Narrow-Band Green-Emitting Magnetoplumbite-Structured CeZnAl₁₁O₁₉:Mn²⁺ Phosphor for Wide Color Gamut Backlighting

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Magnetoplumbite-type materials are explored for phosphorescent applications.
• Luminescent properties are sensitive to doping and crystal structure modifications.

Purpose of the Study:

• To synthesize and characterize a novel narrow-band green-emitting phosphor.
• To investigate the luminescence properties and thermal stability of CeZnAl11O19:Mn2+.
• To evaluate its potential for white LED applications.

Main Methods:

• Solid-state synthesis of CeZnAl11O19:Mn2+ by substituting LaMgAl11O19.
• Photoluminescence spectroscopy to analyze emission spectra and quantum efficiencies.
• Thermal quenching measurements and temperature-dependent full width at half maximum (fwhm) analysis.

Main Results:

• Optimized CeZn0.65Al11O19:0.35Mn2+ exhibits green emission peaking at 517 nm with a narrow fwhm of 30 nm.
• Achieved internal/external quantum efficiencies of 75%/19% and low thermal quenching (29% reduction at 473 K).
• Demonstrated weak electron-phonon coupling (S=0.74, phonon energy=62.8 meV), minimizing thermal broadening.

Conclusions:

• CeZnAl11O19:Mn2+ is a promising narrow-band green-emitting phosphor with excellent thermal stability.
• The developed phosphor enables white LED devices with high luminous efficiency (~50 lm/W) and a wide color gamut (117% NTSC).
• This material is well-suited for wide color gamut white LED backlighting applications.