Three-step fine-tuning by doping Bi3+, Tb3+ and Eu3+/Sm3+ in Gd2MoB2O9 host for accurate white emission

Two new rare-earth oxyborates Ba4BiTbO(BO3)4 and Ba1.54Sr2.46BiTbO(BO3)4 and luminescence properties of the Ba4BiTb1−xEuxO(BO3)4 phosphors

“…Thus, the obtained Δ E value of 0.281 eV for λ ex = 377 nm is greater than that of 0.156 eV for λ ex = 349 nm, and both are comparable to those of several previously reported Bi 3+ /Tb 3+ /Eu 3+ co-doped phosphors, such as Ca 2.24 ZrSi 2 O 9 :0.17Eu 3+ , 0.09Bi 3+ , 0.50Tb 3+ (Δ E = 0.195 eV), Gd 1.474 MoB 2 O 9 :0.30Bi 3+ , 0.20Tb 3+ , 0.026Eu 3+ , (Δ E = 0.17 eV) and LaMoBO 6 :0.4Tb 3+ , 0.005Eu 3+ , 0.02Bi 3+ (Δ E = 0.19 eV). 30,31,71…”

“…Thus, the obtained DE value of 0.281 eV for l ex = 377 nm is greater than that of 0.156 eV for l ex = 349 nm, and both are comparable to those of several previously reported Bi 3+ /Tb 3+ /Eu 3+ co-doped phosphors, such as Ca 2.24 ZrSi 2 -O 9 :0.17Eu 3+ , 0.09Bi 3+ , 0.50Tb 3+ (DE = 0.195 eV), Gd 1.474 MoB 2 -O 9 :0.30Bi 3+ , 0.20Tb 3+ , 0.026Eu 3+ , (DE = 0.17 eV) and LaMoBO 6 :0.4Tb 3+ , 0.005Eu 3+ , 0.02Bi 3+ (DE = 0.19 eV). 30,31,71 This phosphor exhibits strong temperature sensitization when excited at 377 nm, and its CIE coordinates shi signicantly from (0.4540, 0.4052) to (0.2891, 0.3308) as the temperature increases from 303 to 483 K, indicating its potential application in temperature sensing. Fig.…”

“…Consequently, Bi 3+ can also be used as a blue-emitting center to combine with Tb 3+ and Eu 3+ ions to obtain single-composition white phosphors, and some reported examples include b-GdB 3 O 6 :Bi 3+ , Tb 3+ , Eu 3+ , Ca 3 ZrSi 2 O 9 :Bi 3+ , Tb 3+ , Eu 3+ , Gd 2 MoB 2 O 9 :Bi 3+ , Tb 3+ , Eu 3+ and NaYGeO 4 :Bi 3+ /Tb 3+ /Eu 3+ . [29][30][31][32] However, doping with three ions such as Bi 3+ , Tb 3+ , and Eu 3+ can lead to complicated energy transfer, so tuning to accurate white color remains still a challenge.…”