Abstract
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 SrTiO3 cubic phase, the main emission front is located at 614 nm, corresponding to Pr3+ ions 1D2→3H4 transition emission. SrTiO3:Pr3+, Mg2+ and SrTiO3:Pr3+, Al3+ phosphor luminescence intensity is enhanced, but the main luminescence mechanism is not changed. Acceptor impurity x = Mg2+, Al3+ will replace Ti bit after being doped into the crystal lattice to form XTi- charge compensation corresponding defect centers PrSr+ 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.
Highlights
Field emission display (FED) is a new display technology, with its high quality, low cost, large area of attractive advantages, achieving broad development prospects
FED has the thinness of liquid crystal display (LCD) and the large area characteristics of plasma display (PDP)
Experimental results show that the sample of SrTiO3:0.002molPr3+ luminous intensity is the highest, which is consistent with other related experiments
Summary
Field emission display (FED) is a new display technology, with its high quality, low cost, large area of attractive advantages, achieving broad development prospects. SrTiO3:Pr3+ phosphor generates red light when photoluminescence and cathode-ray excitation. Study found that compensation ion doping can greatly improve SrTiO3:Pr3+ material luminous intensity. Domestic Zhang et al [4] studied Al3+-doping of SrTiO3:0.2%Pr3+:x Al (x = 0∼ 0.35) to improve the performance of red phosphors [5]. SrO layer disappears in SrTiO3 lattice, degree of crystallinity is improved, and luminous enhancement has been improved to some extent. In this experiment, we use the sol-gel method to produce compensating ions Mg2+, Al3+ codoped SrTiO3:Pr3+ red phosphor. The project produces compensating ions doped SrTiO3:Pr3+ red phosphor by the sol-gel method, improving the luminous intensity and persistence time by compensation ions doping method
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