Light emitting devices with optical elements and bonding layers
First Claim
Patent Images
1. A device comprising:
- a light emitting diode (LED) die comprising semiconductor layers including an active region, the LED die having a first coefficient of thermal expansion; and
a discrete and premade transparent optical element comprising a substantially flat bottom surface directly bonded to a top surface of the LED die, the transparent optical element having a second coefficient of thermal expansion approximately equal to the first coefficient of thermal expansion.
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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 optical element.
106 Citations
26 Claims
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1. A device comprising:
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a light emitting diode (LED) die comprising semiconductor layers including an active region, the LED die having a first coefficient of thermal expansion; and a discrete and premade transparent optical element comprising a substantially flat bottom surface directly bonded to a top surface of the LED die, the transparent optical element having a second coefficient of thermal expansion approximately equal to the first coefficient of thermal expansion. - View Dependent Claims (2, 3, 4)
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5. A device comprising:
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a light emitting diode (LED) die comprising a top surface and semiconductor layers including an active region, the LED die having a first coefficient of thermal expansion; and a discrete and premade transparent optical element comprising a substantially flat bottom surface, the transparent optical element having a second coefficient of thermal expansion approximately equal to the first coefficient of thermal expansion; and a bonding layer disposed between the top surface of the LED die and the bottom surface of the transparent optical element. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device comprising:
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a light emitting diode (LED) die comprising a top surface and semiconductor layers including an active region, the LED die having a top layer with a refractive index nLED; and a discrete and premade transparent optical element comprising a substantially flat bottom surface directly bonded to a top surface of the LED die, the transparent optical element having a refractive index nlens, where nLED≤
nlens. - View Dependent Claims (17, 18, 19, 20)
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21. A device comprising:
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a light emitting diode (LED) die comprising a top surface and semiconductor layers including an active region, the LED die having a top layer with a refractive index nLED; and a discrete and premade transparent optical element comprising a substantially flat bottom surface bonded to a top surface of the LED die, the transparent optical element having a refractive index nlens, where nLED≤
lens; anda bonding layer disposed between the top surface of the LED die and the bottom surface of the transparent optical element. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification