Mn⁴⁺-activated oxyfluoride K₃TaOF₆ red phosphor with intense zero phonon line for warm white light-emitting diodes.

ABSTRACT: The intense zero phonon line (ZPL) of the Mn⁴⁺:²E→⁴A₂ transition can further promote the color rendering and luminous efficiency for high-quality white-emitting diodes (w-LEDs). In this article, a Mn⁴⁺-activated K₃TaOF₆ oxyfluoride red phosphor was synthesized via a facile two-step method. Its phase and morphology were characterized by X-ray diffraction, SEM and TEM. The as-prepared K₃TaOF₆:Mn⁴⁺ exhibits an intense absorption of blue light and a strong emission band peaking at 628 nm with a color purity as high as 96.4%. Attributed to the distorted octahedral coordination environment of Mn⁴⁺ ions, an intense ZPL emission was detected at 620 nm. By theoretical calc

SUBMITTER: Wu J 

PROVIDER: S-EPMC9037339 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature