Preparation and luminescence properties of color-tunable single-phased LaPO₄:Eu³⁺/Tb³⁺ phosphors

Abstract

A novel series of color-tunable single-phased phosphors La_1–x–yPO₄:xEu³⁺/yTb³⁺(x=0, 0.01, 0.02, 0.03, 0.04, 0.05; y=0, 0.05, 0.10, 0.15, 0.20) was synthesized via co-precipitation method with diammonium hydrogen phosphate as precipitant. The morphology, crystal structure and photoluminescence properties of the as-prepared samples were characterized by means of X-ray diffraction(XRD), scanning electron microscopy(SEM) and fluorescence spectrophotometer. The results reveal that the as-synthesized samples calcined at 1100 °C display spherical morphology with uniform distribution. Upon excitation with 350 nm ultraviolet radiation, the LaPO₄:Eu³⁺/Tb³⁺ phosphors showed a green light peaking at 543 nm assigned to the characteristic ⁵ D ₄-⁷ F ₅ emission of Tb³⁺ and a red light peaking at 591 nm corresponding to the characteristic ⁵D₀-⁷ F ₁ emission of Eu³⁺ simultaneously. For the Eu³⁺/Tb³⁺ co-activated phosphors, Tb³⁺ acts as an efficient sensitizer to enhance the emission intensity of Eu³⁺ ions. The energy transfer mechanism and the emission color tunability of LaPO₄:Eu³⁺/Tb³⁺ have been studied. The results indicate that a color-tunable luminescence(from green to white to red) can be achieved by adjusting the Eu³⁺/Tb³⁺ doping ratio in the LaPO₄ host matrix.

Keywords

Lanthanum phosphate phosphor / Photoluminescence property / Color-tunable

References

[1] Liao Y. C., Lin C. H., Wang S. L. J. Am. Chem. Soc., 2005, 127: 9986.

[2] Wang T., Liu Y. H., Lee Y. B., Ao J. P., Bai J., Sakai S. Appl. Phys. Lett., 2002, 81: 2508.

[3] Jeong J., Jayasimhadri M., Lee H. S., Jang K., Yi S. S., Jeong J. H., Kim C. Physica B, 2009, 404: 2016.

[4] Ma W. B., Shi Z. P., Wang R. J. Alloy. Compd., 2010, 503: 118.

[5] Shi H., Zhang X. Y., Wang N. L., Dong W. L., Mi X. Y. Funct. Mater. Lett., 2014, 8: 1550006.

[6] Shang M. M., Li G. G., Kang X. J., Yang D. M., Geng D. L., Lin J. ACS Appl. Mater. Inerfaces, 2011, 3: 2738.

[7] Luo Q. L., Shen S. D., Lu G. Z., Xiao X. Z., Mao D. S., Wang Y. Q. J. Mater. Chem., 2009, 19: 8079.

[8] Wang N. L., Zhang S. Z., Zhang X. Y., Wei Y. Ceram. Int., 2014, 40: 16253.

[9] Grzyb T., Gruszeczka A., Wiglusz R. J., Lis S. J. Mater. Chem. C, 2013, 1: 5410.

[10] Zhao Z., Zuo J., Ding Z. J. J. Rare Earth., 2010, 28: 254.

[11] Pankratov V., Popov A.I., Kotlov A., Feldmann C. Opt. Mater., 2011, 33: 1102.

[12] Lokeswara R. G. V., Rama M. L., Chengaiah T., Jamalaiah B. C. Ceram. Int., 2014, 40: 3399.

[13] Li Y., Xia Y., Liao S., Long Q. W., Zhao X. Y., Dai S. S., Lu K. Mater. Lett., 2014, 123: 112.

[14] Phaomei G., Rameshwor S. W., Shanta S. N., Ningthoujam R. S. J. Lumin., 2013, 134: 649.

[15] Yang M., You H. P., Liang Y. L., Xu J. Z., Lu F., Dai L. M., Liu Y. J. Alloys Compd., 2014, 582: 603.

[16] García-Sevillano J., Cantelar E., Justo A., Ocaña M., Cussó F. Mater. Chem. Phys., 2013, 138: 666.