PHOSPHORUS, LUMINESCENT MIXTURE AND LUMINESCENT MATERIAL Russian patent published in 2017 - IPC C09K11/08 H01L33/50 

FIELD: chemistry.

SUBSTANCE: phosphorus, luminescent material and luminescent mixture for directly excited alternating current LED chips include luminescent material A with blue afterglow and yellow luminescent material B in a weight ratio (10-70):(30-90). The luminescent material A is at least one of Sr₄Al₁₄O₂₅:Eu²⁺,Dy³⁺; Sr₂MgSi₂O₇:Eu²⁺,Dy³⁺; CaS:Bi³⁺,Na⁺; CaS:Cu⁺,Na⁺ or CaSrS:Bi³⁺. The luminescent material B is at least one of Y₂O₃⋅Al₂O₃⋅SiO₂:Ce⋅B⋅Na⋅P; Y₂O₂S:Mg,Ti; Sr₃SiO₅:Eu²⁺,Dy³⁺; Ca₂MgSi₂O₇:Eu²⁺,Dy³⁺; CaS:Sm³⁺; YAG:Ce or Tb₃Al₅O₁₂:Ce. Luminescent materials A and B are screened on a 500 mesh sieve. LED chips are blue with a wavelength of 460 nm, purple with a wavelength of 400 nm or ultraviolet radiation with a wavelength of 365 nm.

EFFECT: inventions provide stability of luminescence with a slight attenuation of light.

10 cl, 5 dwg, 3 tbl, 18 ex