Infrared photoluminescence of erbium-tris(8-hydroxyquinoline) in a distributed feedback cavity

► Efficient spectral selection is obtained in ErQ3-based distributed feedback cavity. ►C-band emission from 4f-4f Er transition is selected for telecommunications. ► Nanometrically tunable cavities are cheaply made by X-ray interference lithography. ► ErQ3 purity is preserved on mm2 areas when deposited by vacuum thermal evaporation.