Research Of Red Phosphors Base On Calcium Silicate

White light emitting diodes(W-LEDs)is becoming the fourth generation light with the lower energy consumption,long life and high luminescence efficiency.Silicates phosphors were a kind of practically significant material with developed prospect in the field of solid state lighting due to the excitation spectrum which matched blue and ultraviolet emission.A kind of red phosphor Ca_2-xSr_xMgSi₂O₇:Eu³⁺whose structure was the single phase of tetragonal was synthesized by solid-state reaction using Na F as fluxing agent.The main emission peak was at 589nm under the near UV wavelength excitation located 411nm.The luminescent intensity changed greatly when doped amount of Sr²⁺,Eu³⁺activated ion,R⁺(Li⁺?Na⁺?K⁺)charge compensating agent and different fluxing agent.Furthermore,the luminescent intensity was improved when Eu³⁺,Mn²⁺co-doped Ca_2-xSr_xMg Si₂O₇phosphors.Wollastonite(CaSiO₃)glass ceramics with Sm³⁺activated were synthesized by single sintering ethod and its main emission peak was at 590nm belong to the transition of⁴G_5/2?⁶H_5/2under the near UV wavelength excitation located 413nm.The luminescent intensity changed greatly with different sintering method,temperature and doped amount of Sm²⁺.A concentration quenching effect was observed in the phosphors when the concentration of Sm³⁺was over 0.05%.Diopside(Ca Mg Si₂O₆)glass ceramics with Eu³⁺activated were synthesized by single sintering method and its main emission peak was at 590nm under the near UV wavelength excitation located 415nm.The luminescent intensity changed greatly with different sintering method,temperature and doped amount of Eu³⁺.A concentration quenching effect was observed in the phosphors when the concentration of Eu³⁺was over 0.2%.The excitation spectrum of silicate phosphors with rare earth ions activated Ca_2-xSr_xMg Si₂O₇:Eu³⁺,wollastonite glass ceramics with Sm³⁺activated and diopside glass ceramics with Eu³⁺activated matched the requirement of blue and ultraviolet emission which expanded the practical value in luminescence materials.