Abstract
A broadband upconversion luminescence was observed from Mo-doped titania under a 978 nm diode laser excitation. The luminescence has been assigned to the transitions from the excited states 3T1, 3T2 to the ground state 1A1 of the [MoO4]2- radicle. The intermediate states available for upconversion are supposed to be related with Mo4+ and/or Mo5+ species. The temporal evolution of the upconversion luminescence and the excitation-power dependence of the steady-state emission intensity exhibit the typical fingerprint of a photon avalanche. The dynamical process is well described using the fluorescence 'transfer function' model.
Original language | English |
---|---|
Pages (from-to) | 205-210 |
Number of pages | 6 |
Journal | Chemical Physics Letters |
Volume | 366 |
Issue number | 3-4 |
DOIs | |
State | Published - 10 Dec 2002 |
Externally published | Yes |