A red phosphor BaTiF6:Mn4+: reaction mechanism, microstructures, optical properties, and applications for white LEDs

Red phosphors BaTiF6: Mn4+ with microrod and polyhedron morphologies have been prepared respectively by etching TiO2 and Ti(OC4H9) 4 in a HF solution with an optimized concentration of KMnO4 at 1.5 mmol L-1 in hydrothermal conditions. The red phosphor BaTiF6: Mn4+ exhibits a broad excitation band in the blue region and sharp emission peaks in the red region. A white LED (WLED) fabricated with the red phosphor BaTiF6: Mn4+ shows warm white light that possesses a color rendering index of 93.13 at a color temperature of 4073.1 K.