Bright red Luminescence and Triboluminescence from PMMA-Doped Polymer film Materials Supported by Eu 3+ -Triphenylphosphine Based b-Diketonate and 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene Oxide

Abstract

Herein, a new b-diketonate ligand, namely, 1-(4-(diphenylphosphino)phenyl)-4,4,5,5,5-pentafluoropentane-1,3-dione (DPPFH) has been synthesized and utilized for the construction of an antenna complex of Eu 3+ [Eu(DPPF)3(DDXPO)] in the presence of a chelating ligand, 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene oxide (DDXPO). The developed Eu 3+ compound has been well characterized and investigated the photophysical properties. The designed Eu 3+ complex displays bright red luminescence upon irradiation at the ligand-centered band at 375 nm with a quantum yield of 39% in the solid-state. Interestingly, the ternary Eu 3+ complex also exhibits brilliant triboluminescence in the daylight, which could be useful in the design of pressure and damage detection probes. In addition, the newly obtained Eu 3+ complex was embedded into a PMMA matrix to form highly luminescent films having quantum yields as high as 45–50%. These plastic materials display enhanced thermal stability as compared to parent compound. The ground state coordination geometry of the typical Eu 3+ complex was calculated using the Sparkle/RM1 model. The excellent agreement between the experimental and theoretically predicted photophysical data, attesting the efficacy of the theoretical approach implemented in the LUMPAC software (http://lumpac.pro.br)