Red phosphor color-converted film with TIO2 producing white light emitting diodes

Abstract

The Na₂GdMg₂(VO₄)₃ (NGMV) has proved to be an exceptional substrate for the doping of trivalent europium ions to produce a novel red phosphor. The paper presents NEuGMV red phosphors, synthesized via the conventional solid-state method, with a focus on evaluating their photoluminescence performance. The obtained results emphasize the latent applications of NEuGMV red phosphors in the context of warm white light emitting diodes (WLEDs). To further investigating the use of NEuGMV red phosphors in developing WLED lighting, a color-converted film, NEuGMV@TiO₂, is developed by incorporating TiO₂ scattering particles and NEuGMV with silicone gel. The relationship between NEuGMV@TiO₂ and the blue-LED-chip emitted light is explored, with particular attention to the impact of varying TiO₂ doping concentrations. Introduction of the NEuGMV@TiO₂ composite introduces a distinct 590-nm red emission peak in the produced light spectrum, effectively mitigating color variation. However, excessive TiO₂ content is observed to diminish the total lumen output due to intense scattered light, thereby elevating the likelihood of light loss. Nonetheless, optimal TiO₂ incorporation leads to the demonstration of NEuGMV@TiO₂ potential as a tunable red-luminescent layer within the WLED system.