Luminescence properties of BiPO4:Ln (Ln = Dy3+, Tb3+ and Sm3+) orthophosphate phosphors for near-UV-based solid-state lighting

The BiPO4:Ln (Ln = Dy3+, Tb3+ and Sm3+) phosphor were prepared using wet chemical synthesis and studied its photoluminescence properties. Under 352 nm excitation, the BiPO4:Dy3+ phosphor shows the blue (481 nm) and yellow (575 nm) emissions due to the F-4(9/2) -> H-6(15/2) and F-4(9/2) -> H-6(13/2) transitions of the Dy3+ ion, respectively. When BiPO4:Tb3+ phosphor was excited at 378 nm, it emits efficient narrow green emission at 545 nm due to D-5(4) -> F-7(5) transition. The BiPO4:Sm3+ phosphor shows yellow, orange and red emissions centred at 598 nm, which is attributed to the (4)G(5/2) -> H-6(7/2) transition of the Sm3+ ion. The CIE coordinates indicate that the prepared phosphors have high colour purity. The photoluminescence results suggests that BiPO4:Ln (Ln = Dy3+, Tb3+ and Sm3+) phosphor may be used as a possible material for near-UV-based solid-state lighting.

Automated summary

The BiPO4:Ln (Ln = Dy3+, Tb3+ and Sm3+) phosphors with different lanthanide ions were synthesized and their photoluminescence properties were studied. The BiPO4:Dy3+ phosphor emitted blue (481 nm) and yellow (575 nm) light under 352 nm excitation, attributed to the transitions of the Dy3+ ion. The BiPO4:Tb3+ phosphor showed efficient narrow green emission (545 nm) under 378 nm excitation due to a specific transition. The BiPO4:Sm3+ phosphor exhibited yellow, orange, and red emissions centered at 598 nm, attributed to the transition of the Sm3+ ion. The prepared phosphors exhibited high color purity based on the CIE coordinates. These findings suggest that BiPO4:Ln (Ln = Dy3+, Tb3+ and Sm3+) phosphors may have potential applications in near-UV-based solid-state lighting.