Diffusing Mn⁴⁺ into Dy³⁺ Doped SrAl₂O₄ for Full-Color Tunable Emissions

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Strontium aluminate (SrAl₂O₄) is a promising host material for phosphors.
• Doping with rare-earth ions like Dysprosium (Dy³⁺) and transition metals like Manganese (Mn⁴⁺) can modify luminescence properties.

Purpose of the Study:

• To synthesize Dy³⁺ and Mn⁴⁺ codoped SrAl₂O₄ phosphors.
• To investigate the effect of diffusion temperature and time on the luminescence of these phosphors.
• To achieve full-color tunable emissions in SrAl₂O₄:Dy³⁺,Mn⁴⁺.

Main Methods:

• Constant-source diffusion technique was employed to codope SrAl₂O₄ with Dy³⁺ and Mn⁴⁺.
• Varying diffusion temperatures (800 °C and above) and diffusion times were used.
• Luminescence properties were analyzed to determine emission characteristics.

Main Results:

• Efficient red emission peaking at 651 nm was achieved for SrAl₂O₄:Dy³⁺,Mn⁴⁺ at diffusion temperatures of 800 °C and higher.
• Mn⁴⁺ red emission dominated Dy³⁺ emissions at 900 °C or above.
• Red emission intensity was more sensitive to diffusion temperature than diffusion time.

Conclusions:

• Full-color tunable emissions are achievable in SrAl₂O₄:Dy³⁺,Mn⁴⁺ by controlling diffusion parameters.
• This method provides an accessible route for color control in Dy³⁺-doped inorganic phosphors.
• The developed phosphors hold potential for applications requiring tunable color emission.