Three-photon indirect sensitization in green upconversion luminescence of Er/Tm codoped NaY(WO(4))(2) crystal.
Upconversion spectra of Er/Tm codoped NaY(WO(4))(2) crystal excited by 974nm laser is investigated. Intensive 520nm/550nm and 800nm emissions are observed. Three-photon process at high pumping power is presented in the green upconversion. A model is proposed that the three-photon process is actualized by the energy indirect sensitization between two Er(3+) ions and one Tm(3+) ion, via excited state absorption and two cross relaxations. Two Er(3+) ions totally absorb three 974nm photons, emitting one green photon, and Tm(3+) ion plays the role of temporary energy storage in this process.
Zhang
Kang
K
Song
Feng
F
Su
Jing
J
Han
Lin
L
Liang
Jing
J
Zhang
Xuezhi
X
Yan
Lihua
L
Tian
Jianguo
J
Xu
Jingjun
J