Solid Solution Formation and Ce[sup 3+] Luminescence in Silicate Garnets

Ce3+-Doped garnet phosphors: composition modification, luminescence properties and applications

“…Since garnet structure compounds are stable from chemical and photochemical points of view, phosphors possessing a garnet crystal structure generally show high stability. Moreover, the garnet crystal structure generates a strong crystal field strength on the dodecahedral site where the Ce 3+ ions are incorporated and therefore, the d-f emission is shifted to the green, [26][27][28][29]81 yellow, 1 or even orange-red [37][38][39] spectral region depending on the lattice composition.…”

“…118 Such a charge-balanced substitution with aliovalent cations allows for a stable single-phase structure of the doubly-substituted garnet and has been extensively reported by Katelnikovas, Setlur and Maniquiz. [34][35][36][37][38]119,120 The coordination for the dodecahedral site for Ce 3+ changes as a result of the substitution and it will induce color-tunable luminescence from Ce 3+ in garnet phosphors. , respectively.…”

“…[130][131][132][133] Lu 2 CaMg 2 Si 3 O 12 is another (Ln,Me) 3 (M,M 0 ) 5 O 12 -based solid solution phosphors with a garnet structure. [37][38][39] Lu 3+ /Ca 2+ ions are randomly located in eightfold dodecahedral sites with occupancies of 2/3 and 1/3, respectively. The Mg 2+ ion is in the octahedral sites while Si 4+ exclusively occupies the tetrahedral site.…”

Photoluminescence of cerium-doped (Ca1−xSrx)3RE2Ge3O12 garnet phosphors for solid state lighting: Relating structure to emission

“…The effect of changing the shape of the dodecahedral doping site (A) on the emission has been briefly discussed for Lu 2 CaMg 2 Si 3-O 12 :Ce versus aluminate garnets [10]. The solid solution between this phosphor and Ca 3 Sc 2 Si 3 O 12 :Ce was also investigated [13]. Wu et al [14] carried out the first comprehensive study which attempts to relate structural changes to emission wavelength.…”

Crystal structure and luminescence properties of (Ca2.94−xLuxCe0.06)(Sc2−yMgy)Si3O12 phosphors for white LEDs with excellent colour rendering and high luminous efficiency

“…The position of the Ce 3+ 5d levels is strongly influenced by the host lattice selection [17][18][19], and hence, the Ce 3+ emission can be controlled through careful substitutions in the dodecahedral, octahedral and tetrahedral sites. For the silicate garnets CSS and Lu 2 CaMg 2 Si 3 O 12 , in 2010, Setlur and co-workers [20,21] described the solid solution formation and demonstrated that Sc 3+ has a strong preference towards the A (octahedral) site, and the emission maximum for Ce 3+ 5d → 4f emission can be shifted continuously from 505 to 605 nm, corresponding to shifts in the lowest energy Ce 3+ 4f → 5d excitation band for a large crystal splitting. However, the luminescence intensities and temperature characteristics decrease following the Ce 3+ emission red shift in the solid solution.…”