting said light extraction surface, and formed on said light extraction surface of said light emitting device structure, wherein said layer principally composed of the inorganic material is optically transparent to a luminescent wavelength of said light emitting device structure, and has unevenness on a surface opposite to said light extraction surface, and said layer principally composed of the inorganic material includes a plurality of layers having different refractive indices, the refractive index of a layer on the side of said light extraction surface being greater than the refractive indice of another layer.
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Abstract
A pre-curing viscous solution (precursor solution) is applied to the back surface of a substrate for forming an optically transparent layer principally composed of an inorganic material. The substrate is heated or irradiated with UV light while being pressed with unevenness of a mold. By removing the substrate from the mold, the optically transparent, inorganic material layer principally composed of the inorganic material is formed on the substrate. In this manner, the inorganic material layer with the unevenness is formed on the back surface of the substrate (a light extraction surface) by embossing.
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Citations
34 Claims
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1. A light emitting device comprising:
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a light emitting device structure including a light emitting layer and having a light extraction surface; and
a layer principally composed of an inorganic material different from a material constituting said light extraction surface, and formed on said light extraction surface of said light emitting device structure, wherein said layer principally composed of the inorganic material is optically transparent to a luminescent wavelength of said light emitting device structure, and has unevenness on a surface opposite to said light extraction surface, and said layer principally composed of the inorganic material includes a plurality of layers having different refractive indices, the refractive index of a layer on the side of said light extraction surface being greater than the refractive indice of another layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A light emitting device comprising:
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a light emitting device structure including a light emitting layer and having a light extraction surface; and
a layer principally composed of an inorganic material different from a material constituting said light extraction surface, and formed on said light extraction surface of said light emitting device structure, wherein said layer principally composed of the inorganic material is optically transparent to a luminescent wavelength of said light emitting device structure, and has unevenness on a surface opposite to said light extraction surface, said light emitting device structure constitutes a light emitting device chip, and said layer principally composed of the inorganic material is formed on said light extraction surface of said light emitting device chip except its outer peripheral region or is smaller in thickness on the outer peripheral region of said light extraction surface of said light emitting device chip than on its remaining region. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of fabricating a light emitting device comprising the steps of:
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forming a light emitting device structure including a light emitting layer and having a light extraction surface; and
forming on said light extraction surface of said light emitting device structure a layer principally composed of an inorganic material different from a material constituting said light extraction surface that is optically transparent to a luminescent wavelength of said light emitting device structure and having unevenness on the surface opposite to said light extraction surface, wherein said step of forming said layer principally composed of the inorganic material includes the step of forming said unevenness by embossing. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification