ILLUMINATION DEVICE WITH LED AND TRANSMISSIVE SUPPORT CONTAINING LUMINESCENT MATERIAL Russian patent published in 2013 - IPC H01L33/50 

FIELD: physics.

SUBSTANCE: illumination device (10) includes: a light-emitting diode (LED) (20), a radiation emitting LED (21); a transmissive support (50), which contains luminescent material (51), where the luminescent material (51) is arranged to absorb at least part of radiation of LED (21) and emit luminescent material emission (13). The LED (20) and luminescent material (51) are configured to generate light (115) of a predetermined colour; a translucent exit window (60) arranged to transmit at least part of the light (15); a LED cavity (11) and a diffuser cavity (12). The LED cavity (11) has a LED cavity side wall (45) and a LED cavity cross section (211), and the diffuser cavity (12) has a diffuser cavity side wall (41) and a diffuser cavity cross section (212), wherein the transmissive support (50) is downstream of the LED (20) and upstream of the translucent exit window (60); the LED cavity (11) is upstream of the transmissive support (50) and downstream of the LED (20); the diffuser cavity (12) is downstream of the transmissive support (50) and upstream of the translucent exit window (60); the ratio of the diffuser cavity cross section (212) and LED cavity cross section (211) is in the range of 1.01 to 2.

EFFECT: design of an illumination device with a virtually colourless outward appearance in the off state.

12 cl, 1 ex, 1 tbl, 2 dwg