The synthesis and photoluminescence characteristics Bi3+/Dy3+ doped Ca2LaTaO6 phosphors upon the NUV light excitation

The researches on cyan phosphors those can be effectively excited by near-ultraviolet (NUV) light are being hot topics lately because that they have potential applications in phosphor converted white light emitting diodes (pc-WLEDs) based on the NUV chips. In this work, Bi 3+ /Dy 3+ doped Ca 2 LaTaO 6 phosphors were prepared through a solid state reaction procedure, and their luminescence characteristics were investigated through the measurements of the luminescence spectra and the decay curves. The excitation spectra indicate that the Bi 3+ or Dy 3+ single doped and Bi 3+ /Dy 3+ codoped Ca 2 LaTaO 6 phosphors are suitable for NUV excitation due to the excitation spectra within 250–500 nm. The emission spectra show that the lights of Bi 3+ /Dy 3+ codoped Ca 2 LaTaO 6 phosphors locate in cyan region. The ptotoluminescence characteristics indicate that they have possible uses in pc-WLEDs based on NUV chips. • The broad blue emission of Ca 2 LaTaO 6 :Bi 3+ phosphors. • The cyan emission of Ca 2 LaTaO 6 :Bi 3+ /Dy 3+ phosphors due to Bi 3+ .→ Dy 3+ energy transfer • The potential applications of Bi 3+ /Dy 3+ doped Ca 2 LaTaO 6 in NUV based pc-WLEDS.