Enhanced luminescence of Mn4+:Y3Al5O12 red phosphor via impurity doping

Abstract

Currently, white light-emitting-diodes converted using Ce³⁺:Y₃Al₅O₁₂ phosphor suffer from the shortage of red component and the easy aging of the organic silicone binder. Herein, a novel and non-rare-earth doped Mn⁴⁺:Y₃Al₅O₁₂ red phosphor was synthesized by a traditional solid-state reaction. This phosphor can emit red luminescence attributed to Mn⁴⁺:²E → ⁴A₂ spin-forbidden transition in the 600–700 nm spectral region and can be efficiently excited by both the commercially available near-ultraviolet and blue chips. Impressively, Mg²⁺, Ca²⁺, and Ge⁴⁺ dopants were found to be beneficial for enhancing Mn⁴⁺ luminescence, and the related mechanisms were systematically discussed. Furthermore, Mn⁴⁺:Y₃Al₅O₁₂ embedded inorganic glass ceramic was successfully fabricated to replace the phosphor in organic silicone as the color converter, and a stacking geometric configuration by sequentially coupling a Ce³⁺:Y₃Al₅O₁₂ glass ceramic and a Mn⁴⁺:Y₃Al₅O₁₂ glass ceramic with an InGaN blue chip was designed to explore its possible application in warm white light-emitting diodes.