Study on deep-red-emitting Li1.6Mg1.6Sn2.8O8:Mn4+ for plant growth lighting and polymer luminescent film
The developments of science and technology have made greenhouse plant cultivation increasingly valued, which has made the research on light sources of great significance, causing that deep-red-emitting phosphors have particular research prospects. In this work, Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ under high-temperature solid-state method is synthesized in air and Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ @PDMS film is prepared. Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ at room temperature shows deep-red emission in the range of 600 – 800 nm with photoluminescence (PL) peaks at ∼660 and 672 nm because of the 2 E g → 4 A 2g transition of Mn 4+ ion in octahedron [MnO 6 ] when it is excited by light from ultraviolet to green (250–540 nm). PL spectra of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ under different excitation wavelength and the time-resolved PL spectra at room temperature are investigated, which confirm one luminous center (Mn 4+ ). The good thermos-stability is proved by the temperature-dependent PL spectra. The potential applications of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ in plant growth lighting and polymer luminescent film are explored via absorption spectra of plants, PL spectrum of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ , and Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ @PDMS film.
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