ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Hexagonal NaYF4:Ln3+ (Ln3+=Yb3+ and Tm3+) was prepared via solid-state synthesis route.The synthesized powders were identified with X-ray diffraction patterns. Hexagonal phase was obtainedby heating the powders at 550ºC in reducing atmosphere, and the ions of Yb3+ and Tm3+ were completelyincorporated into the lattice of hexagonal NaYF4 in the doping concentration range. Microstructure of thephosphor was observed by scanning electron microscopy (SEM). Intense blue (1G4→3H6, 1D2→3F4) andweak red (1G4→3F4) upconversion emission of Tm3+ ions with the energy transferred from Yb3+ ions wereobserved in the phosphor excited with a 980nm continuous wave laser diode. The intensity of blueemission was effectively enhanced by suitable doping of Tm3+ and Yb3+ ions, and strongest blue emissionwas obtained with the concentration of 0.2mol% Tm3+ and 40mol% Yb3+ doped
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.398.pdf
