... NaYF4: Yb, Tm, Nd @NaYF4: Nd (Y -Nd solid) and NaYF4: Yb, Tm, Nd @NaYF4: Nd -TiO2 hybrid (Y -Nd+ Ti solid) under 794 nm excitation 61 Figure 3.9 NIR photocatalytic activity of NaYF4: Yb /Tm, /Nd @NaYF4: Nd, ... Property of NaYF4: Yb, Tm, Nd @NaYF4: Nd -TiO2 colloidal spheres 58 3.4.3 NIR- responsive Photocatalytic Activity (794 nm) of NaYF4: Yb, Tm- TiO2 Colloidal Spheres 62 3.5 Summary and ... NaYF4: Yb /Tm, /Nd @NaYF4: Nd, TiO2, mix material of NaYF4: Yb /Tm/ Nd @NaYF4: Nd and TiO2, and NaYF4: Yb /Tm/ Nd @NaYF4: Nd -TiO2 colloidal spheres (794 nm) 63 XI XII LIST OF ABBREVIATION AND SYMBOLS CW continuous...