Synthesis and properties of Ca3Ga2Ge3O12:Tb3+ garnet phosphor

Review—Temperature Dependence of Transition-Metal and Rare-Earth Ion Luminescence (Mn4+, Cr3+, Mn2+, Eu2+, Eu3+, Tb3+, etc.) II: Experimental Data Analyses

“…The PL and PLE spectra were measured by excitation at λ ex = 266 nm (PL) and by monitoring at λ em ∼ 544 nm (PLE). 56 The series of the sharp PL peaks at λ em ∼ 480 − 700 nm in Fig. 16b correspond to the 4 f 8 ( 5 D 4 )→4 f 8 ( 7 F J ) transitions in Tb 3+ .…”

“…The decay times are also observed to be very long in the milliseconds range. 56 Weak multiple absorption peaks at ∼330 − 450 nm in Fig. 16b are due to the 7 F 6 → 5 D J transitions with J = 0 − 4.…”

Study of the luminescence of Eu2+ and Eu3+ states in Ca3Ga2Ge3O12:Eu garnet using synchrotron radiation excitation

“…It is worth to note that some deviation in the position of the Eu 2þ emission bands in the 450-465 nm range in the normalized spectra of Ca 3 Ga 2 Ge 3 O 12 :Eu ceramics under excitation by SR with different energies ( Fig. 2b) can be caused by some overlapping of the Eu 2þ emission band with the emission band of defect related centers peaked approximately at 460 nm at RT [12,13] and is assumed to the luminescence of F þ centers [12]. Meanwhile, the Eu 2þ luminescence band Ca 3 Ga 2 Ge 3 O 12 :Eu ceramics and other garnet compounds possesses much wider FWHM of about 1.1 eV [16,17] than that in the case of the emission band of F þ centers with typical FWHM of about 0.3 eV (for instance.…”

“…The aim of this work is investigation of the Eu-related luminescence centers in Ca 3 Ga 2 Ge 3 O 12 garnet ceramics using synchrotron radiation (SR) excitation. Recent studies of the luminescence properties of undoped as well as Tb 3þ and Eu 3þ doped Ca 3 Ga 2 Ge 3 O 12 garnets were performed using conventional spectroscopic methods [12][13][14][15]. Meanwhile, the application of the synchrotron radiation excitation with energy in the 3.7 eV-25 eV range, covered partly the transparence range (E < 4.0 eV), the exciton range (4-7 eV) and the range of interband transitions (E > 7 eV) of Ca 3 Ga 2 Ge 3 O 12 host gives the unique possibility of correct investigation of the luminescent properties of the different kinds of dopant in this garnet.…”

Preparation and luminescence properties of Tb3+‐doped garnet Y2Mg2Al2Si2O12 luminescent materials

“…[ 6 ] Among various inorganic luminescent materials, garnets with a general formula of A 3 B 2 C 3 O 12 in which A represents atoms located at 24(c) sites with eight‐fold dodecahedral coordination, B represents atoms located at 16(a) sites with six‐fold octahedral coordination, and C represents atoms located at 24(d) sites with four‐fold tetrahedral coordination, [ 7 ] have been widely investigated since the garnet Y 3 Al 5 O 12 :Ce 3+ was first reported by Blass and Bril in 1967 for application in the flying‐spot cathode‐ray tube. [ 8 ] To date, large numbers of rare earth ions‐doped garnet luminescent materials except for Y 3 Al 5 O 12 :Ce 3+ have been synthesized and investigated, these include Lu 3 MgAl 3 SiO 12 :Ce 3+ , [ 9 ] Ca 2 YHf 2 Al 3 O 12 :Ce 3+ , [ 10 ] Tb 3 Al 5 O 12 :Ce 3+ , [ 11 ] Tb 3 Ga 5 O 12 :Eu 3+ , [ 12 ] Li 3 Gd 3 Te 2 O 12 :Eu 3+ , [ 13 ] Ca 2 YZr 2 Al 3 O 12 :Eu 3+ , [ 3 ] Ca 3 Ga 2 Ge 3 O 12 :Tb 3+ , [ 14 ] Lu 2 MgAl 4 SiO 12 :Eu 2+ , Ce 3+ , Mn 2+ , [ 15 ] Y 2 Mg 2 Al 2 Si 2 O 12 :Eu 2+ , [ 16 ] and Y 2 Mg 2 Al 2 Si 2 O 12 :Eu 3+ . [ 17 ]…”