Luminescence and energy transfer of Ce³⁺-Eu²⁺ in Ca₉Al(PO₄)₇

Abstract

A series of Ce³⁺, Eu²⁺ and Ce³⁺-Eu²⁺ doped Ca₉Al(PO₄)₇ phosphors are synthesized by a high temperature solid-state method. Under 291 nm excitation, Ca₉Al(PO₄)₇:Ce³⁺ has one emission band at 356 nm, which is attributed to 4f⁰5d¹→4f¹ transition of Ce³⁺. Under 305 nm excitation, Ca₉Al(PO₄)₇:Eu²⁺ presents one emission band at 445 nm, which is assigned to 4f⁶5d¹→4f⁷ transition of Eu²⁺. Energy transfer from Ce³⁺ to Eu²⁺ in Ca₉Al(PO₄)₇ is validated and proved to be a resonant type via a quadrupole-quadrupole interaction. Critical distance (R_c) of Ce³⁺ to Eu²⁺ in Ca₉Al(PO₄)₇ is calculated to be 1.264 nm. Moreover, the emission intensity of Ca₉Al(PO₄)₇:Ce³⁺, Eu²⁺ can be tuned by properly adjusting the relative doping composition of Ce³⁺/Eu²⁺.

Keywords

Energy Transfer / Emission Intensity / Critical Distance / Energy Transfer Efficiency / Optoelectronic Letter

References

[1] Li J, Deng J-c, Lu Q-f, Wang D-j. Optoelectronics Letters. 2013, 9: 293

[2] Wang Q, Ci Z, Zhu G, Que M, Xin S, Wen Y, Wang Y. ECS Journal of Solid State Science and Technology. 2012, 1: R92

[3] Dai X-h, Li H-l, Pang L-b, Gao S-j. Optoelectronics Letters. 2013, 9: 194

[4] Sun J, Sun Y, Zeng J, Du H. Optical Materials. 2013, 35: 1276

[5] Wang Z, Lou S, Li P. Journal of Alloys and Compounds. 2014, 586: 536

[6] Hou J, Jiang W, Fang Y, Wang Y, Yin X, Huang F. ECS Journal of Solid State Science and Technology. 2012, 1: R57

[7] Wang Q, Deng D, Hua Y, Huang L, Wang H, Zhao S, Jia G, Li C, Xu S. Journal of Luminescence. 2012, 132: 434

[8] Fang Y, Li L, Chen Y, Wang H, Zeng R. Journal of Luminescence. 2013, 144: 13

[9] Song X, Fu R, Agathopoulos S, He H, Zhao X, Li R. Journal of the Electrochemical Society. 2010, 157: J34

[10] Fu R, Agathopoulos S, Song X, Zhao X, He H, Yu X. Optical Materials. 2010, 33: 99

[11] Sun J, Zeng J, Sun Y, Du H. Journal of Alloys and Compounds. 2012, 540: 81

[12] Huang C-H, Luo L, Chen T-M. Journal of the Electrochemical Society. 2011, 158: J341

[13] Paulose P I, Jose G, Thomas V, Unnikrishnan N V, Warrier M K R. Journal of Physics and Chemistry of Solids. 2003, 64: 841

[14] Dexter D L, Schulman J H. The Journal of Chemical Physics. 1954, 22: 1063

[15] Blass G. Philips Res. Rep.. 1969, 24: 131