A Novel Efficient Mn⁴⁺ Activated Ca₁₄Al₁₀Zn₆O₃₅ Phosphor: Application in Red-Emitting and White LEDs

Abstract

A new, highly efficient deep red-emitting phosphor Ca14Al10Zn6O35:Mn(4+) was developed as a component of solid-state white light-emitting diodes (LEDs). The structural and optical characterization of the phosphor is described. The phosphor exhibits strong emission in the range of 650-700 nm when excited by 460 nm excitation, with a quantum efficiency approaching 50%. Concentration dependence of Mn(4+) luminescence in Ca14Al10Zn6O35:Mn(4+) is investigated. Attempts to understand the thermal stability on the basis of the thermal quenching characteristics of Ca14Al10Zn6O35:Mn(4+) is presented. The results suggest that phosphors deriving from Ca14Al10Zn6O35:Mn(4+) have potential application for white LEDs. In addition, influence of cation substitution on the luminescence intensity of these phosphors is elucidated.

Recent progress in luminescence tuning of Ce3+and Eu2+-activated phosphors for pc-WLEDs

“…On the other hand, some non-rare-earth-based luminescent materials like semiconducting quantum dots, [154][155][156][157][158][159] Mn 4+activated red-emitting materials (aluminates, silicates, fluorosilicate, fluorotitanate) [160][161][162][163][164][165][166][167][168] and defect-related luminescent materials show excellent luminescence properties under n-UV and blue light excitation. The spectral tuning based on the above approaches can improve the luminescence performance of pc-WLED phosphors such as improving the luminous efficiency, optimizing the color rendering properties, achieving the desired color temperature, enhancing the color gamut and so on.…”

Insight into a novel rare‐earth‐free red‐emitting phosphor Li3Mg2NbO6:Mn4+: Structure and luminescence properties

“…As one of the important non-rare-earth activators, Mn 4+ is featured by the sharp red emission lines and broad excitation band due to its distinct outer 3d 3 electron configuration. 21 23 and so on. Thus, warm WLED can be reached by employing Mn 4+ -activated fluoride phosphors plus YAG:Ce 3+ , which has been demonstrated in many cases, including K 2 SiF 6 :Mn 4+ , 16 K 2 TiF 6 :Mn 4+ , 12 K 3 AlF 6 , 18 K 3 ScF 6 , 19 etc.…”

Preparation, structural and photoluminescence characteristics of novel red emitting Mg7Ga2GeO12:Mn4+ phosphor

“…Recently, Mn 4+ -doped phosphors, which can be synthesized under air conditions, have received great interest [10]. They can exhibit broad and strong absorption in the blue region and emit emissions in deep red region.…”

“…However, the Mn 4+ ions can not availably emit in most of common hosts, unless the Mn 4+ dopants replace the symmetrical A sits of AO 6 polyhedra [10]. Therefore, it is necessary for us to choose a proper host which contains AO 6 polyhedra.…”