[Indirect sensitized upconversion in Tm3+ and Yb3+ codoped non-crystal pentaphosphate].
We report the blue upconversion luminescence of Tm3+ and Yb3+ codoped non-crystal pentaphosphate pumped by -798nm laser diode. The samples were directly excited to 3F4 level of Tm3+ ion. Two energy transfer processes between Tm3+ and Yb3+ contribute mainly to the population of 1G4 level of Tm3+. Phonon plays an important role in the upconversion process.
Feng
Y
Y
Physics Department, Nankai University, 300071 Tianjin.
Chen
X
X
Li
K
K
Song
F
F
Bi
S
S
Li
M
M
Zhang
G
G
Song
Z
Z
Meng
G
G
Sun
Y
Y