Influence of Al³⁺Doping into the Zr⁴⁺Site on the Photoluminescence Properties of Ca_3-xEu_xZrSi₂O_9+x/2Phosphors

Abstract

Red-emitting Ca3−xEuxZr1−yAlySi2O9+(x−y)/2 (0.05 ≤ x ≤ 0.25, 0 ≤ y ≤ 0.07) phosphors were synthesized in a single phase form by the conventional solid-state reaction method and their photoluminescence properties were characterized. The charge-transfer efficiency from O2− to Eu3+ was controlled by the Al3+ doping into the Zr4+ site in the host Ca3ZrSi2O9 lattice, which resulted in the successful enhancement of the luminescent emission intensity of these phosphors. The highest emission intensity was obtained for Ca2.88Eu0.12Zr0.95Al0.05Si2O9.035, where the relative emission intensity of this phosphor was 94% compared with that of a commercial Y1.94Eu0.06O3 phosphor.

HRTEM investigation of phase stability in alumina–zirconia multilayer thin films

“…Hence, only tetragonal phase can be stabilized at room temperature by doping undersized Al 3+ ions in the zirconia nanocrystals. 10,11,56 One of the objectives of this paper is also to study the ZrO 2 layer thickness on the stabilization of the high temperature tetragonal phase. For that particular purpose multilayers consisted of alternate layers of ZrO 2 and Al 2 O 3 at different zirconia layer thicknesses (15 and 7 nm) has been synthesized keeping the thickness of the alumina layers same.…”

Synthesis, electronic structures, and photoluminescence properties of an efficient and thermally stable red-emitting phosphor Ca3ZrSi2O9:Eu3+,Bi3+ for deep UV-LEDs

“… 12 In order to further enhance the emission efficiency, Zuo et al tried to partially substitute Zr 4+ ions with Al 3+ ions in the host Ca 3 ZrSi 2 O 9 , and finally the inner quantum yield was increased to 46%. 13 This enhancement was mainly ascribed to the charge compensation effect, which is helpful for improving the crystallinity of the phosphors. However, the relatively low quantum yield still limits its practical use.…”

Red emitting phosphors based on titanite with high thermal stability

“…Therefore, such phosphors with the layered structure would be resistant to the concentration quenching, even if a large amount of activator was introduced into the host lattice. Considering this, our research group has successfully synthesized several novel phosphors with layered structure, and has revealed that these layered compounds are suitable for host materials of phosphors with high luminescent property [2][3][4][5].…”