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Issue 21, 2017
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Site occupancy and photoluminescence tuning of La3Si6−xAlxN11−x/3:Ce3+ phosphors for high power white light-emitting diodes

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Abstract

A series of blue light excitable yellow-emitting La3Si6−xAlxN11−x/3:Ce3+ (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.1) phosphors were prepared by a high temperature solid state reactions method. The variations in micro-structure and luminescent properties induced by substituting the Al3+/Si4+ ratio in La3Si6−xAlxN11−x/3:Ce3+ and the related mechanism were investigated. Interestingly, the emission spectrum displayed a red-shift by strengthening the longer wavelength component of the spectrum instead of shifting the emission peak, which was verified to be ascribed to the changed site occupancy of Ce3+. The inducement of redistribution of Ce3+ by introduction of Al3+ as well as its influence on local structures were explored. A tunable spectrum could be obtained through controlling the entering rate of Ce3+ at two different sites. The color rendering index of this phosphor system could be greatly improved with sufficient emission efficiency and thermal stability for applications in high power white light-emitting diodes.

Graphical abstract: Site occupancy and photoluminescence tuning of La3Si6−xAlxN11−x/3:Ce3+ phosphors for high power white light-emitting diodes

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Publication details

The article was received on 02 Mar 2017, accepted on 28 Mar 2017 and first published on 28 Mar 2017


Article type: Paper
DOI: 10.1039/C7CE00435D
Citation: CrystEngComm, 2017,19, 2836-2843
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    Site occupancy and photoluminescence tuning of La3Si6−xAlxN11−x/3:Ce3+ phosphors for high power white light-emitting diodes

    F. Du, W. Zhuang, R. Liu, J. Zhong, Y. Liu, Y. Hu, W. Gao, X. Zhang, L. Chen and K. Lin, CrystEngComm, 2017, 19, 2836
    DOI: 10.1039/C7CE00435D

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