Optical sensor

An optical sensor that captures a heart rate and/or a blood oxygen content, comprising:

• a light source comprising at least one light-emitting semiconductor chip and emits electromagnetic radiation with three different wavelength ranges, wherein a first wavelength range comprises green light, a second wavelength range comprises red light and a third wavelength range comprises infrared radiation, and
• three light detectors, wherein the three light detectors each comprise a filter for electromagnetic radiation, wherein a first filter is transmissive for light of the first wavelength range and non-transmissive for light of the second wavelength range and the infrared radiation of the third wavelength range, a second filter is transmissive for light of the second wavelength range and non-transmissive for light of the first wavelength range and the infrared radiation of the third wavelength range and a third filter is transmissive for the infrared radiation of the third wavelength range and non-transmissive for light of the first and the second wavelength range, wherein the light-emitting semiconductor chip has an emission wavelength of less than 570 nanometers and the light source comprises a conversion phosphor, the conversion phosphor converts the light of the semiconductor chip into electromagnetic radiation with the first wavelength range, the second wavelength range and the third wavelength range, the conversion phosphor comprises a matrix material with three different narrowband phosphors, and the emission wavelengths of the phosphors lie within the three wavelength ranges.