Indicia for light emitting diode chips
Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly LED chips and related methods are disclosed. LED chips are provided that include an indicia arranged between a primary light-emitting face and a mounting face of the LED chip. The indicia may include at least one of a logo, one or more alphanumeric characters, or a symbol, among others that are configured to convey information. Arrangements of at least one of an n-contact, a p-contact, or a reflector layer of the LED chip may form the indicia. LED chips are also provided where at least a portion of an indicia is arranged on a mounting face of the LED chip. Indicia are provided that may be visible through primary light-emitting faces when LED chips are electrically activated or electrically deactivated. In this regard, the indicia may be embedded within LED chips while still being able to convey information.
1. A light emitting diode (LED) chip, comprising:
a mounting face configured to be mounted to a surface;
a primary light-emitting face that is opposite the mounting face;
an active LED structure arranged between the mounting face and the primary light-emitting face, wherein the active LED structure comprises an n-type layer, a p-type layer, and an active layer arranged between the n-type layer and the p-type layer; and
an indicia arranged between the mounting face and the primary light-emitting face, wherein the indicia extends through an opening in the p-type layer and the active layer and a continuous portion of the opening is elongated across the primary light-emitting face to form an outline of the indicia, and wherein a portion of the p-type layer and the active layer are bounded within the outline of the indicia.
2. The LED chip of claim 1 , wherein the indicia comprises at least one of a logo, one or more alphanumeric characters, a symbol, an alignment marker, a fiducial marker, or a polarity marker configured to convey information.
3. The LED chip of claim 1 , wherein the indicia is arranged closer to the mounting face than the primary light-emitting face.
4. The LED chip of claim 1 , further comprising an n-contact electrically connected to the n-type layer, wherein a portion of the n-contact forms the indicia.
5. The LED chip of claim 4 , wherein the n-contact comprises one or more n-contact interconnects that extend through a portion of the active LED structure to the n-type layer.
6. The LED chip of claim 5 , wherein the one or more n-contact interconnects form the indicia.
7. The LED chip of claim 5 , wherein the one or more n-contact interconnects form the outline of the indicia.
8. The LED chip of claim 7 , wherein the portion of the active LED structure that is bounded by the outline is continuous with other portions of the active LED structure that are not bounded by the outline.
9. The LED chip of claim 1 , further comprising a reflective structure on the p-type layer, wherein a portion of the reflective structure forms the indicia.
10. The LED chip of claim 9 , wherein the reflective structure comprises a metal layer, a dielectric layer, and one or more reflective layer interconnects that extend through a portion of the dielectric layer.
11. The LED chip of claim 10 , wherein the one or more reflective layer interconnects form the indicia.
12. The LED chip of claim 9 , wherein a pattern of the reflective structure forms the indicia.
13. The LED chip of claim 1 further comprising:
an n-contact electrically connected to the n-type layer, wherein a portion of the n-contact forms the indicia; and
a reflector layer on the p-type layer wherein a portion of the reflector layer forms another indicia.
14. The LED chip of claim 1 , further comprising a growth substrate, wherein a portion of the growth substrate forms the primary light-emitting face.
15. A light emitting diode (LED) chip, comprising:
a mounting face configured to be mounted to a surface;
a primary light-emitting face that is opposite the mounting face;
an active LED structure arranged between the mounting face and the primary light-emitting face, wherein the active LED structure comprises an n-type layer, a p-type layer, and an active layer arranged between the n-type layer and the p-type layer;
a passivation layer on the p-type layer; and
a p-contact electrically connected to the p-type layer, wherein the p-contact comprises a portion that is on the mounting face and a plurality of p-contact interconnects that extend through the passivation layer, wherein individual ones of the plurality of the p-contact interconnects extend through the passivation layer with different shapes from one another and the plurality of p-contact interconnects are grouped together to form at least a portion of an indicia arranged on the mounting face.
16. The LED chip of claim 15 , wherein the p-contact and the plurality of the p-contact interconnects form the indicia.
17. The LED chip of claim 15 , wherein the portion of the p-contact that is on the mounting face forms another portion of the indicia.
18. The LED chip of claim 15 , wherein the indicia comprises at least one of a logo, one or more alphanumeric characters, a symbol, an alignment marker, a fiducial marker, or a polarity marker configured to convey information.