Abstract
We reported the first observation of the two-photon-induced quantum cutting phenomenon in a Gd3+/Tb3+-codoped glass in which two photons at ~400 nm are simultaneously absorbed, leading to the cascade emission of three photons in the visible spectral region. The two-photon absorption induced by femtosecond laser pulses allows the excitation of the energy states in Gd3+ which are inactive for single-photon excitation and enables the observation of many new electric transitions which are invisible in the single-photon-induced luminescence. The competition between the two-photon-induced photon cascade emission and the single-photon-induced emission was manipulated to control the luminescence color of the glass. We demonstrated the change of the luminescence color from red to yellow and eventually to green by varying either the excitation wavelength or the excitation power density.
Highlights
In rare-earth-ion-doped materials, Tb3+-doped glasses have been the focus of many studies because of their high luminescence efficiency at around 550 nm which is convenient for direct coupling with silicon detectors[45]
It is expected that one can manipulate the competition between the cascade emission and conventional emission and control the luminescence color by varying λex or Pex, exploring its applications in color display[52]
The proposed scheme was examined by using different glasses codoped with Gd3+ and Tb3+ and the dependence of luminescence color on λex and Pex was found to be a popular phenomenon
Summary
In rare-earth-ion-doped materials, Tb3+-doped glasses have been the focus of many studies because of their high luminescence efficiency at around 550 nm which is convenient for direct coupling with silicon detectors[45]. Fs laser light at 800 nm has been used to excite the three-photon-induced luminescence in rare-earth-ion-doped glasses[37]. When fs laser light at 400 nm is used to excite the levels 6GJ in Gd3+, the level 5D3 in Tb3+ with a wavenumber of ~26336 cm−1 (corresponding to a wavelength of ~381 nm) can be populated through Rabi oscillation or phonon-assisted transition[51], leading to the conventional emission from Tb3+. For excitation wavelengths (λex) shorter than 400 nm, the population probability for the levels 6GJ is reduced while that for the level 5D3 is increased It implies the existence of a competition between the cascade emission and conventional emission that depends strongly on λex. It is expected that one can manipulate the competition between the cascade emission and conventional emission and control the luminescence color by varying λex or Pex, exploring its applications in color display[52]
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