Optimal Doping of Ho3+ in CaTiO3 Perovskite for Enhanced Photoluminescence and Sustainable Green Emission

IF 2.2 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Journal of Electronic Materials Pub Date : 2024-08-17 DOI:10.1007/s11664-024-11345-w

Vijay Singh, Aadil Ahmad Bhat, Abhijeet R. Kadam, S. Saravanakumar, Pankaj Kumar Tripathi, S. J. Dhoble, Ji Bong Joo

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Abstract

In this work, the synthesis of Ho³⁺-doped calcium titanate perovskite (CaTiO₃) revealed significant photoluminescence (PL) properties, predominantly displaying a distinct green emission. The investigation explored Ho³⁺-doped CaTiO₃ perovskite synthesized via the sol–gel method. Structural analysis confirmed an orthorhombic crystal structure through powder x-ray diffraction (XRD) and Rietveld refinement, while Fourier transform infrared (FT-IR) spectroscopy confirmed the presence of functional groups in Ho³⁺-doped CaTiO₃. Diffuse reflectance spectroscopy (DRS) revealed a charge transfer band between O²⁻ and Ho³⁺ ions in the range of 250–350 nm, supported by photoluminescence excitation (PLE) spectra. A bandgap of 3.39 eV was found for Ho³⁺-doped CaTiO₃. At 0.03 mol Ho³⁺, the PLE band intensity was saturated, indicating optimal excitation efficiency. Emission spectra revealed distinct intra 4f–4f transitions, particularly a green emission at 545 nm under 454 nm excitation corresponding to ⁵F₄ + ⁵S₂ → ⁵I₈ transition. The PL intensity reached its peak at 0.03 mol Ho³⁺ and then decreased due to concentration quenching. Color purity reached ~90%, highlighting its potential in applications requiring precise green emission. The results of the study suggest that this perovskite is well suited for optoelectronics, lighting, displays, or industries that require specific green light emission properties.

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在 CaTiO3 包晶石中优化掺杂 Ho3+，实现增强型光致发光和可持续绿色发射

在这项研究中，掺杂了 Ho3+ 的钙钛矿包晶（CaTiO3）的合成显示出显著的光致发光（PL）特性，主要表现为明显的绿色发射。该研究探讨了通过溶胶-凝胶法合成的掺杂 Ho3+ 的 CaTiO3 包晶石。结构分析通过粉末 X 射线衍射（XRD）和里特维尔德精炼证实了正交晶系结构，而傅立叶变换红外光谱（FT-IR）则证实了掺杂 Ho3+ 的 CaTiO3 中存在官能团。漫反射光谱（DRS）显示，在 250-350 纳米范围内，O2- 离子和 Ho3+ 离子之间存在电荷转移带，光致发光激发（PLE）光谱也证实了这一点。掺杂了 Ho3+ 的 CaTiO3 的带隙为 3.39 eV。0.03 mol Ho3+时，PLE带强度达到饱和，表明激发效率达到最佳。发射光谱显示了明显的 4f-4f 内转变，特别是在 454 nm 激发下 545 nm 处的绿色发射，对应于 5F4 + 5S2 → 5I8 转变。PL 强度在 0.03 mol Ho3+ 时达到峰值，然后由于浓度淬灭而下降。颜色纯度达到约 90%，突出了其在需要精确绿色发射的应用中的潜力。研究结果表明，这种包晶非常适合光电、照明、显示或需要特定绿光发射特性的行业。

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来源期刊

Journal of Electronic Materials 工程技术-材料科学：综合

CiteScore

4.10

自引率

4.80%

发文量

693

审稿时长

3.8 months

期刊介绍： The Journal of Electronic Materials (JEM) reports monthly on the science and technology of electronic materials, while examining new applications for semiconductors, magnetic alloys, dielectrics, nanoscale materials, and photonic materials. The journal welcomes articles on methods for preparing and evaluating the chemical, physical, electronic, and optical properties of these materials. Specific areas of interest are materials for state-of-the-art transistors, nanotechnology, electronic packaging, detectors, emitters, metallization, superconductivity, and energy applications. Review papers on current topics enable individuals in the field of electronics to keep abreast of activities in areas peripheral to their own. JEM also selects papers from conferences such as the Electronic Materials Conference, the U.S. Workshop on the Physics and Chemistry of II-VI Materials, and the International Conference on Thermoelectrics. It benefits both specialists and non-specialists in the electronic materials field. A journal of The Minerals, Metals & Materials Society.