Crystal structure and photo-luminescence of Gd3Ga2(Al3-ySiy)(O12-yNy):Ce3+ phosphors for AC-warm LEDS.

Highlights • A new orange phosphor GGAON 0.5 :Ce3+ with sufficient red component was synthesized. • No decay in the 10 microsecond is the key feature applied in AC-circuit directly. • Self-packed LED lamp emits warm white light with high rendering index. Abstract Solid solution phosphors Gd 3 Ga 2 (Al 3- y Si y)(O 12- y N y):Ce3+ were synthesized by introducing [Si4++N3–]/[Al3++O2–] co-substitution into the lattice of Gd 3 Ga 2 Al 3 O 12 :Ce3+. Gd 3 Ga 2 Al 3 O 12 :Ce3+, characteristic as outstanding light yield (about 50–60 kPh/ MeV), and has been applied in computer tomography (CT), positron emission tomography (PET) nuclear medical detector, et al. With the increase of y value, the coordination environment around Gd3+(Ce3+) shrinked, which were confirmed by combining techniques of structure refinement, energy- dispersive spectrum, elements distribution mapping. As a result, stronger 5 d orbital nephelauxetic effect (ε c) and bigger 5 d energy level splitting (ε cfs) were induced. Thus resulting in longer wavelength of excitation and emission from Ce3+, and broadening of emission spectra. The typical sample Gd 2.95 Ga 2 Al 2.5 Si 0.5 O 11.5 N 0.5 :0.05Ce3+ (GGASON 0.5 :Ce3+) exhibits sufficient red component and persistent luminescence(>10 ms), enables fabrication of warm white light suited for alternating-current (AC) when combined with blue light chip (460 nm). [ABSTRACT FROM AUTHOR]