Synthesis and luminescence properties of apatite-type red-emitting Ba2La8(GeO4)6O2:Eu3+ phosphors

Facile synthesis strategy for cesium tin halide perovskite crystals toward light emitting devices and anti-counterfeiting flexible fiber

“…5b). The color purity of Cs 2 Sn 1−x Te x Cl 6 PCs can be calculated from eqn (3): 34 Color purity ¼…”

Modeling Polyhedron Distortion for Mechanoluminescence in Mixed-Anion Compounds RE2O2S:Ln3+

“…The emission spectra of Eu 3+ provide a sensitive tool to evaluate the coordination environment of the luminescent centers. − Typically, the Eu 3+ spectra are composed of multiple emissions due to the 5 D 0 → 7 F J ( J = 0–6) transitions, in which (i) the 5 D 0 - 7 F 1 transition is only partially allowed through the magnetic dipole selection rule, and its intensity is relatively independent of the site symmetry, and (ii) the 5 D 0 - 7 F 2 is a forced electric dipole transition, and its intensity is proportional to the square of the ligand dipolar polarizability. − Consequently, the ratio of R 21 , which is defined as the intensity ratio of the 5 D 0 - 7 F 2 transition relative to the 5 D 0 - 7 F 1 , is an optical indicator to show the degree of distortion from the centrosymmetric geometry for Eu 3+ . − According to Figure c,d, the 5 D 0 → 7 F 2 transition (bands at 611 and 626 nm) dominates the emission spectra in both compounds. The calculated R 21 values are 6.59 and 5.28 for Y 2 O 2 S:Eu 3+ and Y 2 O 3 :Eu 3+ , respectively.…”

Tb3+ and Sm3+ co-doped Ca2La3(SiO4)3F phosphor: synthesis, color regulation, and luminescence properties

“…Light emitting diodes (LEDs) are considered to represent the fourth generation of light sources in the general lighting industry because of their exceptional and unique qualities. [1][2][3] Because LEDs possess attractive colors, a tiny form factor, and ease of construction, they have widespread usage in the decoration and night illumination of cities. [4][5][6] Combining phosphors with n-UV chips (350-420 nm) is one approach that LEDs gives practical colors in their light output.…”