Laser heating effect on the power dependence of upconversion luminescence in Er3+-doped nanopowders
Source abstract
Abstract
Under 980-nm laser diode excitation, a phenomenon on an over-2-slope in log(I)-versus-log(P) plot for red upconversion (UC) luminescence in Er3+-doped nanopowders is usually observed. Due to the existence of many energy-trapping centers on their surfaces, the laser heating effect is shown very prominently in these nanopowders. In this submission, the influence of laser heating on the power dependence of UC luminescence in NaGdF4:Er3+/Yb3+@Citrate nanopowders is investigated. In the experimental works, sub-20-nm β-NaGdF4:Er3+/Yb3+@Citrate nanoparticles were synthesized at 185 °C through a solvothermal route. Then we found that UC luminescence at 524 and 657 nm displayed an over-2-slope in log(I)-versus-log(P) plot. The over-2-slope for 524-nm UC luminescence can be well explained from the greater proportion of population at the 2H11/2 level, which is thermally populated from the 4S3/2 level, with increase of the excitation power. Cross relaxation of 2H11/2 + 4I13/2 → 4F9/2 + 4I11/2 is proposed to feed 4F9/2 from 2H11/2 levels, which explains the over-2-slope in log(I)-versus-log(P) plot for red two-photon UC luminescence.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Luminescence and Fluorescent Materials · Radiation Detection and Scintillator Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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