Near ultraviolet excited down conversion Eu and Er co-doped CaAl2O4 color tunable nano-phosphors: Structural, morphological and photolumniscent characteristics. (2019)

• Record Type: Journal Article
• Authors: Kumar, Naveen; Marí, Bernabe; Jindal, Jitender; Mittal, Anuj; Kumari, Kavitha; Maken, Sanjeev
• Is Part Of: Materials today. Volume 19:Part 2(2019)
• Page Start: 646
• Page End: 649
• Publication Date: 2019
• Subjects: Phosphors -- Luminescence -- Combustion method -- Electric dipole -- Calcium aluminate; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2019.07.747
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: A series of CaAl2 O4 :Eu 3+ (1 mol%) co-doped with Er 3+ (0, 1, 2, and 5 mol%) was synthesized by urea assisted combustion method at 600 °C and further calcinations was done at 1000 °C to enhance the crystalline character and luminescence properties. Synthesized samples were characterized structurally and optically using the X-ray diffraction (XRD) and spectrofluorometer respectively. From XRD analysis, monoclinic phase of CaAl2 O4 is reported in all the samples indicating that doping of Eu 3+ and Er 3+ do not change the crystalline structure of calcium aluminate. Both Eu 3+ and Eu 2+ states were detected in the synthesized materials whose ratio changes with calcination as well as with co-doping of the Er 3+ ions. CaAl2 O4 :Eu 3+ (1 mol%) synthesized at 600 °C show high intense peak around 440 nm due to presence of Eu 2+ state, whose intensity decrease with co-doping and upon calcination where as at the same time intensity of peak in the red region due to the presence of Eu 3+ increases. In the compounds calcined at 1000 °C, electric dipole 5 D0 → 7 F3 transition of Eu 3+ at 657 nm appears as peak with highest intensity. The Er 3+ ion acts as sensitizer and enhances the luminescent properties of co-doped samples.