TY - JOUR
T1 - Temperature-dependent six-photon upconversion fluorescence of Er 3+
AU - Zheng, Kezhi
AU - Zhao, Dan
AU - Zhang, Daisheng
AU - Liu, Ning
AU - Qin, Weiping
PY - 2011/1
Y1 - 2011/1
N2 - Yb3+/Er3+ codoped β-NaYF4 microcrystals were synthesized through a facile EDTA-assisted hydrothermal method. Under 980 nm excitation, 244, 256, and 276 nm upconversion (UC) emissions were observed in NaYF4:Yb3+/Er3+ microcrystals, which were assigned to the 2I11/2 → 4I15/2, 4D7/2 → 4I15/2, and 4G9/2 → 4I15/2 transitions of Er3+ ions, respectively. Successive energy transfers (ETs) from Yb3+ to Er3+ played crucial roles in populating the high-energy states of Er3+ ions. Power dependence analysis exhibited that 244 and 256 nm UC emissions came from six-photon processes. Temperature-dependent UC emissions of 4D 7/2 → 4I15/2 and 2I 11/2 → 4I15/2 transitions of Er 3+ were discussed and the nonradiative relaxation (NR) process of 2I11/2 → 4D7/2 was confirmed.
AB - Yb3+/Er3+ codoped β-NaYF4 microcrystals were synthesized through a facile EDTA-assisted hydrothermal method. Under 980 nm excitation, 244, 256, and 276 nm upconversion (UC) emissions were observed in NaYF4:Yb3+/Er3+ microcrystals, which were assigned to the 2I11/2 → 4I15/2, 4D7/2 → 4I15/2, and 4G9/2 → 4I15/2 transitions of Er3+ ions, respectively. Successive energy transfers (ETs) from Yb3+ to Er3+ played crucial roles in populating the high-energy states of Er3+ ions. Power dependence analysis exhibited that 244 and 256 nm UC emissions came from six-photon processes. Temperature-dependent UC emissions of 4D 7/2 → 4I15/2 and 2I 11/2 → 4I15/2 transitions of Er 3+ were discussed and the nonradiative relaxation (NR) process of 2I11/2 → 4D7/2 was confirmed.
KW - Lanthanide ions
KW - Temperature-dependent
KW - Upconversion luminescence
UR - http://www.scopus.com/inward/record.url?scp=78650708073&partnerID=8YFLogxK
U2 - 10.1016/j.jfluchem.2010.10.003
DO - 10.1016/j.jfluchem.2010.10.003
M3 - Article
AN - SCOPUS:78650708073
SN - 0022-1139
VL - 132
SP - 5
EP - 8
JO - Journal of Fluorine Chemistry
JF - Journal of Fluorine Chemistry
IS - 1
ER -