A novel efficient single phase dual-emission phosphor with high resemblance to photosynthesis spectrum
Light is as a fuel for photosynthesis and plays an irreplaceable role in seed germination, stem elongation, leaf expansion, flowering induction, and accumulation of nutrients. However, the current phosphors combined with LEDs for photosynthesis have some unsolved problems, such as low efficiency, poor thermal stability, changeless emission wavelength or nonmatched spectrum, which restrict their application. In this work, a series of novel efficient Lu3Al5O12:10%Ca2+,xBi3+,yMn4+ phosphors with blue-violet plus deep red dual-emission peaking at 419 and 669 nm are first reported, which can meet the different light requirements of plants through controlling the concentration ratio of Bi3+ and Mn4+, and possess at most 90.64% spectrum resemblance to the fitting spectrum of chlorophyll A and B. Furthermore, these phosphors exhibit a high internal efficiency and at most reserve 95% of initial intensity at 425 K. Finally, as a light source for monitoring fluorescence spectra of evergreen, the pc-LEDs are fabricated by UV chip and our synthesized phosphors. The results reveal that these phosphors can achieve as high as 83% photosynthetic efficiency for evergreen and obviously improve it by 10% than single emission phosphor, which show a good application prospect for improving plant photosynthesis.