Synthesis and upconversion luminescence properties of NaYF4:Yb3+/Er3+ microspheres

Synthesis and upconversion luminescence properties of NaYF4:Yb3+/Er3+ microspheres

O6; Cubic NaYF4:yb3+(20%)/Er3+(1%) microspheres were synthesized by EDTA-assisted hydrothermal method. Under 980 nm exci-tation, ultraviolet (4G11/2→4I15/2), violet (2H9/2→4I15/2), grogn (4F7/2→4I15/2, 2H11/2→4I15/2, and 4S3/2→4I15/2), and red (4F9/2→4I15/2) upconversion fluorescence were observed....

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Veröffentlicht in:Journal of rare earths 2009-06, Vol.27 (3), p.394-397
Hauptverfasser: WANG, Guofeng, QIN, Weiping, WANG, Lili, WEI, Guodong, ZHU, Peifen, ZHANG, Daisheng, DING, Fuheng
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container_end_page 397
container_issue 3
container_start_page 394
container_title Journal of rare earths
container_volume 27
creator WANG, Guofeng
QIN, Weiping
WANG, Lili
WEI, Guodong
ZHU, Peifen
ZHANG, Daisheng
DING, Fuheng
description O6; Cubic NaYF4:yb3+(20%)/Er3+(1%) microspheres were synthesized by EDTA-assisted hydrothermal method. Under 980 nm exci-tation, ultraviolet (4G11/2→4I15/2), violet (2H9/2→4I15/2), grogn (4F7/2→4I15/2, 2H11/2→4I15/2, and 4S3/2→4I15/2), and red (4F9/2→4I15/2) upconversion fluorescence were observed. The number of laser photons absorbed in one upconversion excitation process, n, was determined to be 3.89, 1.61, 2.55, and 1.09 for the ultraviolet, violet, green, and red emissions, respectively. Obviously, n=3.89 indicated that a four-photon process was involved in populating the 4G11/2 state, and n=2.55 indicated that a three-photon process was involved in populating the 4F7/2/2H4S3/2 levels. For the violet and red emissions, the population of the states 2H9/2 and 4F9/2 separately came from three-photon and two-photon proc-esses. The decrease of n was well explained by the mechanism of competition between linear decay and upconversion processes for the de-pletion of the intermediate excited states.
doi_str_mv 10.1016/S1002-0721(08)60258-6
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Under 980 nm exci-tation, ultraviolet (4G11/2→4I15/2), violet (2H9/2→4I15/2), grogn (4F7/2→4I15/2, 2H11/2→4I15/2, and 4S3/2→4I15/2), and red (4F9/2→4I15/2) upconversion fluorescence were observed. The number of laser photons absorbed in one upconversion excitation process, n, was determined to be 3.89, 1.61, 2.55, and 1.09 for the ultraviolet, violet, green, and red emissions, respectively. Obviously, n=3.89 indicated that a four-photon process was involved in populating the 4G11/2 state, and n=2.55 indicated that a three-photon process was involved in populating the 4F7/2/2H&lt;11/2&gt;4S3/2 levels. For the violet and red emissions, the population of the states 2H9/2 and 4F9/2 separately came from three-photon and two-photon proc-esses. The decrease of n was well explained by the mechanism of competition between linear decay and upconversion processes for the de-pletion of the intermediate excited states.</abstract><doi>10.1016/S1002-0721(08)60258-6</doi><tpages>4</tpages></addata></record>
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title Synthesis and upconversion luminescence properties of NaYF4:Yb3+/Er3+ microspheres
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