化工新型材料

化工新型材料 ›› 2025, Vol. 53 ›› Issue (2) : 187-192. DOI: 10.19817/j.cnki.issn1006-3536.2025.02.016

科学研究

CaGdAlO₄∶Yb³⁺/Er³⁺/Mn⁴⁺荧光粉上转换发光及其双探针温度传感研究

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Upconversion luminescence and bi-probe temperature sensing characteristics of CaGdAlO₄∶Yb³⁺/Er³⁺/Mn⁴⁺ phosphors

Li Yuqiang¹, Yang Jian², Wang Shuai², Zhou Hengwei¹, Liu Yuxue²

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Received
2023-12-25
Issue Date	Revised Date
2025-02-20	2023-12-25

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摘要

过渡金属离子上转换发光是拓展稀土离子光谱范围的有效途径之一。使用高温固相法合成了Yb³⁺/Er³⁺/Mn⁴⁺掺杂的CaGdAlO₄纯相荧光粉,在980nm激光激发下,CaGdAlO₄∶Yb_0.1,Er_0.01,Mn_0.003荧光粉的上转换发光性能最优。室温发射谱图中,位于528、550、663和710nm处的发射峰分别归属于Er³⁺的 ²H_11/2→⁴I_15/2、⁴S_3/2→⁴I_15/2、⁴F_9/2→⁴I_15/2和Mn⁴⁺的 ²E→⁴A₂能级跃迁,均是双光子过程。300～573K变温实验表明,基于单一发光中心Er³⁺荧光强度比FIR_528/550参数,相对灵敏度S_R-528/550从0.95×10^-2K^-1(300K)单调减小到0.27×10^-2K^-1(573K);基于Mn⁴⁺-Er³⁺双发光中心荧光强度比FIR_710/663参数,相对灵敏度S_R-710/663从0.37×10^-2K^-1(300K)先增大到 2.08×10^-2K^-1(418K),随后减小为1.35×10^-2K^-1(573K)。当温度为420K时,S_R-710/663相比于S_R-528/550增大了近4倍。结果表明,CaGdAlO₄∶Yb_0.1,Er_0.01,Mn_0.003荧光粉在双探针光学温度传感领域具有潜在的应用价值。

Abstract

Upconversion luminescence of transition metal ions is an effective route to expand the spectral region of rare earth ions.In this work,Yb³⁺/Er³⁺/Mn⁴⁺-doped CaGdAlO₄ pure-phase phosphors were synthesized by a high-temperature solid-state method.Under 980nm laser excitation,the CaGdAlO₄∶Yb_0.1,Er_0.01,Mn_0.003 phosphor exhibited optimal upconversion luminescence performance.In the room-temperature emission spectra,the emission peaks at 528,550,663 and 710nm could be attributed to the ²H_11/2→⁴I_15/2(Er³⁺),⁴S_3/2→⁴I_15/2(Er³⁺),⁴F_9/2→⁴I_15/2(Er³⁺) and the ²E→⁴A₂(Mn⁴⁺) transitions,respectively,all of which were two-photon absorption process.For Er³⁺ ions single-emitting centers,based on fluorescence intensity ratio of the R_528/550 parameters,it was observed that the relative sensitivities S_R-528/550 monotonically decreased from 0.95×10^-2K^-1 (at 300K) to 0.27×10^-2K^-1 (at 573K) in the temperature range from 300 to 573K.For both Er³⁺ and Mn⁴⁺ ions dual-emitting centers,based on fluorescence intensity ratio of the FIR_710/663 parameters,it could be found that the relative sensitivities S_R-710/663 increased first from 0.37×10^-2K^-1(at 300K) to 2.08×10^-2K^-1 (at 418K) and then decreased to 1.35×10^-2K^-1 (at 573K).Furthermore,the S_R-710/663 increased nearly 4 times compared with S_R-528/550 when the temperature was about 420K.These results demonstrated that CaGdAlO₄∶Yb_0.1,Er_0.01,Mn_0.003 phosphors had potential applications in the field of bi-probe optical temperature sensing.

关键词

荧光粉 / 上转换 / Mn⁴⁺ / 荧光强度比 / 温度传感

Key words

phosphor / upconversion / Mn⁴⁺ ion / fluorescence intensity ratio / temperature sensing

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CaGdAlO₄∶Yb³⁺/Er³⁺/Mn⁴⁺荧光粉上转换发光及其双探针温度传感研究[J]. 化工新型材料, 2025, 53(2): 187-192 DOI:10.19817/j.cnki.issn1006-3536.2025.02.016

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