Photoluminescence studies of Eu3+ doped bismuth silicate based phosphor for plant grow LEDs

Abstract

Artificial red lights of good quality are essential for indoor plant growth as it has a wide spectrum effects on photosynthesis rate and photomorphogenic processes of organic plant growth cycle. In present work we report on Eu³⁺ doped Bi₄Si₃O₁₂ (BSO) phosphor for spectroscopic implication in smart plant grow LEDs. Eu³⁺ activated series of Bi₄Si₃O₁₂ phosphor have been prepared via traditional solid-state reaction method. Crystal structure and phase formation characterization is determined by using X-ray diffraction (XRD). Photoluminescence spectra of prepared phosphor shows broad excitation spectra ranging from 200 to 530 nm. The optimal Eu³⁺ doping concentration observed at 3 mol%. Emission spectra observed under the excitation of 270 nm shows broad emission band at 469 nm along with other characteristic peak at 500 nm-710 nm. Observed emission peaks at 622 nm, 656 nm and 702 nm were chosen opt for plant grow lights. The phytochrome PFR absorption spectra of plants matches well with the emission band of our Eu³⁺ doped BSO phosphor and can be considered as a viable choice for solid state lighting and plant grow light LEDs.