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Medientyp:
E-Book
Titel:
Phase Transition from La2ti2o7 to Latio3 Induced by Li+ Doping
:
Enhanced Local Symmetry and Particle Uniformity Achieved an Efficient Mn4+ Activated Far Red Phosphor for Agricultural Cultivation
Beschreibung:
In this paper, a phase transition from perovskite-layer-structured (PLS) La2Ti2O7 to perovskite type LaTiO3 induced by Li+ doping was observed. The [TiO6] octahedral site symmetry and particle uniformity showed an obvious variation with the phase transition from La2Ti2O7 to LaTiO3. A broadband far-red emission from 670 to 780 nm emerged in the phase transition process when Mn4+, Li+ ions were co-doped. Furthermore, (Mn4+, Li+) co-doped LaTiO3 phosphor can be effectively excited by near-UV and blue lights, which is suitable for combining with commercial LED chips. The LaTiO3:0.4%Mn4+, 150%Li+ phosphor exhibited a high quantum efficiency of 71.1% and a good thermal stability with emission intensity retained 65% at 423 K. Finally, a LED device was fabricated with the LaTiO3:0.4%Mn4+, 150%Li+ phosphor, which matches well with the absorption of photochrome of PFR and shows a good potential for use in agricultural cultivation fields