Upconversion luminescence in Er3+/Yb3+ codoped Y2CaGe4O12

Thermal and pump power effect in SrMoO4:Er3+-Yb3+ phosphor for thermometry and optical heating

“…4 I 15/2 transitions. The two-photon absorption process is found to be responsible for the generation of the upconversion emission bands lying in the green region under NIR diode laser excitation [24,[25][26][27]. The origination of the UC emission bands and their dynamic energy migration mechanisms have been explained elsewhere [24].…”

Sensitized high-order ultraviolet upconversion emissions of Gd3+ by Er3+ in NaYF4 microcrystals

“…As one of the available approaches for achieving the short-wavelength laser radiation, frequency UC based on certain rare-earth ions (RE 3+ ) in different matrix have been investigated widely in the past two decades. However, most studies about UC emissions of RE 3+ ions have focused on the visible region, and only a few groups reported strong UV UC emissions [5][6][7][8][9][10]. Consequently, synthesizing the intense UV luminescent materials and investigating UV UC emission mechanism are the most important tasks for researchers to develop UV UC solid-state lasers.…”

Polarized spectral analysis of Er3+ ions in Er3+:LiGd(MoO4)2 crystal

“…Since the lifetime of 4 And of the Er 3+ ions in the 2 H 11/2 , 4 S 3/2 states transit to the 4 I 15/2 ground state, producing the green emissions at 518-560 nm.…”

“…Er 3+ ion has a favorable energy-level structure with 4 I 15/2 → 4 I 9/2 transition (≈800 nm) and 4 I 15/2 → 4 I 11/2 transition (≈970 nm) in the near-infrared spectral region, which allows the pumping with commercial high power semiconductor lasers. Therefore, the Er 3+ -doped bulk crystals, nano-/micro-materials and glasses have attracted more and more interest [1][2][3][4][5][6][7][8][9][10][11][12][13].…”