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Issue 44, 2015
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Tunable green to yellowish-orange phosphor Na3LuSi2O7:Eu2+,Mn2+via energy transfer for UV-LEDs

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Abstract

A series of Eu2+,Mn2+-doped Na3LuSi2O7 (NLSO) phosphors have been prepared via the high-temperature solid-state reaction route. X-ray diffraction (XRD), Raman and Fourier transform infrared (FT-IR) spectra, fluorescent decay times, photoluminescence (PL) including temperature-dependent PL properties and scanning electron microscopy (SEM) were used to characterize the as-prepared samples. In Eu2+ singly-doped NLSO samples, an intense green emission is presented under UV excitation. A tunable color from green to yellowish-orange was generated when Mn2+ ions were co-doped into the NLSO:Eu2+, which is based on the energy transfer from Eu2+ to Mn2+ ions. The energy transfer from Eu2+ to Mn2+ ions can be speculated to be due to the wide spectral overlap between the Eu2+ emission and Mn2+ excitation spectra in Eu2+ or Mn2+ singly-doped NLSO samples. This is demonstrated by the similar excitation spectra of the Eu2+ and Mn2+ emission bands and the decreases in Eu2+ emission intensity and decay lifetime with the increase of Mn2+ concentration in the NLSO:Eu2+,Mn2+ samples. The energy transfer mechanism from Eu2+ to Mn2+ ions was determined to be a dipole–quadrupole interaction by the concentration quenching and spectral overlap methods. The maximum quantum yield can reach 51.5% for NLSO:0.01Eu2+,0.12Mn2+. The above results indicate that NLSO:Eu2+,Mn2+ could be a candidate as a green to yellowish-orange component for UV-excited w-LEDs.

Graphical abstract: Tunable green to yellowish-orange phosphor Na3LuSi2O7:Eu2+,Mn2+via energy transfer for UV-LEDs

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Publication details

The article was received on 02 Sep 2015, accepted on 06 Oct 2015 and first published on 08 Oct 2015


Article type: Paper
DOI: 10.1039/C5TC02759D
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J. Mater. Chem. C, 2015,3, 11618-11628

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    Tunable green to yellowish-orange phosphor Na3LuSi2O7:Eu2+,Mn2+via energy transfer for UV-LEDs

    K. Li, M. Xu, J. Fan, M. Shang, H. Lian and J. Lin, J. Mater. Chem. C, 2015, 3, 11618
    DOI: 10.1039/C5TC02759D

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