Effect of Strontium on Luminescence Properties and Substitution Site of Eu Doped Sr-Ca-Hydroxyapatite

doi:10.15541/jim20160181

Abstract

Abstract:

A series of Europium (Eu) and Strontium (Sr) codoped hydroxyapatite samples (Ca_10-_x-Sr_x-HAp: Eu) were designed and prepared using the chemical co-precipitation method. The crystalline structure, chemical composition and luminescent property of samples were characterized by X-ray diffraction (XRD) and photoluminescent spectrum (PL). XRD patterns showed that Eu doping had little effect on the structure of the samples, while with the increase of Sr content, crystallinity and interplanar crystal spacing were increased. PL spectra indicate that the fluorescence intensity at 596 nm and 618 nm of Ca-Sr-HAp: Eu samples increased firstly and then decreased with increase of Sr content at 394 nm excitation, and the strongest peak appeared in the Ca₃-Sr₇-HAp: Eu samples. At the same time, the fluorescence lifetime of the samples showed the same tendency with the increase of Sr content. In addition, the ratio of magnitude between electric dipole and magnetic dipole transition (I_R/I_O) also increased firstly and decreased subsequently along with the increase of Sr content in the matrix. Furthermore, the energy transfer parameters (f) calculated from luminescent dynamic of Eu³⁺ correlating to different sites and transitions present the reverse change. It is concluded that the doped sites of Eu³⁺ ions in the host lattice are affected by the content and location of Sr²⁺ ions in the matrix. Thereby a tunable luminescent property of Ca_10-_x-Sr_x-HAp: Eu samples can be obtained by changing the site of Eu ions in the matrix through adjusting the value of Sr/Ca.

Key words: hydroxyapatite, Sr²⁺, Eu³⁺, luminescent property, substitution site

CLC Number:

TB321

YIN Hai-Rong, LIU Jing, QIAO Yin-Po, LI Yan-Xiao, ZHANG Pan, ZHOU Qin, YANG Chen. Effect of Strontium on Luminescence Properties and Substitution Site of Eu Doped Sr-Ca-Hydroxyapatite[J]. Journal of Inorganic Materials, 2016, 31(10): 1103-1109.

Figures/Tables 6

References 29

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x	A₁(f_trans)	B₁(1-f_trans )	C	t₁₂/μs	t₁/μs	γ₁/s^-1/2	t₂₁/μs	R²
0	—	10.982	—	—	3967	0.5262	—	0.9954
1	35.541(0.653)	13.573(0.248)	9.97	627	4235	0.5683	277.48	0.9964
3	117.578(0.882)	15.322(0.118)	2.55	1211	3889	3.99E-12	35.43	0.9992
5	42.416(0.759)	11.716(0.241)	5.56	917	1888	3.8901	143.59	0.9986
7	105.082(0.665)	50.826(0.335)	4.18	964	3013	0.1687	8.92	0.9993
8	248.368(0.650)	128.191(0.350)	9.96	1255	3696	1.37E-12	72.81	0.9980
9	34.414(0.449)	34.472(0.551)	6.28	11544	913	3.85E-13	61.66	0.9985
10	22.097(0.315)	37.959(0.685)	4.68	7318	833	1.18E-13	4.67	0.9987

x	A₁(f_trans)	B₁(1-f_trans )	C	t₁₂/μs	t₁/μs	γ₁/s^-1/2	t₂₁/μs	R²
0	—	10.982	—	—	3967	0.5262	—	0.9954
1	35.541(0.653)	13.573(0.248)	9.97	627	4235	0.5683	277.48	0.9964
3	117.578(0.882)	15.322(0.118)	2.55	1211	3889	3.99E-12	35.43	0.9992
5	42.416(0.759)	11.716(0.241)	5.56	917	1888	3.8901	143.59	0.9986
7	105.082(0.665)	50.826(0.335)	4.18	964	3013	0.1687	8.92	0.9993
8	248.368(0.650)	128.191(0.350)	9.96	1255	3696	1.37E-12	72.81	0.9980
9	34.414(0.449)	34.472(0.551)	6.28	11544	913	3.85E-13	61.66	0.9985
10	22.097(0.315)	37.959(0.685)	4.68	7318	833	1.18E-13	4.67	0.9987

x	A₂(1-f)	B₂(f)	t₁₂/μs	t₂/μs	γ₂/s^-1/2	R²
0	—	—	—	—
1	155.844(0.607)	53.804(0.393)	37.52	2477.45	1.0358	0.9978
3	466.144(0.750)	131.660(0.250)	78.85	2711.73	0.8919	0.9992
5	239.591(0.741)	58.741(0.259)	98.96	2143.47	0.7993	0.9991
7	509.235(0.715)	118.934(0.285)	101.12	2480.58	0.6962	0.9994
8	335.056(0.720)	74.884(0.280)	121.20	3846.19	0.6797	0.9994
9	259.136(0.485)	78.198(0.515)	89.03	2895.34	0.8650	0.9990
10	167.785(0.279)	49.342(0.721)	61.10	2240.63	0.9330	0.9990

x	A₂(1-f)	B₂(f)	t₁₂/μs	t₂/μs	γ₂/s^-1/2	R²
0	—	—	—	—
1	155.844(0.607)	53.804(0.393)	37.52	2477.45	1.0358	0.9978
3	466.144(0.750)	131.660(0.250)	78.85	2711.73	0.8919	0.9992
5	239.591(0.741)	58.741(0.259)	98.96	2143.47	0.7993	0.9991
7	509.235(0.715)	118.934(0.285)	101.12	2480.58	0.6962	0.9994
8	335.056(0.720)	74.884(0.280)	121.20	3846.19	0.6797	0.9994
9	259.136(0.485)	78.198(0.515)	89.03	2895.34	0.8650	0.9990
10	167.785(0.279)	49.342(0.721)	61.10	2240.63	0.9330	0.9990