Energy transfer from VO43− group to Sm3+ ions in Ba3(VO4)2:3xSm3+ microparticles: A bifunctional platform for simultaneous optical thermometer and safety sign

Near‐ultraviolet light–induced dazzling red emission in CaGd2(MoO4)4:2xSm3+ compounds for phosphor‐converted WLEDs

“…As shown in Figure B, the measured emission spectrum contained four bands with the central wavelengths of approximately 563 nm ( 4 G 5/2 → 6 H 5/2 ), 600 nm ( 4 G 5/2 → 6 H 7/2 ), 645 nm ( 4 G 5/2 → 6 H 9/2 ), and 706 nm ( 4 G 5/2 → 6 H 11/2 ) originating from the 4f‐4f transitions of Sm 3+ ions . On the basis of previous literatures, ones knows that the 4 G 5/2 → 6 H 5/2 transition pertains to the magnetic dipole transition, while the 4 G 5/2 → 6 H 9/2 is related to the electric dipole transition . In general, the emission intensity ratio of electric dipole transition to magnetic dipole transition can be applied to identify the symmetry properties of the local environment surrounding the trivalent rare‐earth ions.…”

“…Under the irradiation of 405 nm light, the representative emission spectrum of the CaGd 2 (MoO 4 ) 4 :0.06Sm 3+ phosphor in the wavelength range of 500‐750 nm was recorded, as described in Figure B. As shown in Figure B, the measured emission spectrum contained four bands with the central wavelengths of approximately 563 nm ( 4 G 5/2 → 6 H 5/2 ), 600 nm ( 4 G 5/2 → 6 H 7/2 ), 645 nm ( 4 G 5/2 → 6 H 9/2 ), and 706 nm ( 4 G 5/2 → 6 H 11/2 ) originating from the 4f‐4f transitions of Sm 3+ ions . On the basis of previous literatures, ones knows that the 4 G 5/2 → 6 H 5/2 transition pertains to the magnetic dipole transition, while the 4 G 5/2 → 6 H 9/2 is related to the electric dipole transition .…”

One‐Pot Synthesis of Homogeneous EuF3 Nanoplates: A Near‐Ultraviolet Light‐Induced Red‐Emitting Bifunctional Platform for in vitro Cell Imaging and Solid‐State Lighting

“…The Fourier transform infrared (FT‐IR) spectrum of the EuF 3 nanoplates in the range of 400–5000 cm −1 was recorded so as to identify the functional groups presented in the studied products, as demonstrated in Figure (d). As revealed, both the intense broad band at 3374 cm −1 and the narrow band at 1640 cm −1 pertained to the stretching vibration of O−H, whereas the sharp peak centered at 1384 cm −1 was associated with the H−O‐H vibration . Apart from these bands, another two relatively weak peaks located at around 1083 cm −1 and 811 cm −1 were attributed to the C−H vibration, demonstrating the appearance of EG on the surface of the EuF 3 nanoplates .…”

Rare‐earth‐free Li5La3Ta2O12:Mn4+ deep‐red‐emitting phosphor: Synthesis and photoluminescence properties

“…It is well‐known that the phosphors are one of the important influence factors on luminescence properties of the phosphors converted LED (pc‐LED), and red phosphor plays an indispensable role. The red emission of rare‐earth (RE) ions (eg, Eu 3+ , Sm 3+ , Pr 3+ , and Eu 2+ ) as the activators has been researched widely, however, the sharp absorption peaks of Eu 3+ , Pr 3+ , and Sm 3+ ions in the ultraviolet (UV)/near UV region, the strict synthesis conditions of Eu 2+ ‐doped nitrides and oxynitrides, and the expensive price of RE materials affect the further applications of Eu 3+ , Pr 3+ , Sm 3+ , or Eu 2+ ‐doped red phosphors. Consequently, the researches of rare‐earth free red‐emitting phosphors attract a lot of attentions.…”