Far red and near infrared double-wavelength emitting phosphor Gd 2 ZnTiO 6 : Mn 4+ , Yb 3+ for plant cultivation LEDs

By Jinmeng Xiang, Jiayu Chen, Niumiao Zhang, He-bao Yao, Chongfeng Guo. Dyes and pigments, 2018

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Abstract Far-red (FR) and near-infrared (NIR) double-wavelength emitting phosphors Gd2ZnTiO6: Mn4+/Yb3+ (GZT: Mn4+/Yb3+) used for light-emitting diodes (LEDs) towards plant cultivation have been synthesized via convenient high-temperature solid-state reaction method. Their structures and luminescent properties were identified by powder X-ray diffraction (XRD) and photoluminescence excitation (PLE) and emission (PL) spectra. The crystal field strength of Mn4+-occupied octahedra [TiO6]8- environment was estimated according to the PL and PLE spectra of the Mn4+ solely doped GZT. Under near ultraviolet light (n-UV) excitation, intense FR emission (ranging from 650 to 720 nm) from Mn4+ and NIR emission (925–1075 nm) from Yb3+ were achieved in Mn4+ -Yb3+ co-doped samples, which matches well with the absorption spectra of the phytochrome PFR and photosynthetic bacteria, respectively. The energy transfer processes from Mn4+ to Yb3+ in GZT: Mn4+/Yb3+ were also investigated in detail, and the FR/NIR intensity ratios could be tuned by adjusting the concentration of Mn4+ and Yb3+ to meet the requirements of different species of plants and bacteria. Results indicated that the present GZT: Mn4+/Yb3+ phosphors possess great potential applications in plant cultivation LEDs.

Subfields: Materials Chemistry, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/4b07c4b51f7f42b07006a34d17d2f8401b89f8bc