Synthesis, luminescence properties and potential applications for plant growth: A novel Mn4+-activated SrLa2Al2O7 phosphor with far-red emission

Recent Advances in Light-Conversion Phosphors for Plant Growth and Strategies for the Modulation of Photoluminescence Properties

“…For example, Ye's group has successfully synthesized a series of Mn 4+ -activated SrLa 2 Al 2 O 7 phosphors using a high-temperature solid-phase method. Excited by 365 nm, the phosphor of SrLa 2 Al 2 O 7 : Mn 4+ emits a far-red light with a peak at 731 nm, which matches well with the absorption band of the photosensitive pigment P FR (Figure 8a) [29]. In addition to finding suitable substrates for Mn 4+ -doped far-red emission phosphors, cationic substitution can also be used to adjust the luminescence spectrum.…”

Enhancing the Luminescence of La3Mg2NbO9:Mn4+ Phosphor through H3BO3 and Charge Compensator Co-Doping for Use in Plant Growth Lamps

“…Figure 7 g depicts that the luminescence intensity of LMN:Mn 4+ , LMN:Mn 4+ ,B, and LMN:Mn 4+ ,B,Li + can maintain 47.3%, 66.7%, and 68.9% of the initial intensity at 423 K. The results show that the doping of H 3 BO 3 and Li + ions significantly improved the thermal stability of the materials, which further demonstrates the effectiveness of the above-described H 3 BO 3 and Li + ion doping in reducing the probability of non-radiative transitions [ 43 ]. As shown in Table 3 , the results from the LMN:Mn 4+ ,B,Li + sample display greater thermal stability compared to some other up-to-date studies of Mn 4+ -doped oxide phosphors, such as Sr 2 LuTaO 6 :Mn 4+ (I 423 K /I 298 K = 25%) [ 9 ], SrLa 2 Al 2 O 7 :Mn 4+ (I 423 K /I 298 K = 43%) [ 34 ], CaY 0.5 Ta 0.5 O 3 :Mn 4+ (I 423 K /I 298 K = 50%) [ 44 ], CaLaLiTeO 6 :Mn 4+ (I 423 K /I 298 K = 63%) [ 45 ], Mg 3 Ga 2 SnO 8 :Mn 4+ (I 423 K /I 298 K = 50%) [ 46 ], Cs 2 NbOF 5 :Mn 4+ [ 47 ], and Li 6 SrLa 2 Sb2O 12 : Mn 4+ [ 48 ].…”

“…According the above equations, the results of D q , B, and C values for Mn 4+ in the LMN are 1984.1, 724.1, and 2911.3 cm −1 . Generally speaking, when D q /B is greater than 2.1, the dopant ions are generally considered to be in a strong crystal field environment [ 34 ]. Here, the D q /B value is calculated as 2.74, indicating that the Mn 4+ ions are located in a strong crystal field.…”

Frontiers of Deep-Red Emission of Mn4+ Ions with Ruddlesden–Popper Perovskites

“…Based on the Racah parameters from Table the nephelauxetic parameter β 1 was calculated, which is known to have a good quasi-linear correlation with the energy of the 2 E state (eq S4). The results obtained for the R-P materials are compared with those for other representative host materials in Table S3 and Figure S14. ,,− ,,,,− Indeed, the proposed materials present both the lowest 2 E energies as well as some of the lowest β 1 values. Furthermore, it should be noted that the obtained results fit into a linear trend that has been reported so far in several reviews…”