Abstract
A set of colour tuning K2Ba(MoO4)2: Dy3+/Eu3+ (KBM: Dy3+/Eu3+) phosphors were fabricated by solid-state method. The phase purity of as-prepared materials was validated by XRD and DRS analyses. The KBM: 0.03Dy3+ sample exhibits two major luminescence lines at 481 and 572 nm when excited by 351 nm light, corresponding to Dy3+ ions’ typical transitions of 4F9/2 → 6HJ (J = 15/2, 13/2). By introducing Eu3+ ions into KBM: 0.03Dy3+ phosphor, the ET from Dy3+ to Eu3+ ions arises, leading to colour tuning from green via yellowish green to pink with changing Eu3+ ions’ concentration, along with the lowest CCT of KBM: 0.03Dy3+/0.03Eu3+ sample. It can be verified by PLE and PL spectra analysis combined with the decay times of KBM: 0.03Dy3+/yEu3+ samples. The energy transfer mechanism is also expounded. Meanwhile, the emission intensities at 423 K still maintain 72.8% for Dy3+ ions and 91.2% for Eu3+ ions relative to 303 K of the KBM: 0.03Dy3+/0.03Eu3+ sample, displaying its brilliant thermal stability. All these results connote that KBM: Dy3+/Eu3+ phosphors are prospected to be used for the near-UV excited white light-emitting diodes.
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Acknowledgments
This work was supported by the Foundation of Fujian Province (No. 2021J011149), Program for Innovative Research Team of Ningde Normal University (No. 2023T03), Project from Fujian Provincial Department of Education (No. JAT210469), the Youth Special Project of Ningde Normal University (No. 2021Q106), and Project from Fujian Province University Key Laboratory of Green Energy and Environment Catalysis (No. FJ-GEEC202006).
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Ru, J., Zhao, B., Zeng, F. et al. Colour tuning via energy transfer of K2Ba(MoO4)2: Dy3+/Eu3+ phosphors with thermal-stable property. Bull Mater Sci 47, 74 (2024). https://doi.org/10.1007/s12034-023-03130-y
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DOI: https://doi.org/10.1007/s12034-023-03130-y