Three-dimensional illuminators

1. An illuminator comprising:

a first electrode;

a second electrode; and

a light-emitting chip comprising a plurality of light-emitting layers arranged three-dimensionally, and the plurality of light-emitting layers forming at least one light-emitting region at each surface of the light-emitting chip;

wherein the first and second electrodes are configured for providing different voltages to the light-emitting chip, and the light-emitting chip is capable of simultaneously emitting light from each light-emitting region of the light-emitting chip.

2. The illuminator of claim 1 , wherein the light-emitting chip further comprises four P-type layers and four N-type layers, the four P-type layers, the four N-type layers and the plurality of light-emitting layers cooperatively constituting a cubic structure, the four P-type layers and the four N-type layers being symmetrically arranged at corners of the cubic structure along each body diagonal thereof, the plurality of the light-emitting layers being interposed therein between the P-type layers and the N-type layers.

3. The illuminator of claim 1 , wherein one P-type layer, one N-type layer adjacent to the P-type layer, and one light-emitting layer between the P-type layer and the N-type layer cooperatively constitute a P-N junction.

4. The illuminator of claim 1 , wherein the first electrode applies a first voltage to the four P-type layers, and the second electrode applies a second voltage less than the first voltage to the four N-type layers.

5. The illuminator of claim 1 , wherein the first electrode comprises a concave depression, with the light-emitting chip positioned therein.

6. The illuminator of claim 1 , wherein the first electrode comprises a first surface and a second surface engaging the first surface, the first and the second surfaces together forming a concave depression with an opening, the second surface configured for reflecting light from the light-emitting chip to the first surface, and the first surface configured for reflecting light from the light-emitting chip and the second surface to the opening of the concave.

7. The illuminator of claim 6 , wherein the first surface upwardly protrudes.

8. The illuminator of claim 6 , wherein the first surface downwardly protrudes.

9. The illuminator of claim 6 , wherein the light-emitting chip is substantially encircled by the first surface and is disposed on the second surface.

10. The illuminator of claim 1 , further comprising a transparent shell, wherein the transparent shell receives the first electrode, the second electrode and the light-emitting chip.

11. The illuminator of claim 10 , wherein the shell is a vacuum.

12. The illuminator of claim 10 , wherein the shell is filled with helium, neon, argon, xenon, or a mixture of two or more of these gases.

13. The illuminator of claim 1 , wherein the light-emitting chip is globular.

14. An illuminator comprising a light-emitting chip having a cubic structure, wherein the light-emitting chip is capable of emitting light simultaneously from all surfaces of the cubic structure.

15. The illuminator of claim 14 , further comprising a first electrode and a second electrode configured for providing different voltages to the light-emitting chip.

16. The illuminator of claim 15 , wherein the first electrode comprises a first surface and a second surface engaging and encircled by the first surface, the first and second surfaces defining a concave depression, the light-emitting chip being disposed on the second surface and surrounded by the first surface.

17. The illuminator of claim 15 , wherein the light-emitting chip comprises four P-type layers, four N-type layers, and a plurality of light-emitting layers, the four P-type layers, the four N-type layers and the plurality of light-emitting layers cooperatively constituting the cubic structure, the four P-type layers and the four N-type layers being symmetrically arranged at corners of the cubic structure along each body diagonal thereof, the plurality of the light-emitting layers being interposed therein between the P-type layers and the N-type layers.

18. The illuminator of claim 17 , wherein the first electrode is electrically connected to the four P-type layers, and the second electrode is electrically connected to the four N-type layers.

19. A light-emitting chip comprising:

a plurality of P-type semiconductor segments;

a plurality of N-type semiconductor segments; and

a light-emitting segment;

wherein the P-type semiconductor segments, the N-type semiconductor segments, and the light-emitting segment cooperatively constitute a three-dimensional structure;

along an X-axis of a Cartesian system of the light-emitting chip, one of the P-type semiconductor segments is separated from one of the N-type semiconductor segments by the light-emitting segment;

along a Y-axis of the Cartesian system, one of the P-type semiconductor segments is separated from one of the N-type semiconductor segments by the light-emitting segment;

along a Z-axis of the Cartesian system, one of the P-type semiconductor segments is separated from one of the N-type semiconductor segments by the light-emitting segment; and

when a voltage differential is applied to the light-emitting chip, the light-emitting chip is capable of emitting light simultaneously from each surface of the three-dimensional structure.

20. The light-emitting chip of claim 19 , wherein the three-dimensional structure is a parallelepiped.