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Luminescence and energy transfer behavior in Gd0.985Er0.01Sm0.005Al0.995Cr0.005O3 for plant growth LED lighting
Authors: Mselmi, F.; Kammoun, S.; Bessaoud, M.; Dhahri, E.; Pina, J.; Costa, BFO
Ref.: Mater. Sci. Eng. B 327, 119217 (2026)
Abstract: The Gd 0.985 Er 0.01 Sm 0.005 Al 0.995 Cr 0.005 O 3 sample is synthesized using the solid-state reaction method. The Gd 0.985 Er 0.01 Sm 0.005 Al 0.995 Cr 0.005 O 3 samples crystallize in a Pbnm space group with orthorhombic structure phase. Under lambda ex = 377 nm, the PL spectrum of the Gd 0.985 Er 0.01 Sm 0.005 Al 0.995 Cr 0.005 O 3 sample exhibit two intense red peaks at 693 nm and 726 nm assigned to 2 T 1 ( 2 G)-> 4 A 2 ( 4 F) and 2 E( 2 G) -> 4 A 2 ( 4 F) transitions of Cr 3+ . It also exhibits lines at 562 nm, (602 nm, 609 nm) and 647 nm are due to the transitions 4 G 5/2 -> 6 H 5/2 , 4 G 5/2 -> 6 H 7/2 and 4 G 5/2 -> 6 H 9/2 of Sm 3+ [8]. A green emission band centered at 522 nm, 542 nm and 549 nm appear in the PL spectrum of the Gd 0.985 Er 0.01 Sm 0.005 Al 0.995 Cr 0.005 O 3 under lambda ex = 377 nm ascribed to the transitions 2 H 11/2 -> 4 I 15/2 , and 4 S 3/2 -> 4 I 15/2 of Er 3+ ions. The optical analysis indicates the presence of the energy transfer from Sm 3+ , Er 3+ , and intrinsic defects to Cr 3+ . This energy transfer enhances the far-red emission at 693 nm and 726 nm. The chromaticity (x, y) of the prepared phosphor Gd 0.985 Er 0.01 Sm 0.005 Al 0.995 Cr 0.005 O 3 indicate that it suitable for use as luminescent material for plant growth LED application.
