Narrow Results

The Cr${}^{3+}$-activated phosphor can emit far-red light under the excitation of an external light source, mainly due to the transition of the outermost electrons of Cr${}^{3+}$ from the ²E level to the ⁴A₂ level in a strong crystal field environment. A novel far-red Li₂TiO₃: Cr${}^{3+}$ phosphor was prepared by the solid-state method. Under the excitation of 356nm, the Li₂TiO₃: Cr${}^{3+}$ phosphors emit intense far-red light in 600–850nm with a central wavelength of 732nm. The emission band of all samples was matched with the absorption bands of phytochrome P${}_{FR}$. The experimental data and theoretical calculation confirmed that Cr${}^{3+}$ is surrounded by a strong crystal field environment. The effect of Cr${}^{3+}$ doping concentration on the luminescence intensity was analyzed. These research works demonstrate that far-red Li₂TiO₃: Cr${}^{3+}$ phosphors have potential applications in plant growth lights.