In this work, we investigated the luminescent properties of two-dimensional photonic crystals (PhCs) with ordered Ge(Si) nanoislands obtained using one- and two-stage approaches to ordering. The features of the luminescent  response of such structures and their relationship with the ordering processes of nanoislands are considered. It is shown that the incorporation of Ge(Si) nanoislands into a two-dimensional PhC makes it possible to increase the  intensity of their luminescent response by more than an order of magnitude, which makes the structures under consideration promising for practical applications.