Disclosed are LED assemblies and their applications. An example LED assembly has an LED chip, a supportive structure and a transparent structure. The LED chip includes a transparent substrate, at least one LED cell, and two pads. The transparent substrate has a top surface with two terminals. The LED cell is formed on the top surface, and includes at least one light-emitting stack configured to emit light. The pad is formed on the top surface at the two terminals. The supportive structure has a transparent portion and a conductive portion. The conductive portion is connected to the transparent portion to fix the LED chip and supply electric power to at least one of the pads. The transparent structure encapsulates the LED cell.
1. A light emitting diode assembly, comprising:
an LED chip, comprising:
a transparent substrate having a top surface with two terminals;
an LED cell formed on the top surface, wherein the LED cell includes at least one light-emitting stack configured to emit light; and
two pads, formed on the top surface at the two terminals;
a supportive structure, comprising:
a transparent portion, transparent in view of the light emitted from the at least one light-emitting stack, and comprising a lamp shell in the shape of a tube with two opens; and
a conductive portion, connected to the transparent portion, for fixing the LED chip and supplying electric power to one of the pads, and comprising two conductive caps sealing the two opens and fixing the LED chip inside the lamp shell; and
a transparent structure, encapsulating the LED cell.
2. The light emitting diode assembly as claimed in claim 1 , further comprising a transparent submount with an oblong surface having two ends, two electrode plates formed on the oblong surface at the two ends respective, and the LED chip is fixed on the oblong surface and electrically coupled to the electrode plates.
3. The light emitting diode assembly as claimed in claim 2 , wherein the LED chip is fixed on the oblong surface by way of flip chip technique.
4. The light emitting diode assembly as claimed in claim 2 , wherein the LED chip is coupled to the electrode plates using bonding wires.
5. The light emitting diode assembly as claimed in claim 2 , wherein the LED chip is coupled to the electrode plates using silver paste.
6. The light emitting diode assembly as claimed in claim 2 , wherein the transparent structure includes a phosphor layer covering the LED chip and exposing the electrode plates.
7. The light emitting diode assembly as claimed in claim 1 , wherein the transparent portion has a phosphor layer.
8. The light emitting diode assembly as claimed in claim 1 , wherein the transparent structure has first and second phosphor layers, the first phosphor layer covers the LED chip, and the second phosphor layer is positioned between the LED chip and the supportive structure.
9. The light emitting diode assembly as claimed in claim 1 , wherein the transparent structure has first and second phosphor layers, the first phosphor layer covers the LED chip, and the supportive structure is between the second phosphor layer and the LED chip.
10. The light emitting diode assembly as claimed in claim 1 , wherein the transparent structure encapsulates the LED cell and exposes the pads.
11. The light emitting diode assembly as claimed in claim 1 , further comprising a transparent submount with an oblong surface, the light emitting diode assembly comprises several LED chips fixed on the oblong surface and electrically connected in series.
12. The light emitting diode assembly as claimed in claim 11 , wherein the LED chips are connected to each other by bonding wires.
13. The light emitting diode assembly as claimed in claim 11 , wherein the LED chips fixed on the transparent submount by flip chip technique.
14. The light emitting diode assembly as claimed in claim 1 , further comprising a solder or golden bump formed on each pad.
15. The light emitting diode assembly as claimed in claim 1 , wherein the top surface has a length longer than 1 mm.
16. The light emitting diode assembly as claimed in claim 1 , wherein the top surface has a length-to-width ratio more than 10.