Using multi-site substitution to design blue-exciting phosphor Mg2Y2Al2Si2O12:Mn2+ for full-spectrum plant growth LEDs

Highlights: • This work designs a kind of phosphor, which is the single host doped single activated ion, with multiple emission. • The special garnet structure is selected in which only Mn²⁺ is doped, to obtain green, red and deep red emission spectra. • A full-spectrum plant growth LED phosphor excited by blue light is obtained, which emission covers 500 nm to 850 nm. Full-spectrum plant growth light emitting diode (LED) prepared using a variety of phosphors has some problems, such as energy loss and spectral distortion. It is the solution that designing a kind of phosphor, which is the single activated ion doped phosphor with the multiple emission. To achieve this goal, the host Mg₂Y₂Al₂Si₂O₁₂ (Abbreviated as: MYASO) was selected from a large number of garnet materials which has the multi-sites, and the Mn²⁺ was selected as the activated ion which can produce the different emission in the different crystal field. The results show that Mn²⁺ can produce the green light (536 nm), red light (635 nm) and deep red light (735 nm), which correspond to the Mn²⁺ substituting for the tetra-coordinated Al³⁺, the octa-coordinated Mg²⁺ and the hexa-coordinated Mg²⁺, respectively, importantly, this phosphor can be efficiently excited by the 456 nm blue light, which matches well with the blue LED chip. Therefore, it may be a great potential application value in the production of plant growth LEDs.