日本語フィールド
著者:Hom Nath Luitel, R. Chand, T. Torikai, M. Yada, T. Watari題名:Highly efficient NIR-NIR upconversion in K substituted CaMoO4:Tm3+,Yb3+ for potential biomedical applications発表情報:RSC Advances 巻: 5 ページ: 17034-040キーワード:概要:抄録:We obtained highly efficient NIR to NIR (excitation by 980 nm, emission at 800 nm) upconversion in
CaMoO4:Tm3+, Yb3+, M+ (M ¼ Li, Na, K, Rb) nanocrystals synthesized by a hydrothermal method. The
XRD patterns show that they are all of tetragonal structure despite a small amount of RE3+ and M+ ion
doping. The solid solubility of lithium, sodium, potassium and rubidium ions in the CaMoO4 were found
to be 30 mol%, 20 mol%, 10 mol% and 5 mol%, respectively. The doped M+ ions affect the crystal field
symmetry around Tm3+ ions in the CaMoO4 host, which results in the change of the irradiation transition
probabilities between their transition levels and intensifies the UC intensities. Compared with
CaMoO4:Tm3+, Yb3+, the NIR to NIR upconversion emission intensity of CaMoO4:Tm3+, Yb3+, 0.10M+
nanocrystals increases 2.2, 3.3, 47 and 10 fold for Li, Na, K and Rb, respectively. The K substituted
CaMoO4:Tm3+, Yb3+ phosphor exhibited intense UC emission pumped by less than 1 mW laser power
and can have potential application in NIR to NIR photodynamic diagnosis.英語フィールド
Author:Hom Nath Luitel, R. Chand, T. Torikai, M. Yada, T. WatariTitle:Highly efficient NIR-NIR upconversion in K substituted CaMoO4:Tm3+,Yb3+ for potential biomedical applicationsAnnouncement information:RSC Advances Vol: 5 Page: 17034-040An abstract:We obtained highly efficient NIR to NIR (excitation by 980 nm, emission at 800 nm) upconversion in
CaMoO4:Tm3+, Yb3+, M+ (M ¼ Li, Na, K, Rb) nanocrystals synthesized by a hydrothermal method. The
XRD patterns show that they are all of tetragonal structure despite a small amount of RE3+ and M+ ion
doping. The solid solubility of lithium, sodium, potassium and rubidium ions in the CaMoO4 were found
to be 30 mol%, 20 mol%, 10 mol% and 5 mol%, respectively. The doped M+ ions affect the crystal field
symmetry around Tm3+ ions in the CaMoO4 host, which results in the change of the irradiation transition
probabilities between their transition levels and intensifies the UC intensities. Compared with
CaMoO4:Tm3+, Yb3+, the NIR to NIR upconversion emission intensity of CaMoO4:Tm3+, Yb3+, 0.10M+
nanocrystals increases 2.2, 3.3, 47 and 10 fold for Li, Na, K and Rb, respectively. The K substituted
CaMoO4:Tm3+, Yb3+ phosphor exhibited intense UC emission pumped by less than 1 mW laser power
and can have potential application in NIR to NIR photodynamic diagnosis.