Abstract
Artificial light source for indoor cultivation has been vastly impeded by the lack of high far red emitting phosphors. Recently, Mn4+ activated phosphors were reported to be promising luminescent materials to solve above matter. In this study, controllable design of Ca14Al10Zn6O35:0.15Mn4+ (CAZO:0.15Mn4+) far red emitting phosphors was realized via pH assisted hydrothermal approach. The pure CAZO:0.15Mn4+ phosphors were obtained merely when the reaction pH was 1 or 2. Meanwhile, by adjusting the pH value of the reaction solution, far red emission CAZO:0.15Mn4+ phosphors with grains, sphere-like as well as aggregated bulk particles can be achieved at pH = 4, pH = 6 and pH = 10, respectively. Furthermore, the structures and morphologies depended photoluminescence (PL) performances of CAZO:0.15Mn4+ were checked. The best PL performance was found for the phosphor produced at pH = 6, while over acidic or alkaline conditions would lower the emission intensity. In addition, this phosphor also exhibit good thermal resistance which can maintain 78% initial intensity at 150 °C. The practical indoor tobacco cultivation demonstrated that CAZO:0.15Mn4+ obtained through this pH adjusted hydrothermal route is a promising phosphor for indoor plant growth lighting.
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