The role of thickness on the structural and luminescence properties of YO:Ho, Yb upconversion films.

The structural, surface, and upconversion (UC) luminescence properties of YO:Ho,Yb films grown by pulsed laser deposition, for different numbers of laser pulses, were studied. The crystallinity, surface, and UC luminescence properties of the thin films were found to be highly dependent on the number of laser pulses. The X-ray powder diffraction analysis revealed that YO:Ho,Yb films were formed in a cubic structure phase with an Ia space group.