Synthesis and competitive luminescence quenching mechanism of Ca3Al2O6:Ln3+ (Ln: Dy and Sm) phosphors. (December 2020)

• Record Type: Journal Article
• Authors: Bakr, M.; Kaynar, Ümit H.; Ayvacikli, M.; Benourdja, S.; Karabulut, Y.; Hammoudeh, A.; Can, N.
• Is Part Of: Materials research bulletin. Volume 132(2020)
• Publication Date: 2020-12
• Subjects: Ca3Al2O6XRD -- Gel combustion -- Photoluminescence -- Concentration quenching; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2020.111010
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Sm 3+ and Dy 3+ activated Ca3 Al2 O6 phosphors are synthesized by gel combustion method using different fuels. The size of synthesized phosphors is dependent on the utilized fuel composition. Concentration quenching mechanism is discussed according to the Dexter's theory. Photoluminescence properties of Sm 3+ and Dy 3+ activated Ca3 Al2 O4 phosphors are discussed. Abstract: Sm 3+ and Dy 3+ activated Ca3 Al2 O6 phosphors were produced through a gel combustion method using Urea + β-Alanine, Urea, and Urea + Glycine as fuels. The crystal structure and the phase purity of the obtained materials were characterized by X-ray powder diffraction (XRD). Ca3 Al2 O6 :Sm 3+ phosphor shows characteristic emission lines (565 nm, 602 nm, 649 nm, and 714 nm) in the orange red region assigned to 4 G5/2 → 6 HJ (J = 5/2, 7/2, 9/2, 11/2) transitions of Sm 3+ . The strongest peak is located at 602 nm. Emission spectra of Ca3 Al2 O6 :Dy 3+ show that there are two dominant peaks centered at 480 nm and 573 nm emitting blue and yellow light. Optimum doping concentrations of Sm(NO3 )3 and Dy(NO3 )3 are 0.01 % and 0.03 %, respectively. The concentration quenching mechanism is verified to be a dipole-dipole interaction as the type of energy transfer among Sm 3+ -Sm 3+ and Dy 3+ -Dy 3+ ions. The critical distance is also calculated to be 24.19 Å and 16.77 Å, respectively.