Conversion element for the wavelength conversion of electromagnetic radiation from a first wavelength range to electromagnetic radiation from a second wavelength range (10a, 10b, 10c), which comprises longer wavelengths than the first wavelength range, comprising - a matrix material, the optical refractive index of which is temperature-dependent, and - at least two different types of luminophore particles (2a, 2b, 2c) wherein - a multiplicity of luminophore particles (2a, 2b, 2c) of each of the types are distributed in the matrix material, - luminophore particles (2a, 2b, 2c) of different types differ from one another in terms of average particle size and/or material, wherein - the conversion element, upon excitation by electromagnetic radiation from the first wavelength range emits mixed radiation comprising electromagnetic radiation from the first and the second wavelength range (10a, 10b, 10c), and - the correlated colour temperature and/or the colour locus of the mixed radiation remain(s) substantially the same when the matrix material is at a temperature of between at least 25°C and at most 150°C, wherein, as the temperature rises, - the temperature-dependent shift of the electromagnetic radiation from the first wavelength range generated by an optoelectronic component, - the temperature dependence of the quantum efficiency of the luminophore conversion and - the temperature dependence of the luminophore absorption lead to a colour locus shift in the direction of the electromagnetic radiation from the first wavelength range, and - the change in refractive index of the matrix material of the conversion element brings about a partial compensation of this colour locus shift, wherein, in the case of a first type of luminophore, the compensation of the shift towards electromagnetic radiation from the first wavelength range turns out to be too small for the colour locus to remain the same, and, in the case of a second type of luminophores, an overcompensation occurs for particles (2a, 2b, 2c) of this luminophore, that is to say that the mixed radiation shifts in the direction of the electromagnetic radiation from the second wavelength range (10a, 10b, 10c), characterized in that in the conversion element the correlated colour temperature of the mixed radiation varies by at most 60 K when the matrix material is at a temperature of between at least 25°C and at most 150°C. - a matrix material, the optical refractive index of which is temperature-dependent, and - at least two different types of luminophore particles (2a, 2b, 2c) wherein - a multiplicity of luminophore particles (2a, 2b, 2c) of each of the types are distributed in the matrix material, - luminophore particles (2a, 2b, 2c) of different types differ from one another in terms of average particle size and/or material, wherein - the conversion element, upon excitation by electromagnetic radiation from the first wavelength range emits mixed radiation comprising electromagnetic radiation from the first and the second wavelength range (10a, 10b, 10c), and - the correlated colour temperature and/or the colour locus of the mixed radiation remain(s) substantially the same when the matrix material is at a temperature of between at least 25°C and at most 150°C, - the temperature-dependent shift of the electromagnetic radiation from the first wavelength range generated by an optoelectronic component, - the temperature dependence of the quantum efficiency of the luminophore conversion and - the temperature dependence of the luminophore absorption - the change in refractive index of the matrix material of the conversion element brings about a partial compensation of this colour locus shift,