A method and apparatus for performing wavelength-conversion...

H - Electricity – 01 – L

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H01L 21/00 (2006.01) H01L 21/20 (2006.01) H01L 27/15 (2006.01) H01L 33/00 (2006.01)

Patent

CA 2346042

An apparatus (100) comprises an active region (120), a phosphor layer (140) and a substrate (130). The active region is configured to emit light having a first band of wavelengths selected from a first group of wavelengths. The phosphor layer has a first refractive index. The phosphor layer includes a plurality of wavelength-converting phosphors. The phosphor layer is configured to convert the first band of wavelengths of light emitted from the active region to a second band of wavelengths. A center wavelength of the second band of wavelengths is greater than a center wavelength of the first band of wavelengths. The substrate is disposed between and in contact with the active region and the phosphor layer. The substrate has a second refractive index. The first refractive index substantially equals the second refractive index.

Cet appareil (100) comprend une région active (120), une couche luminophore (140) et une couche réfléchissante (130). La région active est configurée pour émettre une lumière d'une première bande de longueurs d'onde d'un premier groupe de longueurs d'onde. La couche luminophore, qui possède un premier indice de réfraction, comporte plusieurs luminophores convertisseurs de longueur d'onde. La couche luminophore est configurée pour convertir la première bande de longueurs d'onde de la lumière émise émanant de la région active en une seconde bande de longueurs d'onde. Une longueur d'onde centrale de la seconde bande de longueurs d'onde est plus grande qu'une longueur d'onde centrale de la première bande. Le substrat se trouve entre la région active et la couche luminophore est en contact avec elles. Le substrat possède un second indice de réfraction. Le premier et le second indice de réfraction sont sensiblement égaux.

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