Single-phase white-emitting phosphors based on apatite-type gadolinium silicate, Gd_9.33(SiO₄)₆O₂ doped with Dy³⁺, Eu³⁺ and Tb³⁺

Abstract

Two series of new apatite-type silicate materials were synthesised and characterised with the aim of achieving white light emission from single-phase phosphors.

VUV–UV–vis Luminescence, Energy Transfer Dynamics, and Potential Applications of Ce3+- and Eu2+-Doped CaMgSi2O6

“…LaPO 4 :Ce 3+ , Tb 3+ and GdMgB 5 O 10 :Ce 3+ , Tb 3+ have been commercial green-emitting phosphors in three-band lamps. The in-depth investigation on energy transfer is undoubtedly helpful to understand the luminescence processes and analyze how to extend the appropriate excitation wavelength to improve the luminescence efficiency. , …”

Narrow-band red phosphors of high colour purity based on Eu3+-activated apatite-type Gd9.33(SiO4)6O2

“…This demonstrates that apatite-type gadolinium silicates can be heavily doped with Eu 3+ to achieve intense emission, more so than Sr 2(1Àx) Eu 2x ZnGe 2 O 7 , for which high emission intensity is retained only to x = 0.05, 41 or NaSrLa 1Àx (MO 4 ) 3 , where the highest emission intensity was found at x = 0.008 and x = 0.010 for M = Mo and W respectively. 42 The Eu 3+ 5 25 with lifetimes of 0.9 to 1.3 ms and 1.28 to 1.39 ms, respectively. The lifetime decreases for Eu 3+ x 4 0.93, which is consistent with the observed intensity decrease for such compositions, and confirms that the drop-off in intensity is due to excited-state quenching (Fig.…”

“…24 Its suitability as a host has already been reported in studies of white-emitting phosphors. [25][26][27][28][29][30][31][32] The series of red phosphors prepared in this work adopt the general formula Gd 9.33Àx Eu x (SiO 4 ) 6 O 2 (with x = 0.03, 0.05, 0.07, 0.09, 0.19, 0.28, 0.47, 0.65, 0.93, 1.40 and 1.87, corresponding to a maximum of 20 at% Eu 3+ doping). Variable temperature powder X-ray diffraction (PXRD) and optical measurements were used to probe the structural and luminescence behaviour of the materials, with the aim of investigating concentration and thermal quenching, emission efficiency and colour purity.…”

Highly thermostable white-emitting Ca9ZnK(PO4)7:Ce3+,Dy3+ single-phase phosphor with tunable photoluminescence and energy transfer

“…However, the method is closely dependent on the symmetry site of Dy 3+ . 20 The sensitizer → activator (Dy 3+ ) energy transfer has become increasingly used because among the rare earth family, the classical 5d → 4f transitions of Ce 3+ ion cover the ultraviolet to blue light region, which overlaps well with the 4f excitation of Dy 3+ ion. 21,22 Thus, Ce 3+ can be used as a sensitizer for transferring energy to Dy 3+ .…”