Structural, optical and Judd-Ofelt analyses of Gd2-xEuxSi2O7 nanocrystals for lighting applications

A series of Eu3+-doped silicate-based red light-emitting nanocrystalline materials is fabricated via the solution combustion technique. Triclinic crystalline powders with a P-1 space group are formed containing irregularly sized grains. Three-lifetime values indicates the presence of three different local environments surrounding the Eu3+ ion. Upon near-UV excitation, the photoluminescence (PL) spectrum shows a red emission owing to the electronic band at -612 nm, consistent with the electronic transition 5D0 & RARR; 7F2. The energy bandgap is probed using diffuse reflectance spectroscopy. The critical distance between adjacent Eu3+ ions was evaluated to be -18.70 & ANGS; and multipolar exchanges were found accountable for the concentration quenching. The obtained chromaticity coordinates fall in the red regime of the CIE (1931) triangle, which replicates the potency of designated nanomaterials in the design and architecture of R-G-B (red-green-blue) phosphor-based LEDs.