Optical properties of Eu3+ in oxyfluoroborate glass and its nanocrystalline glass

Full color photoluminescence of Tb3+/Sm3+ codoped oxyfluoride aluminosilicate glasses and glass ceramics for white light emitting diodes

“…The ED/MD ratio for A5, A5-3 and A5-5 are 0.95, 0.86 and 0.87, respectively, implying that the REI in the CaF 2 crystallites have a higher symmetric environment than that in the glass. Similar phenomena were also observed in previously reported work on Eu 3+ doped glasses, where the Eu 3+ ions were incorporated into BaF 2 crystallites, obtaining a higher symmetric local rare-earth environment in glass ceramics [26].…”

Up and down conversion fluorescence studies on combustion synthesized Yb3+/Yb2+: MO-Al2O3 (M=Ca, Sr and Ba) phosphors

“…The resulting color center may be responsible for the broad emission seen in the upconversion. Such emission from color centers has been reported in many materials by several workers [19,20,[25][26][27][28][29][30]. The dependence of the intensities on the calcination temperature is different for the 488 and the 508 nm bands (inset of Fig.…”

“…It has been conjectured that the heat treatment creates small (nano-sized) crystallites in the phosphor material which also enhance the luminescence efficiency [20]. If there are different valence states of the doped ions present in the sample or an uncontrolled dopant coexists then the luminescence spectrum becomes very complex.…”

Photoluminescence and spectral parameters of Eu3+ in sodium–aluminum–tellurite ceramics

“…It is close to the values of oxyfluoroborate and fluorophosphate glasses[31,32], while it is smaller than the rest[22,23,33,34]. This indicates a lower asymmetry and covalence environment in NAT ceramics.…”

“…in NAT ceramics is larger than those of fluoride glasses[28], LaF 3 crystals[29], together with fluorosilicate and oxyfluoroborate glass ceramics[30,31]. It is close to the values of oxyfluoroborate and fluorophosphate glasses[31,32], while it is smaller than the rest[22,23,33,34].…”