A single-phased warm white-light-emitting phosphor BaMg2(PO4)2:Eu2+, Mn2+, Tb3+ for white light emitting diodes

Abstract A single-phase white-emitting phosphor BaMg 2 (PO 4 ) 2 :Eu 2+ , Mn 2+ , Tb 3+ is synthesized by a high temperature solid-state reaction. The luminescent properties and the efficient energy transfer from Eu 2+ to Mn 2+ and Tb 3+ in BaMg 2 (PO 4 ) 2 are investigated. The chromaticity coordinates of BaMg 2 (PO 4 ) 2 :Eu 2+ , Mn 2+ , Tb 3+ can be tuned from (0.153, 0.056) (for BaMg 2 (PO 4 ) 2 :Eu 2+ ) to (0.666, 0.261) (for BaMg 2 (PO 4 ) 2 :Mn 2+ ), and eventually to (0.313, 0.562) (for BaMg 2 (PO 4 ) 2 :Tb 3+ ) by the effective resonance type energy transfer. The warm white light can be realized with the superior chromaticity coordinates of (0.346, 0.299) and low correlated color temperature (CCT = 4464 K) by coupling the emission bands peaking at 447, 544 and 663 nm attributed to the contribution from Eu 2+ , Tb 3+ and Mn 2+ , respectively.