Light emitting diodes with improved light extraction efficiency
First Claim
1. A light emitting device comprising:
- a stack of layers including semiconductor layers comprising an active region;
a transparent lens attached to said stack by a bond affected at an interface disposed between said lens and said stack; and
a transparent bonding layer disposed between said lens and a surface of said stack, said transparent bonding layer bonding said lens to said stack, said transparent bonding layer comprising an inorganic material.
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Accused Products
Abstract
Light emitting devices with improved light extraction efficiency are provided. The light emitting devices have a stack of layers including semiconductor layers comprising an active region. The stack is bonded to a transparent lens having a refractive index for light emitted by the active region preferably greater than about 1.5, more preferably greater than about 1.8. A method of bonding a transparent lens to a light emitting device having a stack of layers including semiconductor layers comprising an active region includes elevating a temperature of the lens and the stack and applying a pressure to press the lens and the stack together. Bonding a high refractive index lens to a light emitting device improves the light extraction efficiency of the light emitting device by reducing loss due to total internal reflection. Advantageously, this improvement can be achieved without the use of an encapsulant.
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Citations
14 Claims
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1. A light emitting device comprising:
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a stack of layers including semiconductor layers comprising an active region;
a transparent lens attached to said stack by a bond affected at an interface disposed between said lens and said stack; and
a transparent bonding layer disposed between said lens and a surface of said stack, said transparent bonding layer bonding said lens to said stack, said transparent bonding layer comprising an inorganic material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification