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A Simple Sol–Gel Route for the Synthesis and Characterization of Tm-Doped CaAl2O4 Nanophosphor

M. Freeda, G. Suresh


Calcium Aluminate nanophosphor doped with Thulium (CaAl2O4: Tm) was synthesized by simple sol–gel route.The obtained nanophosphor was characterized by X-ray diffraction technique (XRD). The surface morphology was determined by scanning electron microscopy (SEM). Alsophotoluminescence spectra (PL), and thermogravimetric analysis/differential scanning calorimetry (TGA/DSC) characterization were done. The  XRD revealed the formation of monoclinic structure and the particle size was determined by Scherrer formula. It showed that the particles were of somewhat round shape and interlinked with each other, leading to the formation of bigger particles. Also it was found that some irregular aggregations were formed in the image. It was found that PL emission was obtained at 390nm, 520 nm, 790 nm corresponding to blue, green and IR region of the spectrum, respectively for 360nm excitation. Also, PL emission was obtained at 395nm, 535 nm, 805 nm for 800nm excitation. When comparing up-conversion luminescence with down-conversion, the up-conversion luminescence spectra were red shifted.


XRD, SEM, PL, sol–gel method, calcium aluminate nanophosphor

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Wang R, Zhang J, Xianmei X, et al. White LED with high color rendering index based on Ca8Mg(SiO4)4Cl2: Eu2+ and ZnCdTe/CdSe quantum dot hybrid phosphor.Mater Lett.2012; 84: 24–6p.

Rambabu U, Sang-Do H. Enhanced luminescence intensity and color purity of the red emitting LnVO4:Eu3+@ SiO2 (Ln = Gd, Y and Gd/Y) powder phosphors.Mater Res Bull. 2013; 48: 512–20p.

Zhang ZW, Shen XH, Peng YS, et al. Preparation and investigation of Ca2.96(P0.99B0.01O4)2:0.04Dy3+ single-phase full-color phosphor.Mater Lett. 2014; 117: 14–16p.

Fan L, Zhao X, Zhang S, et al. Enhanced luminescence intensity of Sr3B2O6:Eu2+ phosphor prepared by sol–gel method. J Alloys Compd. 2013; 579: 432–7p.

Aitasalo T, Holsa J, Junger H, et al. Sol–gel processed Eu2+doped alkaline earth aluminates. J Alloys Compd. 2002; 341: 76–8p.

Singh V, Zhu J, Bhide M, et al. Synthesis, characterisation andluminescence investigations of Eu activated CaAl2O4 phosphor.Opt Mater. 2007; 30: 446–50p.

Xu X, Wang Y, Li Y, et al. Energy transfer between Eu2+ and Mn2+ in longafterglowphosphor CaAl2O4:Eu2+, Nd3+, and Mn2+.J Appl Phys. 2009; 105(083502):1–083502:4p.

Kurihara LK, Suib SL, Sol-gel synthesis of ternary metal oxides. 1. Synthesis and characterization of MAl2O4 (M = Mg, Ni, Co, Cu, Fe, Zn, Mn, Cd, Ca, Hg, Sr, and Ba) and lead aluminum oxide (Pb2Al2O5).Chem Mater. 1993; 5: 609p.

Tang Z, Zhang F, Zhang Z, et al.J Euro Ceram Soc. 2000; 20: 2129p.

Aitasalo T, Holsa J, Jungner H, et al. Sol-gel processed Eu2+-doped alkaline earth aluminates. J Alloy Compd. 2002; 341(1–2): 76–8p.

Cullity BD. Elements of X-ray diffraction, 2nd Edn. New York, USA: Addison Wesley; 1978.


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