Optical properties of Er^(3+) doped KYb_xF_(3x+1)(x=2, 3) upconverting nanoparticles

摘要

Well dispersed orthorhombic structure KYb2F7:2 mol.%Er3+ and KYb3F10:2 mol.%Er3+ nanoparticles were synthesized through solvothermal method. Measurements of X-ray diffraction(XRD), transmission electron microscopy(TEM) and upconversion spectra showed excellent morphology and optical properties of the as-prepared samples. The intensity ratio of the red emission(650 nm) to the green emission(545 nm) in these two materials was much stronger than that in other Er3+ doped materials. The transition mechanism of the processes was investigated and discussed. Due to their strong red emission, the samples are promising for applications in display, color tuning, and biolabeling.