Photoluminescence Properties of Color‐Tunable Ca₃La₆(SiO₄)₆: Ce³⁺, Tb³⁺ Phosphors

Abstract

A series of newly developed color‐tunable Ca3La6(SiO4)6: Ce3+, Tb3+ phosphors were successfully prepared in this study. The crystal structures of the prepared phosphors were revealed to be hexagonal with space group P63/m, and the lattice parameters were evaluated via utilizing the Rietveld refinement method. Upon excitation at 288 nm, the emission spectra of Ce3+and Tb3+ ions co‐doped Ca3La6(SiO4)6 phosphors included a blue emission band and several emission lines. The blue emission band with a peak at 420 nm originated in the f–d transitions of Ce3+ ions, and the emission lines in the range of 450–650 nm were assigned to the 5D4 → 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions. Increasing the doping content of Tb3+ ions considerably strengthened Tb3+ emission and reduced Ce3+ emission owing to the energy transfer from Ce3+ to Tb3+ ions. The mechanism of the energy transfer was confirmed to be a dipole–dipole interaction. The effective energy transfer from Ce3+ to Tb3+ ions caused a color shift from purplish‐blue to yellowish‐green. Color‐tunable Ca3La6(SiO4)6: Ce3+, Tb3+ phosphors have the potential to be utilized in light‐emitting diodes with proper modulation of the amount of Tb3+ ions.

Synthesis, Luminescence Properties, and Energy Transfer in KMg4(PO4)3:Ce3+, Tb3+Phosphors

“…For instance, com- pared with Ca 3 La 6 (SiO 4 ) 6 , free oxygen ions enter in the tunnels of Ca 4 Y 6 (SiO 4 ) 6 O, Ca 2 La 8 (SiO 4 ) 6 O 2 and Ca 4 La 6 (SiO 4 ) 4 (PO 4 ) 2 O 2 to neutralize the excess of positive charges. 17,[23][24][25] In this paper, a similar phenomenon is suggested for K 1-x Mg 4 (PO 4 ) 3 :xCe 3+ . The tunnel of Ce 3+ -doped K 1-x Mg 4 (PO 4 ) 3 is shown in Fig.…”

Tunable Luminescence and Energy Transfer in Novel Blue-Green-Emitting BaGd2Si3O10:Ce3+,Tb3+ Phosphors for Near-UV-Based White LEDs

“…8,10 Among the host materials for phosphors, silicates are found to be suitable for the doping of RE 3+ ions because of their high thermal and chemical stability, high thermal expansion, abundant resources, weather resistance, structural diversity, etc. 11,12 Recently, few works have been reported on Ce 3+ -and Tb 3+ -co-doped blue-green silicate phosphors for lighting applications. For instance, Lu et al studied the luminescence and energy transfer properties of BaMg 2 Al 6 Si 9 O 30 :Ce 3+ ,Tb 3+ phosphors for LED applications.…”

Enhancing emission intensity and thermal stability by charge compensation in Sr2Mg3P4O15:Eu3+

“…As more and more phosphors are used in the light emitting devices, the emitting stability of phosphors with the temperature increasing is an important parameter to measure the practical applications . Figure displays the normalized temperature‐dependent emission intensity of the as‐prepared Sr 1.6 Mg 3 P 4 O 15 :0.40Eu 3+ , Sr 1.2 R 0.4 Mg 3 P 4 O 15 :0.40Eu 3+ (R + = Li + , Na + , K + ), Sr 1.6 Mg 3 P 3.6 Si 0.4 O 15 :0.40Eu 3+ , and Sr 1.4 Mg 3 P 4 O 15 :0.40Eu 3+ samples under 393 nm excitation in the temperature range of 298‐498 K. It could be seen that the luminescence intensity of all the samples exhibited decreasing tendency with increasing temperature.…”

“…In view of the wide range of practical applications of phosphors, it is necessary for phosphors to equip with good luminescence intensity and thermal stability. Currently, a revolutionary increasing number of works have been given attention to the aspect: constructing energy transfer among rare‐earth ions such as Ce 3+ /Tb 3+ /Eu 2+ /Mn 2+ or modifying coordination environment via substituting the ions of lattice . In addition, charge compensation is another effective way to improve the luminescence intensity and thermal stability of phosphors .…”