Luminescence and Judd-Ofelt analysis of gallium aluminum gadolinium yttrium borate scintillating glass doped with Dy3+

Na2O-Gd2O3-Al2O3-P2O5 glass scintillator doped with Dy3+: X-rays and proton responses

“…The emission spectra under Gd 3+ excitation (λ Ex = 275 nm) in Fig. 5(b) represent the intensely sharp peak of Gd 3+ at 311 nm ( 6 P 7/2 → 8 S 7/2 ), 1,2,7,8,11,12) which matched to the excitation peak at 312 nm ( ) and 752 ( 4 F 9/2 → 6 H 9/2 ) nm 1,[7][8][9][10][11][12]21) were also observed and they were weak compared to Gd 3+ emission. After the excited Gd 3+ ion lowered its energy level from 6 I 7/2 to 6 P 7/2 by non-radiative relaxation (NR), the energy transfer (ET) then occurred from 6 P 7/2 of Gd 3+ to 4 L 19/2 of Dy 3+ as shown in Fig.…”

“…Especially the absorption at 317 nm (average) inside this board hump, possibly originated from the 8 S 7/2 → 6 P 7/2 transition of the Gd 3+ ion. 1,2,8,11,12) The Dy 3+ 8,9,12) The dominance of this absorption transition revealed the low-symmetric environment around Dy 3+ in the glass structure. The strength of most absorption peaks for Dy 3+ tends to increase with added Dy 2 O 3 content.…”

“…There are many excitation peaks of Gd 3+ and Dy 3+ in the spectra. The excitation peaks at 246, 253 and 275 nm corresponded to the Gd 3+ transitions, 8 S 7/2 → 6 D 7/2 , 6 D 9/2 and 6 I 7/2 , respectively 1,2,7,8,11,12) those revealed the energy transfer from Gd 3+ 1,[7][8][9][10][11][12]21) The strongest excitation wavelength (λ Ex ) for Gd 3+ and Dy 3+ ion was 275 Table I. List of the band assignments for FTIR spectra.…”

“…Furthermore, the gadolinium (Gd 3+ ) ion in this glass owned a highly effective atomic number that can efficiently interact with the radiation and transfer such radiation energy to RE 3+ for luminescence. 1,2,7,8,11,12) This host glass was then doped with cerium (Ce 3+ ) 14) and praseodymium (Pr 3+ ) ion as in our previous works which performed the good luminescence. 13) In this work, we developed a new glass, Dy 3+ :Na 2 O-Al 2 O 3 -Gd 2 O 3 -P 2 O 5 (Dy:NAGP), to study the physical, optical, and chemical bonding, and different types of luminescence properties.…”