Back-to-back solid state lighting devices and associated methods
Solid state lights (SSLs) including a back-to-back solid state emitters (SSEs) and associated methods are disclosed herein. In various embodiments, an SSL can include a carrier substrate having a first surface and a second surface different from the first surface. First and second through substrate interconnects (TSIs) can extend from the first surface of the carrier substrate to the second surface. The SSL can further include a first and a second SSE, each having a front side and a back side opposite the front side. The back side of the first SSE faces the first surface of the carrier substrate and the first SSE is electrically coupled to the first and second TSIs. The back side of the second SSE faces the second surface of the carrier substrate and the second SSE is electrically coupled to the first and second TSIs.
1. A method of manufacturing a solid state light (SSL), comprising:
forming a first through substrate interconnect (TSI) extending from a first surface of a carrier substrate to a second surface of the carrier substrate different from the first surface;
forming a second TSI extending from the first surface of the carrier substrate to the second surface of the carrier substrate;
mounting a first solid state emitter (SSE) to the first surface of the carrier substrate directly overlapping the first and second TSIs, wherein the first SSE includes a first reflective material attached with a first transparent electrically conductive material to a second side of the first SSE, the second side of the first SSE facing the first surface of the carrier substrate;
mounting a second SSE to the second surface of the carrier substrate directly overlapping the first and second TSIs, wherein the second SSE includes a second reflective material attached with a second transparent electrically conductive material to a second side of the second SSE, the second side of the second SSE facing the second surface of the carrier substrate;
electrically coupling the first TSI to the first and second SSEs; and
electrically coupling the second TSI to the first and second SSEs.
2. The method of claim 1 wherein:
the first surface of the carrier substrate is opposite the second surface;
the first SSE comprises a first semiconductor material at a first side of the first SSE, a second semiconductor material at the second side of the first SSE opposite the first side, wherein the first semiconductor material includes a first contact and the second semiconductor material includes a second contact;
the second SSE comprises a first semiconductor material at a first side of the second SSE, a second semiconductor material at the second side of the second SSE opposite from the first side, and wherein the first semiconductor material includes a first contact and the second semiconductor material includes a second contact; and
the method further comprises electrically coupling the first contacts of the first and second SSEs to the first TSI and electrically coupling the second contacts of the first and second SSEs to the second TSI.
3. The method of claim 2 , further comprising:
exposing the first contact of the first SSE; and
electrically coupling the first contact to the first TSI with a conductive member.
4. The method of claim 2 wherein the first contacts of the first and second SSEs are buried contacts, and electrically coupling the first TSI further comprises:
forming a first aperture in the first SSE, wherein the first aperture extends from the second side of the first SSE to the first contact buried in the first SSE;
forming a second aperture in the second SSE, wherein the second aperture extends from the second side of the second SSE to the first contact buried in the second SSE;
forming a first electrical connector extending from the first TSI through the first aperture to the first contact buried in the first SSE;
forming a second electrical connector extending from the first TSI through the second aperture to the first contact buried in the second SSE; and
depositing a dielectric material in the first and second apertures, wherein the dielectric material is configured to electrically isolate the first and second electrical connectors from at least the second semiconductor material.
5. The method of claim 1 wherein the carrier substrate comprises aluminum nitride.
6. The method of claim 1 wherein the carrier substrate comprises a conductive core electrically isolated from the first and second TSIs and the first and second SSEs.
7. The method of claim 1 , further comprising:
coupling a rotation device to the first and second SSEs to rotate the first and second SSEs around at least one axis.
8. The method of claim 7 wherein the rotation device rotates the SSL at a speed at least sufficient to emulate a generally constant stream of light from the SSL.
9. The method of claim 8 wherein the rotation device rotates the SSL at a speed that produces intermittent flashes of light from the SSL.
10. The method of claim 1 wherein the first SSE is one of a plurality of first SSEs, the second SSE is one of a plurality of second SSEs, and the first and second TSIs are one of a plurality of first and second TSIs corresponding to the plurality of first and second SSEs.
11. The method of claim 1 wherein the first SSE emits a first color of light and the second SSE emits a second color of light different from the first color of light.
12. The method of claim 1 , further comprising:
placing a first converter material at least partially over the first SSE; and
placing a second converter material different from the first converter material at least partially over the second SSE.
13. The method of claim 1 , further comprising:
mounting at least one additional SSE to a third surface of the carrier substrate;
electrically coupling the first TSI to the additional SSE; and
electrically coupling the second TSI to the additional SSE.