Regulation of red to near-infrared emission in Mn2+ single doped magnesium zinc phosphate solid-solution phosphors by modification of the crystal field

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2015-12, Vol.3 (48), p.12443-12449
• Main Authors: Ma, Y. Y, Hu, J. Q, Song, E. H, Ye, S, Zhang, Q. Y
• Format: Article
• Language: English
• Subjects: Crystals; Decay; Diffraction patterns; Field strength; Near infrared radiation; Phosphates; Phosphors; Spectra
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/c5tc03116h

A series of novel red to near infrared (NIR) emitting (Mg 1− x Zn x ) 2.97 (PO 4 ) 2 :0.03Mn 2+ ( x = 0, 0.2, 0.4, 0.5, 0.6 and 0.8) phosphors were prepared by a solid-state synthesis route at 1000 °C. The X-ray diffraction (XRD) patterns confirmed the (Mg 1− x Zn x ) 3 (PO 4 ) 2 solid solution phase. In addition, the characteristic photoluminescence (PL), decay times and temperature dependent luminescence properties were investigated in detail. The different Mg/Zn ratios resulted in various PL intensities and spectra profiles, which were related to the crystal field strength and local environment of the Mn 2+ ions. The probabilities of energy transfer were discussed according to the time-resolved PL spectra. Moreover, the thermal quenching property of the samples was investigated and discussed according to the configuration coordinate diagram. The Mn 2+ single doped phosphate (Mg 1− x Zn x ) 3 (PO 4 ) 2 were added to the family of phosphors which can be applied to light emitting diodes as well as in vivo bio-imaging. The different Mg/Zn ratios of (Mg 1− x Zn x ) 2.97 (PO 4 ) 2 :0.03Mn 2+ result in various PL intensities and spectra profiles, which are related to the crystal field strength and local environment of the Mn 2+ ions.