Comparative study of Ho:Y2O3 and Ho:Y3Al5O12 transparent ceramics produced from laser-ablated nanoparticles

Comparative spectroscopic investigation of Dy3+ ions in different sesquioxide solid solution ceramics

“…The emission cross sections of LuScO 3 :Dy, LuYO 3 :Dy, and YScO 3 :Dy at 573 nm were calculated to be 0.78, 1.10, and 0.76 × 10 −20 cm 2 , which are larger than that of Y 2 O 3 :Dy (0.57 × 10 −20 cm 2 ) 23 but lower than that of YAG:Dy ceramics (1.50 × 10 −20 cm 2 ) 11 . Due to the two factors of broader emission spectra and higher radiative transition probability of sesquioxide, the emission cross sections of Dy‐doped sesquioxide solid solution ceramics were lower than that of YAG:Dy ceramics 40 . Appropriate emission cross section indicates that Dy‐doped sesquioxide solid solution ceramics are effective for laser oscillation.…”

“…The fluorescence lifetimes of 4 F 9/2 manifold for LuScO 3 :Dy, LuYO 3 :Dy, and YScO 3 :Dy were calculated to be 104.66, 114.57, and 109.41 μs, respectively. The lower fluorescence lifetime values of Dy‐doped sesquioxide ceramics were partially referred to the higher Dy 3+ ion density in sesquioxides as compared to YAG 40 . Combined with τ rad , the fluorescence quantum efficiency can be obtained by η = τ f / τ rad , and the quantum efficiencies of LuScO 3 :Dy, LuYO 3 :Dy, and YScO 3 :Dy were calculated to be 22.71%, 23.02%, and 25.10%, respectively.…”

“…11 Due to the two factors of broader emission spectra and higher radiative transition probability of sesquioxide, the emission cross sections of Dy-doped sesquioxide solid solution ceramics were lower than that of YAG:Dy ceramics. 40 Appropriate emission cross section indicates that Dy-doped sesquioxide solid solution ceramics are effective for laser oscillation. The relatively low quantum efficiency is attributed to energy-transfer process occurring between Dy 3+ ions in the excited and nearby ground state.…”

“…The fluorescence decay curves conformed to non-exponential decay, and the mean fluorescence lifetimes (τ f ) were determined by the following equation:𝜏 f = ∫ ∞ 0 𝑡𝐼(𝑡)𝑑𝑡 ∫ ∞ 0 𝐼(𝑡)𝑑𝑡(11)where I(t) is the fluorescence intensity at t. The fluorescence lifetimes of 4 F 9/2 manifold for LuScO 3 :Dy, Fluorescence decay curves of Dy-doped sesquioxide solid solution ceramics at room temperature LuYO 3 :Dy, and YScO 3 :Dy were calculated to be 104.66, 114.57, and 109.41 μs, respectively. The lower fluorescence lifetime values of Dy-doped sesquioxide ceramics were partially referred to the higher Dy 3+ ion density in sesquioxides as compared to YAG 40. Combined with τ rad , the fluorescence quantum efficiency can be obtained by η = τ f /τ rad , and the quantum efficiencies of LuScO 3 :Dy, LuYO 3 :Dy, and YScO 3 :Dy were calculated to be 22.71%, 23.02%, and 25.10%, respectively.…”

Fabrication and Luminescence Properties of Highly Transparent Green-Emitting Ho:Y2O3 Ceramics for Laser Diode Lighting

“…Among the rare-earth ions are Ho 3+ ions, which are used for laser action at different wavelengths, from 550 to 3900 nm. For example, Ho 3+ -ion-doped polycrystalline transparent ceramics have been widely studied in 2000 nm solid-state lasers due to their 5 I 7 → 5 I 8 energy-level transitions [12][13][14]. The Ho 3+ ion is also a suitable active ion for the up-conversion laser and many researchers have focused on up-conversion emissions (for example, highly efficient up-conversion luminescence in a Ho 3+ -Yb 3+ system) [15].…”