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 crystals co-doped with different concentration of Yb3+ and Er3+ ions weresynthesized via hydrothermal reaction route. The samples doped with 30mol% of Yb3+ and 1mol% of Er3+showed the highest upconversion efficiencies under 980nm excitation. Powder X-ray diffraction (XRD)analyses indicated that the samples were pure hexagonal phase. The morphology of the powder wasobserved by scanning electron microscopy (SEM). With the excitation of a 980nm diode laser, stronggreen emissions were obtained at 522, 530, 542 and 551nm in addition to weak red emission at 654nm.The green and red emissions were attributed to the transitions of 4S3/2, 2H11/2 → 4I15/2 and 4F9/2 → 4I15/2 ofEr3+ ion, respectively. The additions of Yb3+ ion as sensitizer can notably enhance the upconversionefficiencies from infra-red to visible. The upconversion mechanism of the emission for the samples wasalso discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.394.pdf
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