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Issue 43, 2016
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Synthesis and photoluminescence properties of a phase pure green-emitting Eu doped JEM sialon (LaSi6−zAl1+zN10−zOz, z ∼ 1) phosphor with a large red-shift of emission and unusual thermal quenching behavior

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Abstract

A green-emitting phosphor, Eu2+ doped LaAl(Si6−zAlz)(N10−zOz) (denoted as JEM, z ∼ 1), was synthesized via a solid-state reaction method. By the careful control of the sintering temperature and chemical composition of starting materials (z value, N/O ratio and Si/Al ratio), a single phase JEM phosphor was achieved for the first time. The JEM:Eu2+ phosphor displays a broad 4f–5d excitation band from the UV region up to 525 nm, with a maximum at 355 nm. Excitation at 355 nm results in a Eu2+ 5d–4f emission band, that shows a large red-shift (490 → 564 nm) and a change in shape with increasing Eu concentration. The thermal quenching behavior of JEM:Eu2+ has been investigated in the temperature range from 4 K to 573 K. An abnormal nearly linear relation is observed between temperature and luminescence intensity. These phenomena indicate that there are two types of Eu2+ sites, although only one crystallographic site can be found in the JEM structure. A non-linear decay behavior with a bi-exponential curve and time-resolved photoluminescence emission spectra with two distinctive Gaussian peaks further give strong evidence for two emission sites in the Eu2+ doped JEM phosphor.

Graphical abstract: Synthesis and photoluminescence properties of a phase pure green-emitting Eu doped JEM sialon (LaSi6−zAl1+zN10−zOz, z ∼ 1) phosphor with a large red-shift of emission and unusual thermal quenching behavior

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Publication details

The article was received on 31 May 2016, accepted on 02 Oct 2016, published on 03 Oct 2016 and first published online on 03 Oct 2016


Article type: Paper
DOI: 10.1039/C6TC02229D
Citation: J. Mater. Chem. C, 2016,4, 10358-10366
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    Synthesis and photoluminescence properties of a phase pure green-emitting Eu doped JEM sialon (LaSi6−zAl1+zN10−zOz, z ∼ 1) phosphor with a large red-shift of emission and unusual thermal quenching behavior

    C. Wang, T. Takeda, O. M. ten Kate, R. Xie, K. Takahashi and N. Hirosaki, J. Mater. Chem. C, 2016, 4, 10358
    DOI: 10.1039/C6TC02229D

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