High luminance crisp white LED light source
A light-emitting diode or device (LED) package includes a substrate, a white LED above the substrate, and a violet LED or laser above a wavelength converter of the white LED or laterally offset from the wavelength converter.
1. A light-emitting package, comprising:
a substrate;
a white light-emitting structure above the substrate, the white light-emitting structure comprising a first light-emitting device and a wavelength converter layer on the first light-emitting device, the wavelength converter layer comprising a first surface facing the first light-emitting device and a second surface opposite the first surface; and
a violet light-emitting device disposed on the second surface of the wavelength converter layer to overlie the first light-emitting device.
2. The light-emitting package of claim 1 , wherein:
the first light-emitting device of the white light-emitting structure is a blue light-emitting device die mounted on the substrate;
the wavelength converter layer is mounted on the blue light-emitting device die; and
the violet light-emitting device is mounted on the wavelength converter layer.
3. The light-emitting package of claim 2 , wherein the violet light-emitting device comprises a lateral die having electrical contacts on a top side of the die.
4. The light-emitting package of claim 3 , wherein the wavelength converter layer comprises a ceramic phosphor.
5. The light-emitting package of claim 4 , further comprising a reflective side coating on lateral surfaces of the blue light-emitting device and the wavelength converter layer.
6. The light-emitting package of claim 1 , wherein the violet light-emitting device is disposed on an opposite surface of the wavelength converter layer compared to the first light-emitting device.
7. A method for a light-emitting package to generate light, comprising:
generating a white light with a white light-emitting structure, the white light-emitting structure including a first light-emitting device and a wavelength converter layer on the first light-emitting device, the wavelength converter layer comprising a first surface facing the light-emitting device and a second surface opposite the first surface;
generating a violet light with a violet light-emitting device, the violet light-emitting device disposed on the second surface of the wavelength converter layer to overlie the first light-emitting device; and
directing light from the violet light-emitting device onto the wavelength converter layer.
8. The method of claim 7 , wherein:
the first light-emitting device of the white light-emitting structure is a blue light-emitting device die mounted on the substrate;
the wavelength converter is mounted on the blue light-emitting device die; and
the violet light-emitting device is mounted on the wavelength converter.
9. The method of claim 8 , wherein the violet light-emitting device is transparent to light emitted by the white light-emitting structure.
10. The method of claim 9 , wherein the violet light-emitting device comprises a lateral die having electrical contacts on a top side of the die.
11. The method of claim 10 , wherein the wavelength converter layer comprises a ceramic phosphor.
12. The method of claim 11 , further comprising reflecting light on lateral surfaces of the blue light-emitting device and the wavelength converter layer with a reflective side coating.