Photoluminescence properties of Tb3Al5O12:Ce3+, Mn2+ phosphor ceramics for high color rendering index warm white LEDs

Tb3Al5O12:Ce3+, Mn2+ (TAG:Ce3+, Mn2+) phosphor ceramics with different doping of Mn2+-Si4+ ions pair were fabricated by the high temperature solid state reaction in a flowing oxygen atmosphere. The emission colors could be changed from yellow-green to orange-red through controlling the doping concentration of Mn2+-Si4+ ions in the TAG:Ce3+, Mn2+ phosphor ceramics. The red emission from the phosphor ceramics mainly came from the 4T(1)-> 6A(1) transition of Mn2+ ions via the Ce3+-> Mn2+ energy transfer under the 460 nm excitation. With the increase of Mn2+ doping concentration, the emission peak of the emission spectrum could reach 605 nm. By combining the optimized phosphor ceramic with the 460 nm commercial blue light emitting diode (LED) chip, the white light with low correlated color temperature (CCT) of 3426 K and high color rendering index (CRI) of 84.4 was obtained, indicating the good potential of TAG:Ce3+, Mn2+ phosphor ceramics for warm white LED applications.

Automated summary

The Tb3Al5O12:Ce3+, Mn2+ phosphor ceramics were fabricated with different doping concentrations of Mn2+-Si4+ ions pair, allowing for emission colors to be changed from yellow-green to orange-red. Red emission was mainly attributed to transitions of Mn2+ ions via energy transfer under 460 nm excitation. By optimizing the phosphor ceramic with 460 nm blue LED chip, a white light with low CCT of 3426 K and high CRI of 84.4 was achieved, showcasing the potential for warm white LED applications.