Lighting systems
Assemblies compliant with night vision imaging system (NVIS) standards are described. Versions of the assemblies incorporate filtering material into an encapsulant for a light-emitting diode (LED) die, avoiding any necessity of using external filtering agents. Alternatively or additionally, filtering material may be incorporated into a housing of an encapsulated LED.
1. An assembly comprising:
a. an emitter of light;
b. an encapsulant configured to encapsulate the emitter and incorporating (i) phosphor and (ii) means for filtering light emitted from the emitter; and
c. a housing containing the emitter and the encapsulant.
2. An assembly according to claim 1 in which the emitter is an LED die.
3. An assembly according to claim 2 in which the filtering means comprises means for filtering either or both of infrared or near-infrared emissions of the LED die.
4. An assembly according to claim 3 in which the filtering means comprises a dye or pigment.
5. An assembly according to claim 4 in which the LED die is blue, green, or red.
6. An assembly according to claim 5 omitting any light-filtering means external to the housing.
7. An assembly according to claim 6 omitting any second LED die.
8. An assembly according to claim 1 in which light emitted from the emitter is not NVIS compliant but is NVIS compliant after filtering by the filtering means.
9. An assembly according to claim 2 further comprising a printed circuit board to which the housing is directly or indirectly attached.
10. An assembly comprising:
a. an emitter of light;
b. an encapsulant configured to encapsulate the emitter and incorporating (i) at least one quantum dot and (ii) means for filtering light emitted from the emitter; and
c. a housing containing the emitter and the encapsulant.