Structural, thermal, and optical spectroscopic studies of Sm3+-doped Ba2ZnSi2O7 phosphors for optical thermometry applications

IF 5.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Tejas, A. Princy, S. Masilla Moses Kennedy, Vikash Mishra, M. I. Sayyed, Taha A. Hanafy and Sudha D. Kamath
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Abstract

Samarium-doped Ba2ZnSi2O7 orange red-emitting phosphors for novel applications in temperature measurement were prepared by a solid-state synthesis method. A Ba2ZnSi2O7 akermanite-structured Sm3+ phosphor was allocated to the C2/c space group and monoclinic system. Using FTIR, identification of different bonds with their vibrational modes has been done. Stimulated at 403 nm, the as-prepared phosphors show yellow (560 nm), orange (600 and 645 nm), and red (705 nm) emissions, which were also used to maximize the dopant concentration. Sm3+ ions may be uniformly dispersed throughout the Ba2ZnSi2O7 matrix, and Sm3+ consists of irregular microparticles. Optical energy bandgap values for Ba2ZnSi2O7 and 0.4 mol%Sm3+ (∼3.33 eV and ∼3.40 eV) reveal the formation of faulty energy levels in the band gap. Sm3+ quenching at an appropriate concentration of 0.4 mol%, with a critical distance of approximately 44.33 Å, and a θ value of 3.93, almost equal to 4, was found to be indicative of the dipole–dipole type of electric multipolar interaction. Excellent thermal stability of the PL peaks was observed in Ba2ZnSi2O7:0.4%Sm3+. A novel dual-model thermometry approach based on an adjusted Boltzmann population distribution and an exponential function would be put forward. The Ba2ZnSi2O7:Sm3+ phosphor exhibited relative sensitivities of 2.02% K−1 based on modified Boltzmann population distribution through the FIR strategy and temperature-dependent lifetime was also employed to calculate relative sensitivities of 3.25% K−1 based on exponential function. In light of these experimental results, the produced Sm3+ doped Ba2ZnSi2O7 phosphors can thus be a promising choice for UV-excitable warm lighting systems and non-contact optical thermometry measurements.

Abstract Image

用于光学测温应用的Sm3+掺杂Ba2ZnSi2O7荧光粉的结构、热学和光学光谱研究
采用固态合成方法制备了具有新型测温应用的掺钐Ba2ZnSi2O7橙色发红荧光粉。在C2/c空间群和单斜晶系中分配了一种Ba2ZnSi2O7铁长石结构的Sm3+荧光粉。利用红外光谱技术,对不同的键及其振动模式进行了识别。在403 nm的激发下,制备的荧光粉显示黄色(560 nm)、橙色(600和645 nm)和红色(705 nm)发射,这也被用来最大化掺杂浓度。Sm3+离子可以均匀地分散在Ba2ZnSi2O7基体中,Sm3+由不规则的微粒组成。Ba2ZnSi2O7和0.4 mol%Sm3+ (~ 3.33 eV和~ 3.40 eV)的光能带隙值揭示了带隙中错误能级的形成。Sm3+在0.4 mol%的适当浓度下猝灭,临界距离约为44.33 Å, θ值为3.93,几乎等于4,表明电多极相互作用为偶极-偶极型。在Ba2ZnSi2O7:0.4%Sm3+中,PL峰具有良好的热稳定性。提出了一种基于调整后玻尔兹曼总体分布和指数函数的双模型测温方法。基于修正玻尔兹曼种群分布的FIR策略,Ba2ZnSi2O7:Sm3+荧光粉的相对灵敏度为2.02% K−1,基于指数函数的温度依赖寿命计算的相对灵敏度为3.25% K−1。根据这些实验结果,所制备的掺杂Sm3+的Ba2ZnSi2O7荧光粉因此可以成为uv激发暖照明系统和非接触式光学测温测量的有希望的选择。
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来源期刊
Materials Advances
Materials Advances MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.60
自引率
2.00%
发文量
665
审稿时长
5 weeks
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