Light conversion package
A light conversion package for a semiconductor light source includes a light conversion block, a substrate, and an interconnector. The light conversion block is positioned to receive incident light from the semiconductor light source and acts to convert the incident light to light having a different spectral distribution. The interconnector attaches the light conversion block to the substrate and limits a thermal resistance between the light conversion block and the substrate so that the substrate can efficiently sink heat from the light conversion block. The interconnector and the substrate together may still provide high reflectivity.
1. A lighting system comprising:
a light source;
a light conversion block having a top surface and a bottom surface, the light conversion block positioned such that the top surface receives an output light from the light source and converts at least a portion of the output light from the light source to a converted light with a spectral distribution that differs from the spectral distribution of the output light from the light source, the light conversion block having an area of 0.5 mm by 0.5 mm or less;
a substrate having a top surface and a bottom surface, at least the top surface of the substrate being reflective and covering at least the entire bottom surface of the light conversion block; and
an interconnector between the bottom surface of the light conversion block and the top surface of the substrate, the interconnector comprising:
a first metal layer under the bottom surface of the light conversion block and having a thickness in a range of 1 μm to 5 μm,
a second metal layer on a top surface of the substrate and having a thickness in a range of 1 μm to 2 μm,
a third metal layer that extends on sides of the light conversion block between the light conversion block and the first metal layer, and
a solder region between the first metal layer and the second metal layer and having a thickness in a range of 2 μm to 50 μm,
the interconnector and the substrate configured to reflect the output light from the light source and the converted light with a reflectivity greater than 85% such that the converted light and output light from the light source exit the light conversion block through the top surface.
2. The light conversion system of claim 1 , wherein the reflectivity is greater than 90%.
3. The light conversion system of claim 1 , wherein the reflectivity is greater than 97%.
4. The system of claim 1 , wherein the light conversion block has a thickness between to and 150 microns.
5. The system according to claim 1 , wherein the solder region of the interconnector comprises a solder layer.
6. The system according to claim 1 , wherein the light source comprises a laser.
7. The system according to claim 1 , wherein the lighting system is a lamp or an automotive headlamp.