Luminescent Properties of SrGeO_3:Eu~(3+) Red Emitting Phosphors for Field Emission Displays

摘要

A novel red emitting phosphor of Eu~(3+) doped SrGeO_3 was prepared through the solid state reaction. XRD, PL and CL were utilized to characterize the samples. Under the excitation of ultraviolet light and low voltage electron beams, SrGeO_3: Eu~(3+) phosphor shows the characteristic ~5Do-~7F_2 transition of Eu~(3+) at around 617 nm. The concentration for optimum luminescence intensity of Eu~(3+) was determined to be 0.04 in SrGeO_3: xEu~(3+) phosphor. The luminescent intensity could be improved by co-doping with the charge compensators of R+ (Na, K) and Ga~(3+) which partially substitute for Sr~(2+) and Ge~(4+) crystal sites, respectively. CL spectra show that Eu~(3+) ions could be excited by the plasma produced by the incident electrons, furthermore, the CL properties of SrGeO_3: Eu~(3+) as a function of accelerating voltage and probe current were investigated. The results indicate that SrGeO_3: Eu~(3+) can be a suitable red-emitting phosphor candidate for FEDs.