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Colour tuning via energy transfer of K2Ba(MoO4)2: Dy3+/Eu3+ phosphors with thermal-stable property

Ru Jingjing,Zhao Bing,Zeng Fan,Guo Feiyun

A set of colour tuning K 2 Ba(MoO 4 ) 2 : Dy 3+ /Eu 3+ (KBM: Dy 3+ /Eu 3+ ) phosphors were fabricated by solid-state method. The phase purity of as-prepared materials was validated by XRD and DRS analyses. The KBM: 0.03Dy 3+ sample exhibits two major luminescence lines at 481 and 572 nm when excited by 351 nm light, corresponding to Dy 3+ ions’ typical transitions of 4 F 9/2 → 6 H J (J = 15/2, 13/2). By introducing Eu 3+ ions into KBM: 0.03Dy 3+ phosphor, the ET from Dy 3+ to Eu 3+ ions arises, leading to colour tuning from green via yellowish green to pink with changing Eu 3+ ions’ concentration, along with the lowest CCT of KBM: 0.03Dy 3+ /0.03Eu 3+ sample. It can be verified by PLE and PL spectra analysis combined with the decay times of KBM: 0.03Dy 3+ /yEu 3+ samples. The energy transfer mechanism is also expounded. Meanwhile, the emission intensities at 423 K still maintain 72.8% for Dy 3+ ions and 91.2% for Eu 3+ ions relative to 303 K of the KBM: 0.03Dy 3+ /0.03Eu 3+ sample, displaying its brilliant thermal stability. All these results connote that KBM: Dy 3+ /Eu 3+ phosphors are prospected to be used for the near-UV excited white light-emitting diodes.