Neutral and warm white light emission in Tb3+/Sm3+ zinc phosphate
glasses
A.N. Meza-Rocha a,⇑, G. Muñoz H. a, A. Speghini b,c, M. Bettinelli b, U. Caldiño a
a b s t r a c t
A spectroscopy analysis of Tb3+ and Tb3+/Sm3+ doped zinc phosphate glasses based on emission spectra
and decay time profiles was performed. The Tb3+ singly doped glass shows a green overall emission with
x = 0.258 and y = 0.429 CIE1931 chromaticity coordinates, upon Tb3+ excitation at 318 nm. Under
co-excitations of Tb3+ and Sm3+ at 344, 361 and 374 nm, the Tb3+/Sm3+ co-doped glasses display neutral
and warm white overall emissions with CIE1931 chromaticity coordinates in ranges of x = 0.407–0.487
and y = 0.437–0.485, color temperature in the range of 2447–4024 K and quantum yield up to 12.38%,
depending on the excitation wavelength and relative amount of Tb3+ and Sm3+. In all cases, it was
observed that the Sm3+ emission is enhanced by the addition of Tb3+, which is correlated with a quenching
of the Tb3+ emission as consequence of a non-radiative Tb3+?Sm3+ energy transfer process. The
non-radiative nature of the energy transfer process was inferred by the shortening of the Tb3+ emission
decay time observed in the Tb3+/Sm3+ co-doped zinc phosphate glasses. An analysis of the Tb3+ emission
decay time profiles by the Inokuti–Hirayama model suggests that an interaction electric dipole–dipole
into the Tb3+–Sm3+ clusters might dominate in the energy transfer process with efficiency and probability
of 0.23–0.25 and 96.22–111.35 s1, respectively.
Neutral and warm white light emission in Tb3+/Sm3+ zinc phosphateglassesA.N. Meza-Rocha a,⇑, G. Muñoz H. a, A. Speghini b,c, M. Bettinelli b, U. Caldiño aa b s t r a c tA spectroscopy analysis of Tb3+ and Tb3+/Sm3+ doped zinc phosphate glasses based on emission spectraand decay time profiles was performed. The Tb3+ singly doped glass shows a green overall emission withx = 0.258 and y = 0.429 CIE1931 chromaticity coordinates, upon Tb3+ excitation at 318 nm. Underco-excitations of Tb3+ and Sm3+ at 344, 361 and 374 nm, the Tb3+/Sm3+ co-doped glasses display neutraland warm white overall emissions with CIE1931 chromaticity coordinates in ranges of x = 0.407–0.487and y = 0.437–0.485, color temperature in the range of 2447–4024 K and quantum yield up to 12.38%,depending on the excitation wavelength and relative amount of Tb3+ and Sm3+. In all cases, it wasobserved that the Sm3+ emission is enhanced by the addition of Tb3+, which is correlated with a quenchingof the Tb3+ emission as consequence of a non-radiative Tb3+?Sm3+ energy transfer process. Thenon-radiative nature of the energy transfer process was inferred by the shortening of the Tb3+ emissiondecay time observed in the Tb3+/Sm3+ co-doped zinc phosphate glasses. An analysis of the Tb3+ emissiondecay time profiles by the Inokuti–Hirayama model suggests that an interaction electric dipole–dipoleinto the Tb3+–Sm3+ clusters might dominate in the energy transfer process with efficiency and probabilityof 0.23–0.25 and 96.22–111.35 s1, respectively.
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