Inhomogeneous broadening of the luminescence in

Abstract

Five absorption bands with peaks at 210 nm, 246 nm, 284 nm, 296 nm, and 368 nm were observed at room temperature for Ce-doped CaYAlO 4 (CYA) crystals grown in a reducing atmosphere. Excitation at wavelengths below ∼400 nm of Ce:CYA crystals produces a broad luminescence band with a peak at ∼485 nm. The excitation spectrum of the luminescence detected at a fixed wavelength of 485 nm is very similar to the absorption spectrum. The ultraviolet absorption and visible luminescence are due to the 4f 1 ↔ 5d 1 transitions of Ce 3+ ions in CYA. The linear dependence of the luminescence peak energy on the excitation energy shows that the luminescence is inhomogeneously broadened by a random distribution of Ca 2+ and Y 3+ ions in the disordered CYA lattice.

Luminescence in LaCaAl3O7 prepared by combustion synthesis

“…The luminescence of Ce 3+ is inhomogeneously broadened by a random distribution of Ca 2+ and La 3+ . With increasing excitation wavelength, the peaks of the luminescence bands were found to shift to longer wavelength [19]. Similar results may be expected for YCaAl 3 O 7 :Ce.…”

Chromaticity of inhomogeneous broadening effect on CaxSr1−xAl2O4:Eu2+ phosphors

“…Another case was the random distribution of La 3+ /Sr 2+ in SLA (SrLaAlO 4 ) leading to a compositional disorder that causes significant inhomogeneous broadening of the spectral lines of rare-earth ion dopants. [13] In this paper, the excitation energy dependence of Eu 2+ luminescence is similar to that reported for the Ce 3+ and V 4+ luminescence in CaYAlO 4 [12,14], Cr 3+ luminescence in glasses and in gallgermanate crystals [15,16]. The spectra shifts were associated with inhomogeneous broadening of the band due to the inherent disorder in glasses.…”

“…In the earlier papers [9][10][11][12], the authors discussed the luminescent properties of Ti 3+ , V 4+ , Cr 3+ and Ce 3+ in CaYAlO 4 (CYA). Such crystals have a distribution of the crystal field caused by a substitutional disorder of Ca 2+ /Y 3+ sites in the CYA lattice.…”

“…Such crystals have a distribution of the crystal field caused by a substitutional disorder of Ca 2+ /Y 3+ sites in the CYA lattice. At the Ce 3+ -doped CYA [12], the disorder introduced a distribution of crystal-field interactions, giving rise to the variation in 5d energy levels. Such an energy situation was illustrated as a diagram of Ce 3+ in C 4v symmetry including spin-orbit interaction and disorder as perturbations.…”

Crystal growth and spectroscopic properties of Yb:CaYAlO4 single crystal

“…Yb:CaYAlO 4 has the same structure as Yb: CaGdAlO 4 [13]. In earlier papers [14][15][16][17][18][19][20][21], the properties of Nd, Er, Ti, Ce, V and Tm-doped CaYAlO 4 and Er, Yb co-doped CaYAlO 4 were discussed. CaYAlO 4 crystallizes with the tetragonal K 2 NiF 4 structure.…”