The increasing number of the heteronuclear complexes involves the great interest in coordination chemistry. These species cause interest because of their properties which allow to consider them as perspective objects of research both with fundamental and applied orientation. Polyaminopolycarboxylic acids are the one of the most suitable organic ligands by means of which it is possible to receive heteronuclear species. In particular, the donor properties of diethylene triaminepentaacetic acid (DTPA) open up possibilities to obtain the complexes internal coordination sphere of which includes simultaneously two or more different metals. However, the heteronuclear lanthanide complexes are studied much less in comparison with mononuclear ones. The overwhelming number of works is devoted to f-d- and f-s-complexes. At the same time the data of f-p-complexes are singular. In this work we represent a part of research of spectral-luminescent properties of heteronuclear germanium-lanthanide complexes with general formula [Ge(OH)(DTPA)Ln(HDTPA)Ge(OH)], where Ln = Eu, Tb. In considered complexes the 4f-luminescence of three-charged ions of europium and terbium with maxima at 615 nm (5D0→7F2 transition) and 547 nm (5D4→7F5 transition), respectively, is realized at UV-excitation [1, 2]. It is noteworthy that it is the first observation of 4f-luminescence in water solutions of heteronuclear f-p-complexes. Non-trivial approaches to the increasing of the f-luminescence (for Tb3+ and Eu3+ ions) in these complexes are described and discussed as well.