Raman scattering and red emission of Mn⁴⁺ in La_0.7Sr_0.25Na_0.05Mn_0.7Ti_0.3O₃ manganite phosphor for LED applications

Abstract

The vibrational and optical properties of an La0.7Sr0.25Na0.05Mn0.7Ti0.3O3 (LSNMT) polycrystalline sample produced via a solid-state reaction were studied.

Non-rare-earth-doped submicron-grade narrow-band red phosphors for W-LED as well as FED and enhanced Bi3+-doped blue light absorption

“…6(d). 48,49 Due to the similar ionic radii and charge numbers of Mn 4+ and Ge 4+ , the change in the crystal structure is negligible when Mn 4+ is doped into the SGO host. When Bi 3+ with a smaller ionic radius is doped into SGO, the crystal structure will undergo significant lattice vibrations and strong thermal perturbations.…”

Hopping conduction mechanism and impedance spectroscopy analyses of La0.70Sr0.25Na0.05Mn0.70Ti0.30O3 ceramic

“…On the variation of the temperature, the bipolaron can be created as the number of free carriers rises. Indeed, the rise in temperature causes an elevation in the density of free carriers, which leads to the reduction of the encountered barriers and the enhancement of conductivity [27][28][29].…”