Promising near-infrared emitting Cr 3+ -doped LaMnAl 11 O 19 phosphors for plant growth LEDs with excellent responsiveness to the phytochrome P FR

For the first time, Cr 3+ is doped in the hexagonal aluminate LaMnAl 11 O 19 , and the near-infrared emission matching with the absorption of photosensitive pigment P FR is realized, which provide a new matrix reference for activator ion doping.