Facile shape control of GdPO\(_4\).H\(_2\)O:Tb\(^{3+}\) by solvothermal method using di/polyethylene glycol as soft template

Thanh Huong Nguyen; Pham Thi Lien; Hoang Thi Khuyen; Nguyen Thi Ngoc Anh; Do Khanh Tung; Nguyen Vu; Dinh Manh Tien; Nguyen Thanh Binh

doi:10.15625/0868-3166/23283

Author affiliations

Authors

Nguyen Thanh Huong Institute of Materials Sciences, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Hanoi 100000, Vietnam https://orcid.org/0000-0002-4468-8965
Pham Thi Lien Institute of Materials Sciences, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Hanoi 100000, Vietnam https://orcid.org/0000-0002-1473-3008
Hoang Thi Khuyen Institute of Materials Sciences, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Hanoi 100000, Vietnam https://orcid.org/0000-0001-7456-5766
Nguyen Thi Ngoc Anh Institute of Materials Sciences, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Hanoi 100000, Vietnam https://orcid.org/0000-0001-8567-7595
Do Khanh Tung Institute of Materials Sciences, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Hanoi 100000, Vietnam https://orcid.org/0000-0001-5132-4935
Nguyen Vu Institute of Materials Sciences, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Hanoi 100000, Vietnam
Dinh Manh Tien Institute of Materials Sciences, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Hanoi 100000, Vietnam
Nguyen Thanh Binh Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Giang Vo, Hanoi 11108, Vietnam

DOI:

https://doi.org/10.15625/0868-3166/23283

Keywords:

GdPO\(_4\)·H\(_{2}\)O:Tb\(^{3+}\), solvothermal method, PEG, DEG, morphology control, photoluminescence

Abstract

Tb³⁺-doped GdPO₄·H₂O phosphors were synthesized with wire-, rod-, and particle-like morphologies using a solvothermal method. This was achieved by varying the reaction solvent between diethylene glycol (DEG) and polyethylene glycol (PEG) of different molecular weights. The crystal structure, morphology, and photoluminescence (PL) properties were characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and PL spectroscopy. The emission spectra showed the characteristic green luminescence of Tb³⁺ ions, with transition from the ⁵D₄ → ⁷F_j (J = 6, 5, 4, 3) at 489, 543, 586, and 620 nm, respectively. Systematic analysis revealed a strong correlation between material morphology, crystal structure, and luminescence efficiency. The sample with a nanoparticle morphology, synthesized at 100 °C in a PEG 8000 medium, exhibited the highest PL intensity. It displayed a dominant green emission at 543 nm (⁵D₄ → ⁷F₅) and sharp, well-defined emission bands. These findings confirm that a solvent-mediated morphology control strategy is effective for optimizing the luminescence performance of GdPO₄-based phosphors.

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