Light source and method for producing light modifiable in colour and/or luminosity

Abstract

The present invention relates to a light source, which produces light leaving the light source with modifiable colour and luminosity, with at least one light emitting diode for emitting primary radiation, comprising a layer connected with said diode, wherein said layer includes at least one luminescent material for converting the primary radiation into a secondary radiation.

Description

Light source and method for producing light whose color and / or brightness can be changed technical field The invention relates to a light source with at least one light-emitting diode emitting primary radiation, said light source comprising a layer connected to said diode, said layer comprising at least one luminescent material for converting primary radiation into secondary radiation. Background technique It is well known that light emitting diodes (LEDs), such as phosphor converted light emitting diodes, produce light with a high color rendering index. However, the color temperature of the light of each individual phosphor-converted light-emitting diode is fixed over a wide color temperature range. An obvious disadvantage is that by increasing the excitation density to the phosphor, the phosphor starts to saturate due to ground-state depletion or thermal quenching of luminescence. During this saturation process, the layer with luminescent material emits more and more pr...

AI Technical Summary

Problems solved by technology

A disadvantage of known light sources is that the color of the light leaving the light source changes as the brightness of the light changes

Another issue is the temperature of each diode, which increases as power dissipation increases

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