Citric based sol–gel synthesis and luminescence characteristics of CaLa2ZnO5:Eu3+phosphors for blue LED excited white LEDs

Synthesis and luminescent properties of CaLa2ZnO5:Ln (Ln:Tm3+ or Er3+) phosphors

“…All the diffraction peaks for the prepared samples were exactly matched with the reported tetragonal phase in Ref. [23]. No impurity phase effected by the RE ions was observed at the current doping levels, indicating that Er 3 þ or Tm 3 þ ions were completely dissolved into La 3 þ sites of CLZO host lattice.…”

“…Accordingly, each individual ion had much higher excitation energy in CL compared with PL, which may result in the quenching of CL spectra at somewhat higher doping concentration of Tm 3 þ ions [27]. Therefore, it is interestingly noticeable that the Tm 3 þ ions activated phosphor shows relatively low activator concentration as compared with the Eu 3 þ ions activated phosphor in the same host lattice at about 10 mol% [23]. The concentration quenching is ascribed to the enhanced strength of dipolar interaction between the neighboring activator ions [28,29].…”

“…RE 3 þ ions doped BaLa 2 ZnO 5 (BLZO) had been proved as a good luminescent material [18]. Likewise, CLZO exhibited good luminescence properties when doped individually with Eu 3 þ ions because the CLZO phosphor is isostructural with BLZO [23]. To the best of our knowledge, until now upconversion properties of Yb 3 þ -Er 3 þ , Yb 3 þ -Ho 3 þ ions codoped CLZO have been reported [24,25].…”

“…The ternary oxides XY 2 ZO 5 (X=Ba, Y=RE, Z=Zn, Cu) host lattices have been receiving great attention due to their interesting structural, physical and chemical properties and also additionally exhibited special magnetic, optical and superconducting properties [23][24][25]. RE 3 þ ions doped BaLa 2 ZnO 5 (BLZO) had been proved as a good luminescent material [18].…”

Self-assembled three-dimensional NaY(WO4)2:Ln3+ architectures: Hydrothermal synthesis, growth mechanism and luminescence properties

“…The realization of strong white emission requires the generation and an adequate combination of the three fundamental red, green, and blue (RGB) light colors, which greatly challenge people's ability of material design including host composition and the suitable combination of sensitizers and activator ions. Therefore, white LEDs are expected to be new light sources in the illumination field and have attracted increasing attention in recent years [13][14][15][16][17][18]. Till now, a wide variety of inorganic materials, including hydrate, borate, molybdate and tungstate have been prepared with complex 3D hierarchical shapes [19][20][21][22].…”