Realizing a novel dazzling far-red-emitting phosphor NaLaCaTeO6:Mn4+ with high quantum yield and luminescence thermal stability via the ionic couple substitution of Na+ + La3+ for 2Ca2+ in Ca3TeO6:Mn4+ for indoor plant cultivation LEDs

Abstract

A novel dazzling far-red-emitting phosphor NaLaCaTeO₆:Mn⁴⁺ (NLCTO:Mn⁴⁺) with superior photoluminescence properties was found via an ionic couple substitution strategy of Na⁺ + La³⁺ for 2Ca²⁺ in non-luminous Ca₃TeO₆:Mn⁴⁺ for the first time, which is originated from the significant distortion of TeO₆ octahedra. The results indicate that the ionic couple substitution strategy is a feasible guide to explore novel Mn⁴⁺-involved oxide phosphors for potential application in plant cultivation LEDs.