Luminescence properties of Tb3+–Sm3+ codoped glasses for white light emitting diodes

Abstract

Photoluminescence properties of silicate and borosilicate glasses codoped with Tb3+ and Sm3+ ions have been characterized by excitation and emission spectroscopies. When excited by ultraviolet light the glasses emit a combination of green and orange-red wavelengths giving white light. The ratio of the intensities of orange-red to green emissions can be tuned by varying both the concentration of the Sm3+ ion and an the composition of the glass matrix. The excitation and emission spectra show a self-quenching effect for the Sm3+ ions and an energy transfer from Tb3+ (D45) to Sm3+ (G5∕24).

Green-light-emitting phase in Ba3MgSi2O8:Eu2+, Mn2+ full-color phosphor for white-light-emitting diodes via addition of Si3N4

“…Many of such single-component full-color-emitting phosphors have emerge very recently, ranging from semiconducting nanocrystals [1,2], organic compound [3], complex [4,5], hybrid [6] to rare earth doped inorganic hosts [7][8][9][10][11][12][13][14][15][16][17][18][19][20] as well. As to the present interest in a full-color phosphor, A 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ (A = Ba, Sr, Ca) [21], we have identified that, a green-band-emission peaked at ∼505 nm does not originate from Ba sites in Ba 3 MgSi 2 O 8 host lattice but from those in a newly formed orthosilicate phase, Ba 2 SiO 4 [22,23].…”

Enhanced green upconversion luminescence in Yb–Tb co-doped sintered silica nanoporous glass

“…The evolution of the peak intensities as a function of pump power are plotted on log-log scale, which is shown in Fig. 4b [10]. It was confirmed from this plot that the pump power dependence of the green emission (543 nm) from the Tb 3?…”

“…decay curves could be analyzed using the well-known direct quenching mechanism [19]. Usually, the interaction scheme involves both the dipole-dipole and the dipole-quadrupole interactions, which can be described by Inokuti-Hirayama formula [10,20,21]. The rare-earth ions doped in nanoporous glass tend to accumulate at the internal surface of the nanopores and channels of porous glass; therefore, the concentration of rare-earth ions is different everywhere.…”

“…So far, appropriate host matrix for 543-nm fiber lasers and amplifiers is still to be developed. Compared with the non-silica glass systems, the silica glass has some advantages such as higher mechanical, thermal and chemical stability [10][11][12]. However, concentration quenching due to clustering of rare-earth ions and transition metal ions prevents the application of luminous silica glasses [11][12][13][14].…”

Energy transfer, tunable luminescence, and thermal stability of Tb3+–Sm3+-codoped Na3Bi(PO4)2 phosphors

“…to Sm 3? in codoped silicate and borosilicate glasses [10]. Wang Ting reported the energy transfer from Tb 3?…”