Synthesis and luminescence properties of novel white emitting phosphor KMgLa(PO4)2:Dy3+

A series of white emitting phosphor of KMgLa (PO 4 ) 2 :Dy 3+ were synthesized via high temperature solid-state method, and the luminescence properties were systematically investigated. Under the 349 nm ultraviolet excitation, KMgLa(PO 4 ) 2 :Dy 3+ shows the 481 nm (blue) and 575 nm (yellow) emission peaks, which are assigned to the 4 F 9/2 – 6 H 15/2 and 4 F 9/2 – 6 H 13/2 transitions of Dy 3+ . The emission intensities of KMgLa(PO 4 ) 2 :Dy 3+ are influenced by the Dy 3+ concentration, and the concentration quenching effect is observed, and the corresponding mechanism is the dipole–dipole (d–d) interaction, and the critical distance is calculated to be 1.136 nm. The CIE chromaticity coordinates of KMgLa(PO 4 ) 2 :Dy 3+ are close to that of standard white light. According to the emission intensity with different temperatures, the sample should have the good thermal stability . The results indicate that KMgLa(PO 4 ) 2 :Dy 3+ may be a potential application to white LEDs .