Strongly enhanced luminescence of Sr 4 Al 14 O 25 :Mn 4+ phosphor by co-doping B 3+ and Na + ions with red emission for plant growth LEDs

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(a) Emission spectrum of LEDs fabricated with 445 nm blue chip and Sr 2 Si 5 N 8 :Eu 2+ red phosphor. (b) Emission spectrum of LEDs fabricated with 445 nm blue chip and Sr 4 Al 14 O 25 :Mn 4+ phosphor. (c and d) Absorption spectrum of chlorophyll-b and chlorophyll-a.