High efficacy semiconductor light emitting devices employing remote phosphor configurations
View Patent ↗A semiconductor light emitting apparatus a semiconductor light emitting device configured to emit light inside a hollow shell including wavelength conversion material dispersed therein or thereon. A semiconductor light emitting apparatus according to some embodiments is capable of generating in excess of 230 lumens per watt.
1. A semiconductor light emitting apparatus comprising:
a wavelength conversion element comprising wavelength conversion material; and
a light emitting diode that is oriented to emit light to impinge upon the wavelength conversion element;
wherein the semiconductor light emitting apparatus produces greater than 230 lumens per watt at a color temperature of between 2000 K and 8000 K.
2. An apparatus according to claim 1 wherein the light emitting diode comprises a blue light emitting diode.
3. An apparatus according to claim 1 wherein the light emitting diode has an area greater than about 1 mm 2 .
4. An apparatus according to claim 1 wherein the light emitting diode has an area of about 4 mm 2 .
5. An apparatus according to claim 1 wherein the semiconductor light emitting apparatus produces greater than 230 lumens per watt at a color temperature of between 4000 K and 5000 K.
6. An apparatus according to claim 1 wherein the semiconductor light emitting apparatus produces greater than 230 lumens per watt at a color temperature of about 4600 K.
7. An apparatus according to claim 1 wherein the semiconductor light emitting apparatus produces greater than 230 lumens per watt at a drive current of 350 mA or less at room temperature.
8. An apparatus according to claim 1 , wherein the light emitting diode has a cross sectional area selected to provide a current density of less than 15 A/cm 2 at a drive current at which the semiconductor light emitting apparatus produces greater than 230 lumens per watt at a color temperature of between 2000 K and 8000 K.
9. An apparatus according to claim 1 , wherein the light emitting diode has a cross sectional area selected to provide a current density of less than 10 A/cm 2 at a drive current at which the semiconductor light emitting apparatus produces greater than 200 lumens per watt at a color temperature of between 2000 K and 8000 K.
10. An apparatus according to claim 1 , wherein the light emitting diode has a cross sectional area selected to provide a current density of less than 5 A/cm 2 at a drive current at which the semiconductor light emitting apparatus produces greater than 200 lumens per watt at a color temperature of between 2000 K and 8000 K.
11. An apparatus according to claim 1 , wherein the light emitting diode has a cross sectional area selected to provide a current density of less than 9 A/cm 2 at a drive current of 350 mA at a color temperature of between 2000 K and 8000 K.
12. The apparatus of claim 1 , further comprising:
a substrate;
one or more light emitting diodes disposed on the substrate;
a transparent outer shell covering the substrate and the light emitting devices and defining a volume of space between the light emitting diodes and the shell; and
an optical material remotely located at least a first distance away from the one or more light emitting devices for affecting light emitted from the one or more light emitting devices.
13. An apparatus according to claim 1 wherein the semiconductor light emitting apparatus produces between 200 and 250 lumens per watt.
14. An apparatus according to claim 13 wherein the semiconductor light emitting apparatus produces between 200 and 250 lumens per watt at a color temperature of between 4000 K and 5000 K.
15. An apparatus according to claim 13 wherein the semiconductor light emitting apparatus produces between 200 and 250 lumens per watt at a drive current of 350 mA or less at room temperature.
16. An apparatus according to claim 1 wherein the semiconductor light emitting apparatus produces between 230 and 250 lumens per watt.
17. An apparatus according to claim 14 wherein the semiconductor light emitting apparatus produces between 230 and 250 lumens per watt at a color temperature of between 4000 K and 5000 K.
18. An apparatus according to claim 13 wherein the semiconductor light emitting apparatus produces between 230 and 250 lumens per watt at a drive current of 350 mA or less at room temperature.