Fine‐Tuning of the Chromaticity of the Emission Color of Organic–Inorganic Hybrids Co‐Doped with EuIII, TbIII, and TmIII

Abstract A fine‐tuning of the emission chromaticity from red to green is reported for organic–inorganic nanostructured hybrids co‐doped with Eu 3+ , Tb 3+ , and Tm 3+ . Raising the temperature from 200 to 300 K changes the color coordinates smoothly from the yellowish–green region of the chromaticity diagram towards the red. This is discussed in terms of thermally activated energy‐transfer mechanisms from Tb 3+ energy states to the hybrid’s emitting levels.