A novel single-phase color tunable LiYGeO4:Dy3+, Eu3+ phosphor exhibiting warm white light and excellent thermal stability

Chunyu Zuo; Rujia Chen; Xiliang Jiang; Zhuang Leng; Yimin Yang; Zhipeng Zhang; Lingbo Zhou; Chun Li; Weiling Yang; Hai Lin; Lina Liu; Shasha Li; Fanming Zeng; Zhongmin Su

doi:10.1039/d3cp04754g

A novel single-phase color tunable LiYGeO₄:Dy³⁺, Eu³⁺ phosphor exhibiting warm white light and excellent thermal stability

Phys Chem Chem Phys. 2024 Jan 24;26(4):3375-3388. doi: 10.1039/d3cp04754g.

Authors

Chunyu Zuo^{1

2}, Rujia Chen^{1

2}, Xiliang Jiang^{1

2}, Zhuang Leng^{1

2}, Yimin Yang^{1

2}, Zhipeng Zhang^{1

2}, Lingbo Zhou^{1

2}, Chun Li^{1

2}, Weiling Yang^{1

2}, Hai Lin^{1

2}, Lina Liu^{1

2}, Shasha Li^{1

2}, Fanming Zeng^{1

2}, Zhongmin Su³

Affiliations

¹ School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China. lichun1210@163.com.
² Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China.
³ Jilin University, Changchun 130012, P. R. China.

PMID: 38204322
DOI: 10.1039/d3cp04754g

Abstract

LiYGeO₄ phosphors doped with Dy³⁺ and Eu³⁺ ions were synthesized using the solid phase method, and their color characteristics were adjustable. The bandgap value of LiYGeO₄ calculated by diffuse reflection data is very close to the theoretical value of 3.669 eV, indicating that LiYGeO₄ is an ideal candidate for doped rare earth activated ions. The analysis of the emission spectra and fluorescence attenuation curves of Dy³⁺ and Eu³⁺ co-doped LiYGeO₄ phosphors revealed a clear energy transfer process: energy transfer from Dy³⁺ to Eu³⁺. Analysis of emission spectra and fluorescence attenuation curves revealed a transfer of energy from Dy³⁺ to Eu³⁺. This transfer mechanism is attributed to the dipole-dipole interactions. In addition, by constantly adjusting the doping levels of Dy³⁺ and Eu³⁺, a warm white phosphor with a color temperature of 3881 K was obtained. Finally, the emission intensity of the LiYGeO₄:0.015Dy³⁺,0.02Eu³⁺ phosphor at 423 K was 86%, indicating that the phosphor has excellent thermal stability and 40% internal quantum efficiency, which proves the potential application of the LiYGeO₄ phosphor in white light-emitting diodes (w-LEDs).