Point Defects and Photoluminescence of Green Phosphors Ca(1-1.5x)WO4: and Ca(1-2x)WO4:Tb x3+ Nax
+

Cho SW

Korean Journal of Materials Research, Vol.23, No.9, 537-542, September, 2013

DOI10.3740/MRSK.2013.23.9.537 Export Citation

Point Defects and Photoluminescence of Green Phosphors Ca(1-1.5x)WO4: and Ca(1-2x)WO4:Tb x3+ Nax +

Two types of Tb- and Na-substituted green phosphors Ca(1-1.5x)WO4: and Ca(1-2x)WO4: were synthesized with various x values, using a solid-state reaction. The former phosphors contained both substitutional and vacancy point defects, while the later had only substitutional defects. X-ray diffraction results showed that the main diffraction peak, (112), was centered at 2θ = 28.72o and indicated that there was no basic structural deformation caused by substitutions or vacancies. The photoluminescence emission and photoluminescence excitation spectra revealed the optical properties of trivalent terbium ions, Tb3+. Typical transitions, 5D3→7F6, 7F5, 7F4 and 5D4→7F6, 7F5, 7F4, 7F3, and cross relaxations were observed. Subtle differences in the photoluminescence of green phosphors were observed as a result of the point defects. The FT-IR spectra indicated that some of the ungerade vibrational modes had shifted positions and changed shapes, spreading out over a wide range of frequencies. This change can be attributed to the different masses of Tb3+ and Na+ ions and VCa" vacancies compared to Ca2+ ions. The gerade normal modes of the Raman spectra exhibited subtle differences resulting from point defects in Ca(1-1.5x)TbxWO4 and Ca(1-2x)TbxNaxWO4.

Keywords:scheelite CaWO4;Ca(1-1.5x) WO4;Ca(1-2x) WO4;green phosphor;point defect

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[2] Cho SW, Bull. Korean Chem. Soc., 34(9), 2769 (2013)

[3] Blasse G, Grabmaier BC, Luminescent Materials, Springer-Verlag, Berlin, Germany. (1994)

[4] Warner TE, Synthesis, Properties and Mineralogy of Important Inorganic Materials, p. 228-239, John Wiley and Sons, U. K. (2011)

[5] Connelly NG, Damhus T, Hartshorn RM, Hutton AT, Nomenclature of Inorganic Chemistry, IUPAC Recommendations 2005, p. 238-241, RSC Publishing, Cambridge, U. K. (2005)

[6] Shi S, Gao J, Zhou J, Optical Materials, 30, 1616 (2008)

[7] Atkins P, Overton T, Rourke J, Weller M, Armstrong F, Inorganic Chemistry, 4th ed., p.259, Oxford University Press, Oxford, U. K. (2006)

[8] Kang ZC, Eyring L, J. Alloy. Compd., 249, 206 (1997)

[9] Qiu GH, Wang DH, Jin XB, Chen GZ, Electrochim. Acta, 51(26), 5785 (2006)

[10] Nassau K, Loiacono GM, J. Phys. Chem. Solds, 24, 1503 (1963)

[11] Shannon RD, Acta Cryst., A32, 751 (1976)

[12] Cullity BD, Stock SR, Elements of X-Ray Diffraction, 3rd ed., p.339, Prentice Hall, U. S. A. (2001)

[13] Tilley RJD, Defects in Solids, p. 13-14, John Wiley & Sons, U. S. A. (2008)

[14] Chiang YM, Birnie D, III, Kingery WD, Physica Ceramics, John Wiley & Sons, 131 (1997)

[15] Kodaira CA, Brito HF, Felinto MCFC, Journal of Solid State Chemistry, 171, 401 (2003)

[16] Liao J, Qiu B, Wen H, You W, Optical Materials, 31, 1513 (2009)

[17] Wu H, Hu Y, Kang F, Chen L, Wang X, Ju G, Mu Z, Materials Research Bulletin, 46, 2489 (2011)

[18] Bartolo BD, Optical Interactions in Solids, 2nd ed.,p.188, World Scientific, Singapore. (2010)

[19] Cavalli E, Boutinaud P, Mahiou R, Bettinelli M, Dorenbos P, Inorg. Chem., 49(11), 4916 (2010)

[20] Tian Y, Chen BJ, Yu HQ, Hua RN, Li XP, Sun JS, Cheng LH, Zhong HY, Zhang JS, Zheng YF, Yu TT, Huang LB, J. Colloid Interface Sci., 360(2), 586 (2011)

[21] Rousseau DL, Bauman RP, Porto SPS, J. Raman Spectrosc., 10, 253 (1981)

[22] Gracia L, Longo VM, Cavalcante LS, Beltran A, Avansi W, Li MS, Mastelaro VR, Varela JA, Longo E, Andrs J, J. Appl. Phys., 110, 043501 (2011)

[23] Cavalcante LS, Longo VM, Sczancoski JC, Almeida MA, Batista JA, Varela JA, Orlandi MO, Longo E, Li MS, CrystEngComm, 14, 853 (2012)