Abstract:

NaYF4: Er3+, Yb3+ upconversion nano luminescence powder was prepared using Lowtemperature Combustion Synthesis (LCS)method. The optimum technological parameters of the synthesis were determined as: urea amount of 200%stio, agglomeration temperature of 600 ℃ and reaction time of 8 min. XRD and TEM analysis shows that the crystal grain diameters of NaYF4: Er3+, Yb3+ powders are in 30 nm to 35 nm with hexagonal crystal structure. NaYF4: Er3+, Yb3+ has upconversion luminescence effect on wavelength near 900 nm, and there are five peaks in the upconversion emission spectrum, which appear at 380 nm, 408 nm, 522 nm, 540 nm and 658 nm respectively. The relation between luminescent intensity and pump power indicates that 380 nm and 408 nm emissive purple light belongs to threephoton process; and 522 nm, 540 nm and 658 nm emissions belong to twophoton process.

Key words: nonmetallic inorganic material, upconversion luminescence powder, lowtemperature combustion synthesis method(LCS), nanometer, rareearth