Citation: Yi ZHANG, Cui-Ping ZHOU, Qi-Feng ZHANG, Xin-Dan FENG. Combustion Synthesis and Performances of Amorphous La₂Ti₂O₇∶Eu³⁺ Phosphor for Plant Growth Lighting[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(6): 1073-1080. doi: 10.11862/CJIC.2022.114 shu

Combustion Synthesis and Performances of Amorphous La₂Ti₂O₇∶Eu³⁺ Phosphor for Plant Growth Lighting

College of Science, Sichuan Agricultural University, Ya′an, Sichuan 625014, China

Corresponding author: Yi ZHANG, yizhang@sicau.edu.cn
Received Date: 10 February 2022
Revised Date: 7 April 2022

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Amorphous La₂Ti₂O₇∶Eu³⁺ phosphors were synthesized by the combustion method and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence spectra to study the structure, morphology, and luminescent properties. Then it was further applied in wheat growth lighting LEDs (lightemitting diodes) to investigate the illumination effect on growth rate and photosynthesis pigments of wheat. Compared with the crystalline sample synthesized by the solid-state method, the amorphous La₂Ti₂O₇∶Eu³⁺ phosphor can increase the emission intensity of ⁷F₂ energy-level transition relative to ⁷F₁ energy-level from 2.8 to 5.3 by reducing the coordination environment symmetry around Eu³⁺ ions, and the emission peak showed a redshift from 611 to 613 nm. The amorphous La₂Ti₂O₇∶Eu³⁺ phosphor exhibited a color coordinate of (0.661, 0.339) and a color purity of 95.9% as compared with 90.9% of the crystalline sample, which is more suitable for applications in plant growth lighting LEDs. The amorphous La₂Ti₂O₇∶Eu³⁺ phosphor overcomes the problem of low luminous efficiency of Eu³⁺ ions in the amorphous host, which achieved a high internal quantum efficiency of 79.8% and an external quantum efficiency of 43.0%. Besides, the emission intensity of the amorphous La₂Ti₂O₇∶Eu³⁺ phosphor at 150 ℃ can maintain 46.3% of that at room temperature. Finally, the as-fabricated LED lamp can accelerate the growth rate of wheat, resulting in an improvement of 28% of the content of chlorophyll and carotene, which shows a potential to be applied in agricultural lighting LEDs.
- phosphor,
- combustion method,
- amorphous,
- plant growth lighting
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Combustion Synthesis and Performances of Amorphous La₂Ti₂O₇∶Eu³⁺ Phosphor for Plant Growth Lighting