Photoluminescence and structural properties of Ca3Y(VO4)3:RE3+ (=Sm3+, Ho3+ and Tm3+) powder phosphors for tri-colors

Theoretical spectra identification and fluorescent properties of reddish orange Sm-doped BaTiO 3 phosphors

“…In these excitation spectra, there is a characteristic excitation spectrum centered at 409 nm, which should be ascribed to 6 P 3/2 (C 7 ) ? 6 H 5/2 (C 7 ) transition [11,4,10], suggesting that the excitation wavelength of as-grown phosphors matches well with the near-UV light LED chips. Besides, the other spectra centered at 382, 391, 422, 442, 465, 482 and 500 nm as well as their originations will be discussed in the next section.…”

“…Rare-earth (RE) elements doped phosphors, due to the inherent chemical and physical stability ascribed to a partially filled inner (4f n ) shell shielded from its surroundings by completely filled outer (5s 2 and 5p 6 ) orbitals, reach overwhelming superiority over other phosphors in the fields of optoelectronic and photonic applications, ranging from solid-state lasers, displays to optical fiber telecommunication and phosphors for colors lamps [1][2][3][4][5][6][7][8][9]. Among them, trivalent samarium Sm 3+ with 4f 5 configuration has the excellently stable emission spectra in the range of visible light originated from the various possible transitions among 6 H , 6 P , 4 G, 4 F, 4 I, and 4 M, suggesting that Sm 3+ -doped phosphors for the application of light emitting diodes (LEDs), especially for white LEDs [10,11,4].…”

“…Among them, trivalent samarium Sm 3+ with 4f 5 configuration has the excellently stable emission spectra in the range of visible light originated from the various possible transitions among 6 H , 6 P , 4 G, 4 F, 4 I, and 4 M, suggesting that Sm 3+ -doped phosphors for the application of light emitting diodes (LEDs), especially for white LEDs [10,11,4]. However, the identifications of those spectra were often determined through the previous reports and then their mechanisms are quite unphilosophical to date.…”

“…6 H 5/2 (C 7 ) (561 nm), 4 G 5/2 (C 7 ) ? 6 H 7/2 (C 7 ) (595 nm) and 4 G 5/2 ? 6 H 9/2 (C 7 ) (637 nm).…”

Structural, Luminescence, and Electronic Properties of Potassium Holmium Cyclotetraphosphate KHoP4O12: Experiment and Theory

“…There are three blue light emissions around 467, 481, and 493 nm in the visible region, which result from the intraconfigurational electronic transitions of the Ho 3+ ion. [27][28][29] These strong emission bands are mainly caused by the 5 F 3 Ǟ 5 I 8 transition.…”