Công bố khoa học

A color of blue-red emission by Ce³⁺ and Sm³⁺ activated fluorophosphate glasses (PKABfNf:P₂O₅+K₂O + Al₂O₃+BaF₂+NaF₂) were successfully fabricated by using usual melt and sudden quenching method. The FTIR, SEM, EDS, luminescence spectra, the decay rates, and energy transfer (ET) mechanism in the co-doped (Ce³⁺,Sm³⁺):PKABfNf glasses were systematically investigated in detail. The luminescence spectra of co-doped glasses show broadband blue de-excitation that belongs to Ce³⁺ ions and it obviously intensify the red de-excitation of Sm³⁺ through an effective ET process. The decrease in lifetime could support the existence of ET between Ce³⁺ and Sm³⁺ in PKABfNf glasses. This ET from Ce³⁺ to Sm³⁺ can be proposed to be the interaction due to quadrupole-quadrupole, based on the Dexter's ET formula and Reisfeld's approximation. Furthermore, CIE chromaticity coordinates, color correlated temperature, color purity, ET luminous efficiency (η_ET), critical energy transfer distance (R_c), and ET parameter (Q) were calculated. The findings show that (Ce³⁺,Sm³⁺):PKABfNf glass might be a promising candidate in lighting field applications.