Near infrared fluorescence and energy transfer in Ce/Nd Co-doped CaxSr1−xS

Efficient Near‐Infrared Emission of Ce3+–Nd3+ CoDoped (Sr0.6Ca0.4)3(Al0.6Si0.4)O4.4F0.6 Phosphors for c‐Si Solar Cell

“…The main excitation peaking at around 440 nm is coincident with the Vis PLE section. It can be sure that the 440 nm excitation belongs to Ce 3+ , and the energy‐transfer process really exists in this Ce 3+ ,Nd 3+ codoped system …”

“…It can be sure that the 440 nm excitation belongs to Ce 3+ , and the energy-transfer process really exists in this Ce 3+ , Nd 3+ codoped system. 27,28 To further study the energy-transfer process, samples with different concentrations of Nd 3+ were prepared. Figure 4(a) shows the visible PL spectra of (Sr 0.592Àx Ca 0.4 ) 3 (Al 0.6 Si 0.4 ) O 4.424+3x F 0.576À3x : 0.024Ce 3+ ,3xNd 3+ under 440 nm excitation.…”

Preparation and Application of Strong Near‐Infrared Emission Phosphor Sr3SiO5:Ce3+,Al3+,Nd3+

“…The concentration of Ce 3+ is fixed at 0.025 mol, concentrations of Nd 3+ are adjusted from 0.005 to 0.045 mol, meanwhile, Al 3+ ‐doped concentrations are adjusted to the sum of Ce 3+ (0.025 mol) and Nd 3+ (0.005–0.045 mol). Figure shows the visible PL spectra of Sr 2.975− x Si 0.975− x Al 0.025+ x O 5 :0.025Ce 3+ , x Nd 3+ under 410 nm excitation, the intensities of emission at ~522 nm of Ce 3+ ion decrease with increasing the concentration of Nd 3+ , implying the ET process from Ce 3+ to Nd 3+ …”