Phosphor

Color temperature

Materials science

Chromatography

Density functional theory

Crystal structure

Color rendering index

Quenching (fluorescence)

Physics

Quantum efficiency

Organic chemistry

Optics

Doping

Fluorescence

Computational chemistry

Analytical Chemistry (journal)

Crystallography

Chemistry

Thermal stability

Light-emitting diode

Optoelectronics

Rietveld refinement

Chemical Engineering Journal

A novel red phosphor LaSc3(BO3)4:Eu3+ with high quantum efficiency and zero-thermal-quenching was reported. The crystal structure and electronic structure were investigated by Rietveld refinement method and density functional theory (DFT) calculations. The FE-SEM and TEM analysis were performed to further understand the phase evolution of LaSc3(BO3)4:Eu3+. The energy migration among Eu3+ ions was strongly suppressed due to the long distance of nearest-neighbor Eu3+ sites. The phosphor exhibited high doping concentration of 80 mol%, high quantum efficiency of 88.3% and zero-thermal-quenching until 275 °C. Further researches show that the zero-thermal-quenching behavior is consistent with the thermal disturbance model. Finally, A warm white light LED device with a low correlated color temperature (CCT) of 3438 K and high color rendering index (CRI) of 92.5 was fabricated based on the as-prepared red phosphor LaSc3(BO3)4:Eu3+, indicating that LaSc3(BO3)4:Eu3+phosphor is promising for high-power LEDs. These findings may open up new ways for the exploration of high-performance Eu3+-activated phosphors.

A red phosphor LaSc3(BO3)4:Eu3+ with zero-thermal-quenching and high quantum efficiency for LEDs