Light emitting device having an optically pumped semiconductor wavelength converting element
Embodiments of the invention include a semiconductor light emitting device capable of emitting first light having a first peak wavelength and a semiconductor wavelength converting element capable of absorbing the first light and emitting second light having a second peak wavelength. The semiconductor wavelength converting element is attached to a support and disposed in a path of light emitted by the semiconductor light emitting device. The semiconductor wavelength converting element is patterned to include at least two first regions of semiconductor wavelength converting material and at least one second region without semiconductor wavelength converting material disposed between the at least two first regions.
1. A structure comprising:
a semiconductor light emitting device comprising a first surface, an oppositely positioned second surface, a p-contact, and a n-contact, the p-contact and the n-contact are positioned adjacent to the first surface, the semiconductor light emitting device configured to emit a first light having a first peak wavelength through the second surface; and
a semiconductor wavelength converting element disposed adjacent to the second surface of the semiconductor light emitting device and in a path of the first light emitted by the semiconductor light emitting device and comprising
two or more light emitting epitaxially-grown semiconductor layers of a material that absorbs light at the first peak wavelength and in response emits a second light having a spectrum with a second peak wavelength and a full width half maximum of 25 nm or less,
one or more barrier layers positioned between and in direct contact with adjacent ones of the two or more light emitting epitaxially-grown semiconductor layers; and
a total thickness of light emitting epitaxially-grown semiconductor layers in the semiconductor wavelength converting element being between 10 nm and 3 μm.
2. The structure of claim 1 , wherein the semiconductor light emitting device and the semiconductor wavelength converting element comprises a same semiconductor material.
3. The structure of claim 1 comprising a bonding layer with an index of refraction greater than 1.6 attaching the semiconductor wavelength converting element to the semiconductor light emitting device.
4. The structure of claim 3 wherein the bonding layer is tellurium oxide.
5. The structure of claim 3 wherein the bonding layer comprises quantum dots.
6. The structure of claim 3 wherein the index of refraction of the bonding layer is greater than 1.9.
7. The structure of claim 3 wherein the bonding layer is a material solidified from a partially solidified or gelled state.
8. The structure of claim 1 wherein the semiconductor wavelength converting element comprises a second light emitting epitaxially-grown semiconductor layer of a material that absorbs the first light and in response emits a third light having a third peak wavelength.
9. The structure of claim 8 wherein the first peak wavelength is blue, the second peak wavelength is red, and the third peak wavelength is yellow or green.
10. The structure of claim 1 comprising a second wavelength converting element disposed in a path of the first light emitted by the semiconductor light emitting device, the second wavelength converting element comprising quantum dots.
11. The structure of claim 1 , comprising a passivated surface on the semiconductor wavelength converting element to reduce surface recombination.
12. The structure of claim 1 , comprising a textured or roughened surface on the semiconductor wavelength converting element.
13. A structure comprising:
a semiconductor light emitting device comprising a first surface, an oppositely positioned second surface, a p-contact, and a n-contact, the p-contact and the n-contact are positioned adjacent to the first surface, the semiconductor light emitting device configured to emit a first light having a first peak wavelength through the second surface; and
a semiconductor wavelength converting element disposed adjacent to the second surface of the semiconductor light emitting device and in a path of the first light emitted by the semiconductor light emitting device and comprising
two or more light emitting epitaxially-grown semiconductor layers of a material that absorbs the first light and in response emits a second light having a spectrum with a second peak wavelength and a full width half maximum of 25 nm or less;
one or more barrier layers positioned between and in direct contact with adjacent ones of the two or more light emitting epitaxially-grown semiconductor layers; and
a passivated surface to reduce surface recombination.
14. The structure of claim 13 , wherein the semiconductor light emitting device and the semiconductor wavelength converting element comprises a same semiconductor material.
15. The structure of claim 13 comprising a bonding layer with an index of refraction greater than 1.6 attaching the semiconductor wavelength converting element to the semiconductor light emitting device.
16. The structure of claim 15 wherein the bonding layer is tellurium oxide.
17. The structure of claim 15 wherein the bonding layer comprises quantum dots.
18. The structure of claim 15 wherein the index of refraction of the bonding layer is greater than 1.9.
19. The structure of claim 15 wherein the bonding layer is a material solidified from a partially solidified or gelled state.
20. The structure of claim 13 comprising a second wavelength converting element disposed in a path of the first light emitted by the semiconductor light emitting device, the second wavelength converting element comprising quantum dots.