Strong photoluminescence through up and down conversion in Tm(3+)/Ho(3+):LaOF nanoparticles.
Efficient up and down frequency conversions in Tm(3+) and Ho(3+) doped LaOF tetragonal nanocrystals have been investigated. Bright fluorescence emissions are obtained in co-doped Tm(3+)/Ho(3+):LaOF tetragonal nanocrystals through UV and infrared excitation. Green florescence from doped Ho(3+) ions, which can be clearly seen with bared eyes, is obtained when Tm(3+) ion is excited. Specific mechanism of the cross relaxation between doped ions is explored through spectroscopic measurements in time and frequency domains. About 90% energy transfer efficiency is obtained when the weak radiative and nonradiative relaxations are neglected.
College of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062 P. R. China.
Dangli
D
Gao
Hairong
H
Zheng
Yu
Y
Tian
Min
M
Cui
Yu
Y
Lei
Enjie
E
He
Xisheng
X
Zhang