TUNABLE WHITE POINT LIGHT SOURCE USING WAVELENGTH CONVERTING ELEMENT Russian patent published in 2012 - IPC H01L25/75 

FIELD: physics.

SUBSTANCE: disclosed source of uniform high-brightness light has at least two same-type light emitting diode chips, each of which produces light having wavelengths which differ by 5 nm or more, and a wavelength converting element comprising at least two different wavelength converting materials which convert light to different colours. The intensity of the light produced by the LED chips may be varied to provide a tunable correlated colour temperature white point. The wavelength converting element may be, for example, a stack or mixture of phosphor or luminescent ceramics. Moreover, the process of manufacturing the light source is simplified since the LED chips are all manufactured using the same technology, eliminating the need to manufacture different types of chips.

EFFECT: simple manufacturing and controlling a tunable white point light source.

28 cl, 10 dwg