Journal
DYES AND PIGMENTS
Volume 152, Issue -, Pages 36-42Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2018.01.022
Keywords
Mn4+ ions; Photoluminescence; Red phosphors; Plant cultivation; Plant growth; LEDs
Funding
- National Natural Science Foundation of China [51502190]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- Start-up Research Grant of Taiyuan University of Technology [Tyutrc201489a]
- Excellent Young Scholars Research Grant of Taiyuan University of Technology [2014YQ009, 2015YQ006, 2016YQ03]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2017-slcIlmd-01]
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Novel Mn4+-activated Ca3La2W2O12 (CLW) phosphors with far-red emission were successfully synthesized by a high-temperature solid-state reaction method. The obtained samples were characterized by powder X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), photoluminescence (PL), decay lifetimes, temperature-dependent emission and internal quantum efficiency (IQE). The CLW:Mn4+ phosphors exhibited an intense broad excitation band in the range of 300-600 nm and gave rise to a strong far-red emission peaking at 711 nm between 650 and 800 tun under near-ultraviolet light (360 nm) or blue light (469 nm) excitation. The CIE chromaticity coordinates and full-width at half-maximum (FWHM) are (0.7125, 0.2858) and 39 nm, respectively. The optimal doping concentration of Mn4+ was about 0.8 mol%, and the concentration quenching mechanism was found to be a dipole-dipole interaction for the Mn4+ activators. Importantly, the CLW:0.8% Mn4+ sample had high IQE of as high as 47.9%. Finally, a LED device was fabricated using a 365 nm ultraviolet emitting LED chip combined with the far-red emitting CLW:0,8%Mn4+ phosphors. Since the emission band of CLW:Mn4+ matched well with the absorption band of phytochrome P-FR under the excitation of light in near ultraviolet to blue, thus the CLW:Mn4+ phosphors have potential application in the indoor plant cultivation.
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