Method and apparatus for coupling light-emitting elements with light-converting material
Light-emitting elements such as LEDs are associated with light-converting material such as phosphor and/or other material. A donor substrate comprising the light-converting and/or other material is suitably placed relative to a target substrate associated with the light-emitting elements. A laser or other energy source is then used to transfer the light-converting and/or other material in a pattern via writing or masking from the donor substrate to the target substrate in accordance with the pattern. Addressability and targetability of the transfer process facilitates precise patterning of the target substrate.
1. An article comprising:
a layer of light-converting material, the layer having an input surface for receiving input light from a light source that has a source perimeter, the layer of light-converting material extending laterally beyond the source perimeter, the light-converting material in the layer being arranged in a pattern and configured to output light of a different chromaticity than the input light,
wherein the pattern comprises multiple discrete features, each discrete feature extending beyond the source perimeter, the discrete features of the pattern being sized and shaped so that a proportion of the light source encompassed by the source perimeter that overlaps with the discrete features is insensitive to a lateral placement of the pattern with respect to the source perimeter.
2. The article of claim 1 further comprising a transparent carrier substrate, wherein the layer of the light-converting material is supported by the transparent carrier substrate.
3. The article of claim 2 , wherein the transparent carrier substrate is planar.
4. The article of claim 2 , wherein the transparent carrier substrate extends beyond the layer of the light-converting material.
5. A lighting device comprising:
the article according to claim 1 ; and
a light source.
6. The lighting device of claim 5 , wherein the light source is a light-emitting diode (LED).
7. The lighting device of claim 6 , wherein the input surface of the article is directly coupled to the LED.