Abstract
Upon 300 nm excitation, monoclinic Lu2–xYbxWO6 (0 ≤ x ≤ 0.3) phosphors displayed concentration-dependent visible (vis) and near-infrared (NIR) luminescence with the strongest peak centers at about 450 and 970 nm. Rietveld refinement indicated that Yb occupancy numbers in three Lu sites depended closely on the impurity concentration. The scanning electron microscopy and transmission electron microscopy characterizations showed that all of the samples were aggregates of particles with different shapes and sizes. Through hybridized density functional theory calculation, this NIR emission was proposed to originate from electron transition in three unoccupied spin down 4f state of Yb3+ with different energy positions in the forbidden band. Energy transfer from WO66– to Yb3+ was only a single-step transfer process according to a lifetime spectra and theoretical result. Therefore, Lu2–xYbxWO6 can be used as light–light conversion layer in solar cell, and the first-principles calculation successfully explained th...
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
