Strong energy transfer induced deep-red emission for LED plant growth phosphor (Y,Ba)3(Al,Si)5O12: Ce3+, Cr3+

Abstract

A new phosphor Y2BaAl4SiO12: Ce3+, Cr3+ yielding much efficient energy transfer from Ce3+ to Cr3+ and strongly emitting deep-far red emission under blue LED excitation has been reported. The doping of Ce3+ into Y2BaAl4SiO12: Cr3+ has greatly enhanced the excitation at blue region with increasing deep-far red emission more than three times. It is highly noticeable that an efficient energy transfer has assisted in the enhancement of the excitation for deep-far red emission illustrated through a stronger 4f→5d transition of Ce3+ than parity-forbidden 4A2→4T1 transition of Cr3+. The yellow emission of Ce3+ was almost completely depressed to nearly zero during the energy transition. The mechanism was considered as dipole-dipole interaction through the decay curve of the yellow emission, where the generation of a strong energy transfer in widely distributed Ce3+ and Cr3+ activators was proceeded through this interaction. It can intensively contribute to a new type of LED plant growth with inducing morphosis of plants under far red light.