Luminescence properties of novel red phosphor NaSrPO4:Eu3+

A novel red-emitting NaSrPO4:Eu3+ phosphor was prepared by a conventional solid-state reaction. The luminescence properties and temperature dependence of NaSrPO4:Eu3+ were investigated. The phosphor exhibited red luminescence under the near-UV excitation of 395 nm, corresponding to the F-5(0)-> L-7(6) transition of Eu3+ ions, which matched well with the excitation wavelength of near-UV LED chips. The electronic transition due to D-5(0)-> F-7(2) transition of Eu3+ ions is stronger than the magnetic dipole transition due to D-5(0)-> F-7(1) of Eu3+ ions. Furthermore, Eu3+-doped NaSrPO4 phosphor shows higher thermally stable luminescence comparable to commercially available Y3Al5O12:Ce3+ phosphor. All the investigated suggested that this newly developed phosphor could find applications in white light devise utilizing InGaN-based excitation in the near-UV chips.