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The light-radiating semiconductor component has a radiation-emitting semiconductor body and a luminescence conversion element. The semiconductor body emits radiation in the ultraviolet, blue and/or green spectral region and the luminescence conversion element converts a portion of the radiation into

The light-radiating semiconductor component has a radiation-emitting semiconductor body and a luminescence conversion element. The semiconductor body emits radiation in the ultraviolet, blue and/or green spectral region and the luminescence conversion element converts a portion of the radiation into radiation of a longer wavelength. This makes it possible to produce light-emitting diodes which radiate polychromatic light, in particular white light, with only a single light-emitting semiconductor body. A particularly preferred luminescence conversion dye is YAG:Ce.

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The light-radiating semiconductor component has a radiation-emitting semiconductor body and a luminescence conversion element. The semiconductor body emits radiation in the ultraviolet, blue and/or green spectral region and the luminescence conversion element converts a portion of the radiation into

The light-radiating semiconductor component has a radiation-emitting semiconductor body and a luminescence conversion element. The semiconductor body emits radiation in the ultraviolet, blue and/or green spectral region and the luminescence conversion element converts a portion of the radiation into radiation of a longer wavelength. This makes it possible to produce light-emitting diodes which radiate polychromatic light, in particular white light, with only a single light-emitting semiconductor body. A particularly preferred luminescence conversion dye is YAG:Ce. d spectral region of the target species. 16. The method of claim 13 additionally comprising: producing a signal representing the presence of the target species in the gas sample. 17. The method of claim 13 wherein the birefringent filter comprises an input and an output polarizer with a birefringent electro-optical material interposed therebetween, said method comprising: applying a voltage to the birefringent electro-optical material to induce a modulating electric field therein. 18. The method of claim 13 wherein the target species is methane. 19. A method for detecting the presence of a target species in a gas sample, wherein the target species absorbs light in a predetermined spectral region, the method comprising: passing convergent light through the gas sample to a birefringent filter and subsequently to a detector, tuning the birefringent filter through the predetermined spectral region, and producing a signal representing the presence of the target species in the gas sample. 20. The method of claim 19 wherein the target species is methane.