掺Tm3+和Tb3+的LiMgPO4磷光体的发光光谱与能量转移

续卓; 郭竞渊; 熊正烨; 唐强; 高沐

doi:10.7498/aps.70.20210357

摘要

稀土掺杂的LiMgPO₄(LMP)磷光体是一种很有前景的辐射剂量计材料, 热释光谱技术是研究材料中载流子陷阱和发光中心的有效手段. 为研究稀土掺杂LMP的发光机制, 用高温固相法研制了LMP:Tm, LMP:Tb和LMP:Tm, Tb磷光体, 用线性升温法测量了磷光体的热释光发光曲线和热释光谱, 并将之与荧光谱进行了对比分析. 实验结果表明: 在LiMgPO₄磷光体中, Tm³⁺, Tb³⁺共掺可使磷光体在300 ℃左右的热释光显著增强; LMP磷光体的热释光谱中可观测到比一般荧光谱更丰富的Tm³⁺离子和Tb³⁺离子的跃迁; Tm³⁺和Tb³⁺虽然都可成为发光中心, 但Tm³⁺起主要作用; 结合对热释光谱和荧光谱的深入分析, 可知磷光体中存在Tb³⁺→Tm³⁺的能量转移.

关键词:

LiMgPO₄ /
热释光 /
荧光 /
能量转移

Abstract

LiMgPO₄ (LMP) phosphor doped with rare earth is a promising radiation dosimeter material. Thermoluminescence (TL) spectroscopy is an effective method to study the carrier traps and luminescence centers in materials. To study the luminescent mechanism of rare-earth-doped LMP phosphors, LMP phosphors doped with Tm and Tb (LMP:Tm, LMP:Tb and LMP:Tm, Tb) are prepared by high temperature solid state reaction. The TL glow curve and TL spectrum of the phosphors are measured by the linear heating method, and compared with the photoluminescence (PL) spectrum. The shape of the TL glow curve of LMP phosphor varies with the doping active impurities, but the TL glow curves can be fitted by seven TL peaks. Double-doping Tm³⁺ and Tb³⁺ in LMP phosphor can enhance the TL intensity of the fifth peak (E ~ 1.39 eV) and weaken the seventh TL peak (E ~ 1.70 eV). By comparing the PL spectra with TL spectra of the phosphors, it can be seen that the TL spectra are more complex than the PL spectra excited by ultraviolet light (λ = 352 nm). In the TL process, the electrons which are excited to the conduction band release the energy to recombination centers, and the released energy can more effectively excite the rare earth ions from the ground state to excited states, resulting in the more TL emitting peaks than in the the PL process. Although Tm³⁺ and Tb³⁺ can be the luminescent centers in LMP phosphors when Tm³⁺ and Tb³⁺ are doped in LMP simultaneously, Tb³⁺ ions are likely to act as sensitizers in LMP:Tm and LMP:Tb phosphor, and Tb³⁺ ions transfer energy to the low-energy Tm³⁺ ions, which makes the luminescent centers, Tm³⁺ ions, excited to the high-energy state and then de-excited with emitting light. This result is also proved by the fact that the luminescence decay of Tb³⁺ in phosphors increases with Tm³⁺ concentration increasing. The energy transfer through non-radiative transition is more significant at higher temperature.

Keywords:

作者及机构信息

1.
广东海洋大学电子与信息工程学院, 湛江　524088

2.
中山大学物理学院, 广州　510275

3.
湛江科技学院智能制造学院, 湛江　524094

通信作者: 熊正烨, xiongzhengye@139.com

基金项目: 广东省科技计划(批准号: 2015A020216020)、国家自然科学基金(批准号: 11375278)和广东海洋大学(批准号: CXXL2019260)资助的课题

Authors and contacts

1.
School of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China

2.
School of Physics, Sun Yat-Sen University, Guangzhou 510275, China

3.
Institute of intelligent manufacturing, Zhanjiang University of Science and Technology, Zhanjiang 524094, China

Corresponding author: Xiong Zheng-Ye, xiongzhengye@139.com

Funds: Project supported by Science and Technology Planning Project of Guangdong Province, China (Grant No. 2015A020216020), the National Natural Science Foundation of China (Grant No. 11375278) and Guangdong Ocean University, China(Grant No. CXXL2019260)

