Crystal-Site Engineering Control for the Reduction of Eu3+ to Eu2+ in CaYAlO4: Structure Refinement and Tunable Emission Properties
Citations Over TimeTop 10% of 2015 papers
Abstract
In this article, Eu-activated CaYAlO4 aluminate phosphors were synthesized by a solid-state reaction. Under UV light excitation, characteristic red line emission of Eu(3+) was detected in the range of 570-650 nm. In addition, we introduced crystal-site engineering approach into the CaYAlO4 host through incorporation of Si(4+)-Ca(2+) to replace Al(3+)-Y(3+), which would shrink the AlO6 octahedrons, accompanied by the expansion of CaO9 polyhedron, and then enable the partial reduction of Eu(3+) to Eu(2+). The crystal structure and underlying mechanism have been clarified on the basis of the Rietveld refinement analysis. The PL spectra of Ca0.99+xY1-xAl1-xSixO4:Eu0.01 (x = 0-0.30) exhibit both green emission of Eu(2+) (4f(6)5d(1)-4f(7), broadband around 503 nm) and red-orange emission of Eu(3+) ((5)D0-(7)F1,2, 593 and 624 nm) under UV light excitation with a quantum yield of 38.5%. The CIE coordinates of Ca0.99+xY1-xAl1-xSixO4:Eu0.01 (x = 0-0.30) phosphors are regularly shifted from (0.482, 0.341) to (0.223, 0.457) with increasing x, which would expand the application of Eu. Furthermore, this investigation reveals the correlations of structure and property of luminescent materials, which would shed light on the development of novel phosphors suitable for lighting and display applications.
Related Papers
- → Application of photoluminescence phosphors to a phosphor-liquid crystal display(2000)27 cited
- → Effect of phosphor composition and packaging structure of flexible phosphor films on performance of white LEDs(2018)14 cited
- → Mössbauer Spectroscopy of Europium-Containing Compounds(1989)34 cited
- → Luminescent Properties of BaMgAl10O17: Eu2+ Phosphors Coated with Y2SiO5(2006)13 cited
- → An Approach to Tune the Color of Sr2MgSi2O7: Eu2+, Dy3+Long Persistent Phosphor Using Y3Al5O12: Ce3+Remote Phosphor(2017)4 cited