Luminescence in its various forms has attracted the attention of different disciplines in natural sciences for more than 150 years. First examples were described back in the days when aesculin, a coumarin-based glyco-conjugate from horse chestnut was found to show blue fluorescence.1 The German scientist Paul Krais intensively investigated this effect as well as its application for optical brightening of cotton. Ever since, fluorescence, as well as its long-lived counterpart phosphorescence, have been used for multiple applications, such as material sciences and molecular bioimaging. Classic emitters feature extended conjugated π-systems and include functional groups with electron donating and withdrawing capabilities that modulate the excited state properties. Luminophors such as BODIPY dyes, rhodamine as well as fluorescein and its derivatives are widely used, commercially available, easy to handle and reveal striking photophysical properties, such as high quantum efficiencies, as well as tuneable emission wavelengths. When transition metal complexes are coordinated by organic luminophoric ligands and participate in the excited state, phosphorescence is facilitated due to mixing of singlet and triplet states. This effect is maximized by 4d- and 5d-block elements with 6 or 8 d-electrons possessing higher ligand field splitting and a relativistic spin-orbit coupling. While Pt(II) and Au(III) usually yield phosphorescent coordination compounds that stack from non-emissive monomers into luminescent aggregates,2 it is also known that microsecond-lived luminescence can be expected from purely organic chromophores (thermally delayed fluorescence or pure phosphorescence).3 One major drawback of classical luminophores is that specific binding events or accumulation cannot be monitored directly by using the emission output as a readout, as it normally does not show a significant shift in wavelength and lifetime. On the other hand, aggregation tends to quench their emission due to π-π stacking or triplet-triplet annihilation. This aggregation-related quenching of fluorescence or phosphorescence via radiationless deactivation pathways is called aggregation caused quenching (ACQ). In 2001, Tang and his co-workers described a concept for the design of fluorescent materials, which are radically different from classical luminophores.4 These compounds, bearing highly motile rotors (e. g. phenyl rings), are able to emit in the aggregated state or when confined in sterically demanding environments, but they do not show emission in the dissolved form due to a conversion of the absorbed energy into rotational and vibrational motion. This phenomenon was coined as aggregation-induced emission (AIE), and has attracted lot of interest in the scientific community for multiple applications in modern inorganic, organic physical and biomedical chemistry. Later on, examples of aggregation-induced phosphorescence were also described, in which intermetallic interactions cause a prominent red-shift.5 In crystalline phases, aggregated luminophores can also display wave-guiding effects.