Wavelength converted light emitting device including a semiconductor wavelength converting material and a ceramic phosphor
View Patent ↗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 capable of emitting first light having a first peak wavelength;
a semiconductor wavelength converting element disposed in a path of the first light emitted by the semiconductor light emitting device and comprising a light emitting layer of a semiconductor wavelength material capable of absorbing the first light and in response emitting second light having a second peak wavelength;
a passivated surface of the semiconductor wavelength converting element; and
a ceramic phosphor attached to and supporting the semiconductor wavelength converting element and capable of emitting third light having a third peak wavelength and a spectral width greater than a spectral width of the second light.
2. The structure of claim 1 wherein the passivated surface of the semiconductor wavelength converting element is passivated by one of the group consisting of sulfur applied with a (NH4)2Sx treatment, hydrogen passivation, oxygen passivation, nitrogen passivation, and native oxide formation.
3. The structure of claim 1 wherein a surface of the semiconductor wavelength converting element is one of textured and roughened.
4. The structure of claim 1 wherein the second peak wavelength is red.
5. The structure of claim 1 wherein the semiconductor wavelength converting material comprises at least one of a III-V semiconductor and a II-VI semiconductor.
6. The structure of claim 1 wherein a surface of the ceramic phosphor is one of textured and roughened.
7. The structure of claim 1 wherein the third peak wavelength is one of green and yellow.
8. The structure of claim 1 , wherein the semiconductor wavelength converting element comprises a plurality of light emitting layers separated by at least one barrier layer.
9. The structure of claim 1 wherein the semiconductor wavelength converting element comprises a double heterostructure.
10. The structure of claim 1 wherein the ceramic phosphor is one of transparent, translucent, and scattering.
11. The structure of claim 1 wherein the ceramic phosphor is a ceramic phosphor plate.
12. The structure of claim 1 further comprising a light extraction element, wherein the semiconductor wavelength converting element is disposed between the semiconductor light emitting device and the light extraction element.
13. The structure of claim 12 wherein the light extraction element comprises a transparent plate with a roughened or patterned surface.