Light emitting diode package
To provide a light emitting diode package of which the height of protrusion of a thermal via is decreased without decreasing the flexural strength of an insulating substrate. A light emitting diode package comprising a light emitting diode element mounted on a substrate, wherein the substrate is obtained by firing a glass ceramic composition containing a powder of glass containing, as represented by mole percentage, from 57 to 65% of SiO 2 , from 13 to 18% of B 2 O 3 , from 9 to 23% of CaO, from 3 to 8% of Al 2 O 3 and from 0.5 to 6% of at least one of K 2 O and Na 2 O in total, and a ceramic filler.
1. A light emitting diode package comprising a light emitting diode element mounted on a substrate, wherein the substrate is obtained by firing a glass ceramic composition containing a powder of glass containing, as represented by mole percentage, from 57 to 65% of SiO 2 , from 13 to 18% of B 2 O 3 , from 9 to 23% of CaO, from 3 to 8% of Al 2 O 3 and from 0.5 to 6% of at least one of K 2 O and Na 2 O in total, and a ceramic filler.
2. The light emitting diode package according to claim 1 , wherein the glass contains at least 58 mol % of SiO 2 .
3. The light emitting diode package according to claim 1 , wherein the glass contains at least 12 mol % of CaO.
4. The light emitting diode package according to claim 1 , wherein the glass contains at most 17 mol % of CaO, from 4 to 7 mol % of Al 2 O 3 , and at most 4% of K 2 O and Na 2 O in total.
5. The light emitting diode package according to claim 1 , wherein the ceramic filler is an alumina powder.
6. The light emitting diode package according to claim 5 , wherein the ceramic filler contains an alumina powder and a zirconia powder.
7. The light emitting diode package according to claim 1 , wherein the glass ceramic composition contains, as represented by mass percentage, from 25 to 55% of the powder of glass and from 45 to 75% of the ceramic filler.
8. The light emitting diode package according to claim 7 , wherein the glass ceramic composition contains, as represented by mass percentage, at least 30% of an alumina powder.
9. The light emitting diode package according to claim 8 , wherein the glass ceramic composition contains, as represented by mass percentage, at least 5% of a zirconia powder.
10. The light emitting diode package according to claim 1 , wherein at least one through hole conductor is provided on the substrate, and the light emitting diode element is mounted on at least one of said through hole conductor.
11. The light emitting diode package according to claim 10 , wherein a heatsink is formed on the other side of the substrate opposite to the side where the light emitting diode element is mounted, and at least one of the through hole conductor on which the light emitting diode element is mounted is a thermal via connected to the heatsink.
12. The light emitting diode package according to claim 11 , wherein the conductor of the thermal via protrudes from the side of the substrate on which the light emitting diode element is mounted, and the amount of protrusion is at most 5 μm.
13. The light emitting diode package according to claim 1 , wherein the flexural strength of the substrate is at least 250 MPa.