The nanostructure and photoluminescence of polycrystalline Er-doped Y2 O3 thin films, deposited by radical-enhanced atomic layer deposition (ALD), were investigated in this study. The controlled distribution of erbium separated by layers of Y2 O3, with erbium concentrations varied from 6 to 14 at. %, was confirmed by elemental electron energy loss spectroscopy (EELS) mapping of Er M4 and M5. This unique feature is characteristic of the alternating radical-enhanced ALD of Y2 O3 and Er2 O3. The results are also consistent with the extended x-ray absorption fine structure (EXAFS) modeling of the Er distribution in the Y2 O3 thin films, where the EXAFS data were best fitted to a layer-like structure. X-ray diffraction (XRD) and selected-area electron diffraction (SAED) patterns revealed a preferential film growth in the  direction, showing a lattice contraction with increasing Er doping concentration, likely due to Er3+ of a smaller ionic radius replacing the slightly larger Y3+. Room-temperature photoluminescence characteristic of the Er3+ intra- 4f transition at 1.54 μm was observed for the 500 Å, 8 at. % Er-doped Y2 O3 thin film, showing various well-resolved Stark features due to different spectroscopic transitions from the I 132 4 → I 152 4 energy manifold. The result indicates the proper substitution of Y3+ by Er3+ in the Y2 O3 lattice, consistent with the EXAFS and XRD analyses. Thus, by using radical-enhanced ALD, a high concentration of optically active Er3+ ions can be incorporated in Y2 O3 with controlled distribution at a low temperature, 350 °C, making it possible to observe room-temperature photoluminescence for fairly thin films (∼500-900 Å) without a high temperature annealing.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)