WAVELENGTH CONVERSION LAYERS WITH EMBEDDED CRYSTALLITES

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The present invention is directed to a wavelength conversion layer with a matrix layer comprising embedded rare-earth-ion-doped micro crystallites and/or rare- earth-ion-doped amorphous particles, wherein said rare-earth-ion-doped micro crystallites and/or rare-earth-ion-doped amorphous particles are doped with at least one of the lanthanides, wherein said rare-earth-ion-doped micro crystallites and/or said doped amorphous particles having a mean diameter d50 of 10 nm to 500 µm, and wherein the matrix layer is transparent, whereby the refractive indices of said rare- earth-ion-doped micro crystallites and/or said rare-earth-ion-doped amorphous particles match the refractive indices of the matrix layer with a Δn ≥ 0 and ≤ 0.1 for at least one wavelength in the range of 400 nm to 1200 nm.