Non-resonant upconversion energy transfer of crystal ErP5O14

This paper reports the upconversion luminescence phenomenon of crystal ErP5 O14 in ultraviolet to blue-green wave range induced by red DCM dye laser. T he upconversion passage of each upconversion fluorescence is confirmed. It is found that the upconversion mechanism is mainly non-resonant upconversio n energy transfers between rare earth ions when laser wavelength is near 65 0 nm. It is very interesting that the non-resonant upconversion energy tran sfer is achieved directly through a kind of coupling state of rare earth io n cluster and the ions do not exchange their phonon energy with crystal lat tice.