Preparation of Compensation Ions Codoped SrTiO3:Pr3+Red Phosphor with the Sol-Gel Method and Study of Its Luminescence Enhancement Mechanism

[摘要] SrTiO3:Pr3+is the most representative titanate matrix red phosphor for field emission display (FED). The red luminous efficiency of SrTiO3:Pr3+will be greatly improved after the compensation ions codoping, so SrTiO3:Pr3+red phosphor has been a research focus at home and abroad. SrTiO3:Pr3+, SrTiO3:Pr3+, Mg2+, and SrTiO3:Pr3+, Al3+phosphors are synthesized by a new sol-gel method. Crystal structure, spectral characteristics, and luminescence enhancement mechanism of the sample were studied by XRD and PL spectra. The results showed that after co-doped, SrTiO3:Pr3+phosphor is single SrTiO3cubic phase, the main emission front is located at 614 nm, corresponding to Pr3+ions 1D2→3H4transition emission. SrTiO3:Pr3+, Mg2+and SrTiO3:Pr3+, Al3+phosphor luminescence intensity is enhanced, but the main luminescence mechanism is not changed. Acceptor impurityx= Mg2+, Al3+will replace Ti bit after being doped into the crystal lattice to formXTi-charge compensation corresponding defect centersPrSr+to reduce the demand of Sr2+or Ti3+vacancy. While Sr-doped Pr will make lattice distortion and transition energy of 4f-5d is very sensitive to crystal electric field changes around Pr atom. Doping different impurities will make electric field distribution around the icon have a different change. It increases energy transfer of 4f-5d transition and improves the luminous intensity of SrTiO3:Pr3+red phosphor.

[学科分类] 电子、光学、磁材料