3: Ce 3+, Eu 2+ multicolor phosphor through Ce 3+-Eu 2+ energy transfer]]>

摘要

AbstractA series of single-component CaAlSiN3: Ce3+, Eu2+phosphors with dual emission colors (yellow and red) were successfully preparedviaa direct-nitriding method to achieve spectral tuning and broadening of CaAlSiN3: Eu2+red phosphor. Crystal structure, morphology, photoluminescence properties and energy transfer mechanism were thoroughly investigated. The particular plate-like morphology of CaAlSiN3: Ce3+, Eu2+phosphor was obtained due to the lattice distortion and preferential orientation growth of host lattice originated from the introduction of Ce3+into CaAlSiN3. More interestingly, the luminescent intensity of red emission peak was enhanced through an energy transfer process between Ce3+and Eu2+ions. Under excitation of 460?nm, CaAlSiN3: 0.02Ce3+, 0.001Eu2+phosphor exhibited intense and broad emission peaks centered at 580?nm (yellow) and 618?nm (closely near to the red isochromatic region around 615?nm). Furthermore, the energy transfer mechanism from Ce3+to Eu2+ion was determined to be electric dipole-dipole interaction and the energy transfer efficiency was 94%. The CaAlSiN3: Ce3+, Eu2+phosphors showed super broad excitation spectra from 270 to 500?nm, high external quantum efficiency (74%) and small thermal quenching. Evidently, CaAlSiN3: Ce3+, Eu2+samples may be potential candidates of red phosphor for improving optical performance of illumination-grade light sources.Highlights?Spectral tuning and broadening for CaAlSiN3based red emitting phosphor are achieved.?Single-component CaAlSiN3: Ce3+, Eu2+multicolor phosphors have been prepared.?Ce3+doping results in lattice distortion and plate-like morphology of host crystal.?Energy transfer mechanism is determined to be electric dipole-dipole interaction.]]>