The invention provides a group of composite
fluorescent materials and a preparation method thereof. A fluorescent complex is composed of a
fluorescence main phase and a second phase, wherein the
fluorescence main phase takes
oxygen as a main anionic ligand and
rare earth as activated ions, and the second phase is
inert elemental
metal including Au, Ag, Pd, Pt, Rh, Ir, Ru, Os and the like. Low
phonon energy
inert elemental metals are distributed in main
phase domain or on domain boundary of the
fluorescence main
phase domain structure in the form of a second phase micro-domain, so that the
light intensity and the anti-heat
damping capacity of the fluorescence main phase is improved. Part of
oxygen in the complex fluorescent main phase lattice can be replaced by trivalent
nitrogen ions and monovalent
halogen ions together to adjust the micro
crystal field environment in the lattice to achieve fine adjustment of the emission
wavelength. The composite fluorescent material is prepared by a
solid phase reaction process using the microparticles of the
inert elemental metals as a
seed crystal, can be excited by UV-blue-
green light to obtain emission from blue to
orange light, and can be applied to manufacturing efficient LED devices.