A novel Cr3+-activated far-red titanate phosphor: synthesis, luminescence enhancement and application prospect

Dual substitution of host lattice ions to enhance the luminescence properties of Zn2TiO4:Cr3+ phosphor

“…It was found that the doping of Li + –Nb 5+ increased the absorption in ultraviolet, blue, and red ranges, which made the sample better matched with the ultraviolet and blue light chips. The optical band gap ( E g ) was calculated using the following equation: [38]: $$$$ {\left(\alpha hv\right)}^n=A\left( hv-{E}_g\right) $$$$ where A and ν denote constants and frequencies. The absorption coefficient is represented by α .…”

“…It was found that the doping of Li + -Nb 5+ increased the absorption in ultraviolet, blue, and red ranges, which made the sample better matched with the ultraviolet and blue light chips. The optical band gap (E g ) was calculated using the following equation: [38]:…”

Highly efficient and thermostable far-red phosphor for promoting root growth in plants

“…There exists an EPC effect in the Cr 3+ -activated phosphor, which causes the FWHM to increase when the temperature increases. 16,54,55 To evaluate the emission spectrum broadening mechanism caused by the EPC effect, the Huang-Rhys factor was calculated using the following equation: 56,57 FWHM = 2.36S 1/2 ho(coth( ho/2kT)) 1/2 (9) and further simplified as: 56,57…”

“…6,7 Based on the absorption spectra of plant pigments, carotenoids, chlorophyll A, and chlorophyll B absorb 400–480 nm blue-violet light and 660 nm red light and phytochrome P R and P FR absorb 660 nm red and 730 nm far-red light, respectively. 8–10 Blue and red phosphors are now commercially available to provide light for plants, 11–13 but efficient far-red phosphors are lacking, resulting in an inadequate uptake of far-red light by plants. Therefore, considerable efforts have been made to develop efficient far-red phosphors that have a wavelength range of 700–800 nm.…”

Spectroscopically enhanced far-red phosphor Li2Mg3TiO6:Cr3+ and its application prospects to the cold resistance of rice

“…In the intermediate crystal field, 4 T 2 -4 A 2 transitions and 2 E -4 A 2 transitions occur and emit near infrared and far-red light. 16,17 Due to this property, Cr 3+ excited phosphors can be widely used in the field of near-infrared luminescence. For plant illumination, the performance of Cr 3+ in far-red illumination is utilized.…”