文章全文 : translate this paragraph

参考文献

[1]	Daniels F, Boyd C A, Saunders D F 1953 Science 117 343 Google Scholar
[2]	Xiong Z Y, Xu J Y, Zhao F L, Zhang Y, Liu J, Tang Q 2017 J. Lumin. 192 85 Google Scholar
[3]	ZhangS, HuangY, Shi L, Seo H J 2010 J. Phys. Condens. Matter 22 235402 Google Scholar
[4]	Gai M Q, Chen C Y, Fan Y W, Wang J H 2013 J. Rare Earths 31 551 Google Scholar
[5]	Dhabekar B, Menon S N, Raja E A, Bakshi A K, Singh A K, Chougaonkar M P, Mayya Y S 2011 Nucl. Instrum. Meth. Phys. A 269 1844 Google Scholar
[6]	Singh A K, Menon S N, Dhabekar B, Kadam S, Chougaonkar M P, Mayya Y S 2012 Nucl. Instrum. Meth. Phys. A 274 177 Google Scholar
[7]	Bajaj N S, Palan C B, Koparkar K A, Kulkarni M S, Omanwar S K 2016 J. Lumin. 175 915
[8]	郭竞渊, 唐强, 唐桦明, 张纯祥, 罗达铃, 刘小伟 2017 物理学报 66 107802 Google Scholar GuoJ Y, Tang Q, Tang H M, Zhang C X, Luo D L, Liu X W 2017 Acta Phys. Sin. 66 107802 Google Scholar
[9]	Baran A, Mahlik S, Grinberg M, Cai P, Kim S I, Seo H J 2014 J. Phys. Condens. Matter 26 85401 Google Scholar
[10]	Kumar M, Dhabekar B, Menon S N, Bakshi A K 2013 Radiat. Prot. Dosim. 155 410 Google Scholar
[11]	Kumar M, Dhabekar B, Menon S N, Chougaonkar M P, Mayya Y S 2011 Nucl. Instrum. Methods Phys. Res. B 269 1849 Google Scholar
[12]	Gieszczyk W, Bilski P, Osowski M K, Nowak T, Malinowski L 2018 Radiat. Meas. 113 1419
[13]	Keskin I C, Türemis M, Kat M I, Gültekin S, Arslanlar Y T, Cetin A, Kibar R 2020 J. Lumin. 225 117276 Google Scholar
[14]	Tang H M, Lin L T, Zhang C X, Tang Q 2019 Inorg. Chem. 58 9698 Google Scholar
[15]	郭竞渊, 唐强, 兰婷婷, 张纯祥, 罗达玲 2015 中国稀土学报 33 404 Guo J Y, Tang Q, Lan T T, Zhang C X, Luo D L 2015 J. Chin. Rare Earths Soc. 33 404
[16]	Gieszczyk W, Marczewska B, Kosowski M, Mrozik A, Stoch P 2019 Materials 12 2861 Google Scholar
[17]	Hanic F, Handlovic M, Burdova K, Majling J 1982 J. Cryst. Spectrosc. 12 99 Google Scholar
[18]	詹明亮, 陈瑶窈, 续卓, 熊正烨 2020 核技术 43 050501 Google Scholar Zhan M L, Chen Y Y, Xu Z, Xiong Z Y 2020 Nucl. Tech. 43 050501 Google Scholar
[19]	McKeever S W S 1988 Thermoluminescence of Solids (London: Cambridge University Press) p75
[20]	Liu X, Teng Y, Zhuang Y, Xie J, Qiao Y, Dong G, Chen D, Qiu J 2009 Opt. Lett. 22 3565

施引文献

图 1 LMP磷光体的XRD与标准卡片对比图

Fig. 1. XRD of LMP phosphors doped with rare earth.

下载: 全尺寸图片幻灯片

图 2 LMP:Tb0.5at%磷光体的热释光发光曲线及其拟合

Fig. 2. TL glow curve and the fitting of LMP:Tb0.5at% phosphor.

下载: 全尺寸图片幻灯片

图 3 LMP:Tm0.5at%磷光体的热释光发光曲线及其拟合

Fig. 3. TL glow curve and the fitting of LMP:Tm0.5at% phosphor.

下载: 全尺寸图片幻灯片

图 4 LMP:Tb0.5at%, Tm0.5at%磷光体的热释光发光曲线及其拟合　(a) 线性纵坐标; (b)对数纵坐标

Fig. 4. TL glow curve and the fitting of LMP:Tb0.5at%, Tm0.5at% phosphor: (a) The ordinate is in linear scale; (b) the ordinate is in logarithmic scale.

