CaAl2Si2O8:Dy3+, Eu3+: synthesis, luminescence properties, energy transfer, and tunable emission

Renping Cao; Zibin Lai; Yewen Cao; Fangrui Cheng; Chenxing Liao; Shuijing Nie; Xuehua Yi; Jing Wang

doi:10.1039/D3NJ00917C

CaAl₂Si₂O₈:Dy³⁺, Eu³⁺: synthesis, luminescence properties, energy transfer, and tunable emission

Renping Cao,

*^abc Zibin Lai,^a Yewen Cao,^b Fangrui Cheng,

^a Chenxing Liao,*^b Shuijing Nie,^c Xuehua Yi^a and Jing Wang

*^ad

Author affiliations

* Corresponding authors

^a Guangdong Rare Earth Photofunctional Materials Engineering Technology Research Center, Meizhou Rare Earth Photofunctional Materials Engineering Technology Research Center, School of Chemistry and Environment, Jiaying University, Meizhou, China
E-mail: jxcrp@163.com

^b College of Rare Earth, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, China
E-mail: 155307815@qq.com

^c College of Science, Jiangxi University of Engineering, Xinyu 338000, China

^d Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, P. R. China
E-mail: ceswj@mail.sysu.edu.cn

Abstract

Luminescent materials used in solid-state lighting usually face the challenge of the adjustment of luminescence properties. The coordinated luminescence of two activators in luminescent materials is a good method. Herein, CaAl₂Si₂O₈:Dy³⁺, CaAl₂Si₂O₈:Eu³⁺, and CaAl₂Si₂O₈:Dy³⁺, Eu³⁺ with a pure phase (CaAl₂Si₂O₈) were synthesized in air. The X-ray diffraction patterns of the samples were measured and their crystal structures were elucidated. Under excitation at 350 nm, the yellow emission of CaAl₂Si₂O₈:Dy³⁺ in the spectral range of 525–800 nm was observed due to the ⁴F_9/2 → ⁶H_15/2, ⁶H_13/2, ⁶H_11/2, and ⁶H_9/2 transitions of Dy³⁺ ions. CaAl₂Si₂O₈:Eu³⁺ showed red emission in the range of 550–720 nm because of the transitions ⁵D₀ → ⁷F₁, ⁷F₂, ⁷F₃, and ⁷F₄ of Eu³⁺ ions when it was excited by 394 nm light. A tunable color emission of CaAl₂Si₂O₈:Dy³⁺, Eu³⁺ from yellow to red was found when the ratio between Dy³⁺ and Eu³⁺ ions was changed. We investigated the concentration-dependent spectra and ensured the optimal Dy³⁺ and Eu³⁺ concentrations in host CaAl₂Si₂O₈. The spectra of the samples manifested the energy transfer from Dy³⁺ to Eu³⁺ ions. The energy-level diagrams of Dy³⁺ and Eu³⁺ ions were used to analyze the luminous mechanism of the samples. The research results are beneficial to the development of other Dy³⁺ and Eu³⁺ co-doped luminescence materials.

New Journal of Chemistry

CaAl₂Si₂O₈:Dy³⁺, Eu³⁺: synthesis, luminescence properties, energy transfer, and tunable emission

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CaAl₂Si₂O₈:Dy³⁺, Eu³⁺: synthesis, luminescence properties, energy transfer, and tunable emission

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