Fluorescence and crystal structure of SrLa_1−xAlO₄:xEu³⁺ phosphor synthesized using a sol–gel method

Abstract

The SrLa 1Àx AlO 4 :xEu 3+ phosphors were obtained using one calcination of a precursor synthesized using a sol-gel method. When excited at 396 nm, this phosphor emits a red light mixed with several strong peaks centred at 596 nm, 616 nm and 625 nm, attributed to 5 D 0 ! 7 F 1, 2 transitions of Eu 3+ ions, respectively. The concentration quenching occurs at x = 1.5 mol% mol of SrLa 1Àx Eu x AlO 4 and the critical energy transfer distance is calculated to be 13.13 Å, the dipole-dipole interaction was found to play a role. In addition, the colour purity could be up to 97.5%. Simultaneously, the thermal stability of SrLaAlO 4 :Eu 3+ was measured and the thermal quenching was found at c. 275 C (T 0.5 ), the excitation energy was 0.19 eV. Current results demonstrate that SrLaAlO 4 :Eu 3+ could be a red component candidate for white light LEDs pumped by near-UV chips.

A Novel Warm Red-Emission of SrLa0.9Eu0.1AlO4 Phosphor obtained by Combustion Method.

“…The color purity showed that an intense red color was emitted for Eu-doped SrLaAlO 4 phosphors with 53.1 % for 0.10 mol.% concentrations of Eu 3+ . In comparing with the investigation by Yan et al [14], we observed increasing the Eu 3+ dopant concentration to 0.10 mol.% reduces the chromaticity coordinates, color purity and CCT as observed in Table 2. The proposed energy diagram of SLA Eu in Fig.…”

“…SrLaAlO 4 belong to the ABCO 4 -kind layered perovskite compound as a host lattice where A represents the alkaline earth divalent metallic ion, B represents the trivalent lanthanide ion while C represents any trivalent transition metal ion [13]. This research is novel and has not been investigated in contrast to the reports by Yan et al on Eu doped SrLaAlO 4 who used sol-gel as their synthesis method and lower Eu-dopant concentration (0.0 -0.025 mol.%) [14]. The aim of this research is to investigate the structural, morphological, optical and photoluminescence properties of 0.10 mol.% Eu doped SrLaAlO 4 phosphors by combustion synthesis method.…”