下载: 全尺寸图片幻灯片

图 5 LMP:Tb0.5at%, Tmxat%磷光体在352 nm的近紫外光激发时的发光谱

Fig. 5. Luminescence spectra of phosphors LMP:Tb0.5at%, Tm x at% excited by ultraviolet light (λ = 352 nm).

下载: 全尺寸图片幻灯片

图 6 LMP:Tb0.5at%, Tm x at%磷光体荧光(λ_Em = 450 nm)衰减曲线

Fig. 6. Luminescence Decay Curves (λ_Em = 450 nm) of phosphors LMP:Tb0.5at%, Tm x at%.

下载: 全尺寸图片幻灯片

图 7 (a) LMP:Tb0.5at%磷光体的热释光谱 (b) LMP:Tm0.5at%磷光体的热释光谱 (c) LMP:Tb0.5at%, Tm0.5at%磷光体的热释光谱

Fig. 7. (a). TL contour spectra of phosphors LMP:Tb0.5at%. (b). TL contour spectra of phosphors LMP:Tm0.5at%. (c). TL contour spectra of phosphors LMP:Tb0.5at%, Tm0.5at%.

下载: 全尺寸图片幻灯片

图 8 (a) LMP:Tb0.5at%磷光体不同温区的热释光谱 (b) LMP:Tm0.5at%磷光体不同温区的热释光谱 (c) LMP:Tm0.5at%, Tb0.5at%磷光体不同温区的热释光谱

Fig. 8. (a). TL spectra of phosphors LMP:Tb0.5at% in different temperature ranges. (b). TL spectra of phosphors LMP:Tm0.5at% in different temperature ranges. (c). TL spectra of phosphors LMP:Tm0.5at%, Tb0.5at% in different temperature ranges.

下载: 全尺寸图片幻灯片

图 9 Tm离子和Tb离子的能级跃迁示意图

Fig. 9. Diagrammatic sketch of energy transition of Tm and Tb ions.

下载: 全尺寸图片幻灯片

表 1 LMP:Tb0.5at%磷光体的热释光陷阱参数

Table 1. TL trap’s parameters of LMP:Tb0.5at% phosphor.

峰序号	E/eV	s/Hz	n₀	b
峰1	0.87	4.18 × 10¹¹	1.68 × 10⁵	1.5
峰2	0.99	2.28 × 10¹²	1.11 × 10⁵	1.3
峰3	1.02	4.39 × 10¹¹	2.76 × 10⁵	2.0
峰4	1.17	4.88 × 10¹⁰	2.84 × 10⁵	2.0
峰5	1.39	1.23 × 10¹¹	1.64 × 10⁵	2.0
峰6	1.64	1.32 × 10¹²	1.32 × 10⁵	2.0
峰7	1.70	3.67 × 10¹¹	4.84 × 10⁵	1.6

下载: 导出CSV

表 2 LMP:Tm0.5at%磷光体的热释光陷阱参数

Table 2. TL trap’s parameters of LMP:Tm0.5at% phosphor.

峰序号	E/eV	s/Hz	n₀	b
峰1	0.89	7.92 × 10¹¹	8.83 × 10⁴	1.2
峰2	1.01	3.31 × 10¹²	2.34 × 10⁵	2.0
峰3	1.08	8.00 × 10¹⁰	1.04 × 10⁵	1.5
峰4	1.20	4.27 × 10¹⁰	1.85 × 10⁵	1.2
峰5	1.38	8.32 × 10¹⁰	2.83 × 10⁵	1.3
峰6	1.63	1.17 × 10¹²	4.50 × 10⁴	1.3
峰7	1.69	4.26 × 10¹¹	3.67 × 10⁴	1.0

下载: 导出CSV

表 3 LMP:Tb0.5at, Tm0.5at%磷光体的热释光陷阱参数

Table 3. TL trap’s parameters of LMP:Tb0.5at%, Tm0.5at% phosphor.

