Concentration quenching of Eu2+ doped Ca2BO3Cl. (March 2016)

• Record Type: Journal Article
• Authors: Seed Ahmed, H.A.A.; Swart, H.C.; Bergman, Peber; Kroon, R.E.
• Is Part Of: Materials research bulletin. Volume 75(2016)
• Page Start: 47
• Page End: 50
• Publication Date: 2016-03
• Subjects: A. Optical materials -- C. X-ray diffraction -- D. Luminescence -- D. Optical properties -- D. Phosphors; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2015.11.024
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Ca2 BO3 Cl doped with Eu 2+ prepared by solid state reaction. Concentration quenching studied by intensity and lifetime measurements. Accurate determination of the critical transfer distance. Interaction mechanism verified to be dipole–dipole interactions. Abstract: With the aim of determining the concentration quenching mechanism of Eu 2+ doped Ca2 BO3 Cl, a series of phosphors with a varied Eu 2+ concentration (Ca2− x BO3 Cl: x Eu 2+ ) was synthesized by the solid state reaction method. The phase structure was determined by X-ray diffraction. Photoluminescence (PL) measurements showed broad excitation and emission signatures of the allowed f–d transition of Eu 2+ ions. The PL emission intensity was found to be increased by increasing the concentration of Eu 2+ ions up to x = 0.03 and then decreased as a result of the concentration quenching effect. The lifetime of the emission from the Eu 2+ ions was measured and the decrease in the lifetime with increasing Eu 2+ concentration confirmed that non-radiative energy transfer occurred between Eu 2+ ions. From the luminescence data, the value of the critical transfer distance was calculated as 1.5 nm and the corresponding concentration quenching mechanism was verified to be a dipole–dipole interaction.