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

A series of white emitting phosphor of KMgLa (PO4)2:Dy3+ were synthesized via high temperature solid-state method, and the luminescence properties were systematically investigated. Under the 349 nm ultraviolet excitation, KMgLa(PO4)2:Dy3+ shows the 481 nm (blue) and 575 nm (yellow) emission peaks, which are assigned to the 4F9/2-6H15/2 and 4F9/2-6H13/2 transitions of Dy3+. The emission intensities of KMgLa(PO4)2:Dy3+ are influenced by the Dy3+ 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(PO4)2:Dy3+ 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(PO4)2:Dy3+ may be a potential application to white LEDs.