峰序号	E/eV	s/Hz	n₀	b
峰1	0.85	9.30 × 10¹¹	1.48 × 10⁵	1.9
峰2	0.95	1.89 × 10¹²	9.83 × 10⁴	2.0
峰3	1.09	2.74 × 10¹²	4.02 × 10⁴	2.0
峰4	1.16	4.99 × 10¹¹	2.48 × 10⁵	1.4
峰5	1.40	6.26 × 10¹¹	3.80 × 10⁶	1.2
峰6	1.58	8.31 × 10¹²	2.13 × 10⁵	1.5
峰7	1.70	2.18 × 10¹²	3.09 × 10³	1.1

下载: 导出CSV

表 4 LMP:Tb0.5at%, Tm0.5at%磷光体中Tb³⁺向Tm³⁺的能量转移效率

Table 4. The efficiency of energy transfer from Tb³⁺ to Tm³⁺ in LMP:Tb0.5at%, Tm0.5at% phosphor.

x	τ/μs	σ_τ/μs	η_ET	σ_η_ET
0	66.5	1.1	—	—
0.05	33.3	0.3	49.9%	1.0%
0.10	26.6	0.2	60.0%	1.1%
0.20	20.3	0.2	69.5%	1.4%
1.00	13.4	0.3	79.8%	2.3%

下载: 导出CSV

[1]	Daniels F, Boyd C A, Saunders D F 1953 Science 117 343 Google Scholar
[2]	Xiong Z Y, Xu J Y, Zhao F L, Zhang Y, Liu J, Tang Q 2017 J. Lumin. 192 85 Google Scholar
[3]	ZhangS, HuangY, Shi L, Seo H J 2010 J. Phys. Condens. Matter 22 235402 Google Scholar
[4]	Gai M Q, Chen C Y, Fan Y W, Wang J H 2013 J. Rare Earths 31 551 Google Scholar
[5]	Dhabekar B, Menon S N, Raja E A, Bakshi A K, Singh A K, Chougaonkar M P, Mayya Y S 2011 Nucl. Instrum. Meth. Phys. A 269 1844 Google Scholar
[6]	Singh A K, Menon S N, Dhabekar B, Kadam S, Chougaonkar M P, Mayya Y S 2012 Nucl. Instrum. Meth. Phys. A 274 177 Google Scholar
[7]	Bajaj N S, Palan C B, Koparkar K A, Kulkarni M S, Omanwar S K 2016 J. Lumin. 175 915
[8]	郭竞渊, 唐强, 唐桦明, 张纯祥, 罗达铃, 刘小伟 2017 物理学报 66 107802 Google Scholar GuoJ Y, Tang Q, Tang H M, Zhang C X, Luo D L, Liu X W 2017 Acta Phys. Sin. 66 107802 Google Scholar
[9]	Baran A, Mahlik S, Grinberg M, Cai P, Kim S I, Seo H J 2014 J. Phys. Condens. Matter 26 85401 Google Scholar
[10]	Kumar M, Dhabekar B, Menon S N, Bakshi A K 2013 Radiat. Prot. Dosim. 155 410 Google Scholar
[11]	Kumar M, Dhabekar B, Menon S N, Chougaonkar M P, Mayya Y S 2011 Nucl. Instrum. Methods Phys. Res. B 269 1849 Google Scholar
[12]	Gieszczyk W, Bilski P, Osowski M K, Nowak T, Malinowski L 2018 Radiat. Meas. 113 1419
[13]	Keskin I C, Türemis M, Kat M I, Gültekin S, Arslanlar Y T, Cetin A, Kibar R 2020 J. Lumin. 225 117276 Google Scholar
[14]	Tang H M, Lin L T, Zhang C X, Tang Q 2019 Inorg. Chem. 58 9698 Google Scholar
[15]	郭竞渊, 唐强, 兰婷婷, 张纯祥, 罗达玲 2015 中国稀土学报 33 404 Guo J Y, Tang Q, Lan T T, Zhang C X, Luo D L 2015 J. Chin. Rare Earths Soc. 33 404
[16]	Gieszczyk W, Marczewska B, Kosowski M, Mrozik A, Stoch P 2019 Materials 12 2861 Google Scholar
[17]	Hanic F, Handlovic M, Burdova K, Majling J 1982 J. Cryst. Spectrosc. 12 99 Google Scholar
[18]	詹明亮, 陈瑶窈, 续卓, 熊正烨 2020 核技术 43 050501 Google Scholar Zhan M L, Chen Y Y, Xu Z, Xiong Z Y 2020 Nucl. Tech. 43 050501 Google Scholar
[19]	McKeever S W S 1988 Thermoluminescence of Solids (London: Cambridge University Press) p75
[20]	Liu X, Teng Y, Zhuang Y, Xie J, Qiao Y, Dong G, Chen D, Qiu J 2009 Opt. Lett. 22 3565

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掺Tm³⁺和Tb³⁺的LiMgPO₄磷光体的发光光谱与能量转移