Ho3+/Yb3+ codoped Vernier phase Y7O6F9 powders with efficient near-infrared quantum cutting, intense upconversion and downshifting from visible to mid-infrared

NaSr2Nb5O15:Yb3+, Ho3+, Tm3+ transparent glass ceramics: Up‐conversion optical thermometry and energy storage property

“…The emission intensity of UC is no longer continuously increased with the increase of the sensitizer concentration due to concentration quenching effect 20,45,46 . Five emission bands are observed to be attributed to the transforms of 1 G 4 → 3 H 6 , 5 S 2 , 5 F 4 → 5 I 8 , 5 F 5 → 5 I 8 , 3 F 2,3 → 3 H 6 , and 3 H 4 → 3 H 6 47,48 . Actually, Tm 3+ has a red emission band that overlaps with Ho 3+ at about 647 nm.…”

“…20,45,46 Five emission bands are observed to be attributed to the transforms of 1 G 4 → 3 H 6 , 5 S 2 , 5 F 4 → 5 I 8 , 5 F 5 → 5 I 8 , 3 F 2,3 → 3 H 6 , and 3 H 4 → 3 H 6 . 47,48 Actually, Tm 3+ has a red emission band that overlaps with Ho 3+ at about 647 nm. But compared with the strong red emission of Ho 3+ , the red emission of Tm 3+ is extremely weak and completely covered 49 .…”

Multiple fluorescence-temperature feedback in Y7O6F9:Er/Yb crystal-embedded polyacrylonitrile fibers

“…Oxyfluoride provides lower phonon energy and crystal structure inversion asymmetry and has been extensively studied as a rare-earth-doped matrix. [59][60][61][62][63][64][65][66] Wang's team has proved the superiority by exploring the emission performance in Y 7 O 6 F 9 :1%Er, 5%Yb. 66 Moreover, thermal energy levels of Er 3+ under sensitizing of Yb 3+ have also been applied for optical temperature monitoring.…”