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Issue 30, 2017
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Thermally stable KxCs1−xAlSi2O6:Eu2+ phosphors and their photoluminescence tuning

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Abstract

Thermal quenching is one of the most crucial challenges for photoluminescence and high-power applications, in which the phosphor suffers from emission loss due to non-radiative transitions with increasing temperature. Herein, we report new isostructural solid solution phosphors, Eu2+-doped KxCs1−xAlSi2O6 (0 ≤ x ≤ 0.6), with abnormal thermal quenching behavior, and their asymmetric emission spectra and decay curves for two emission centers verified the presence of two kinds of Eu2+ centers (Eu1 and Eu2) in the lattices. The maxima of both the Eu1 and Eu2 bands exhibit a blue-shift and the emission color was tuned from blue-green with color coordinates of (0.222, 0.324) to bright blue with color coordinates of (0.172, 0.132) upon 365 nm UV excitation as a function of x. These phosphors do not exhibit thermal quenching at high temperature, and this behavior is proposed to relate to the energy transfer from defect levels to the Eu2+ 5d band as also verified by thermoluminescence measurements, and the result demonstrated that the reported KxCs1−xAlSi2O6:Eu2+ phosphors may be candidates for blue-green components in UV-pumped high power white light emitting diodes (WLEDs).

Graphical abstract: Thermally stable KxCs1−xAlSi2O6:Eu2+ phosphors and their photoluminescence tuning

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Publication details

The article was received on 08 Jun 2017, accepted on 30 Jun 2017 and first published on 03 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02539D
Citation: J. Mater. Chem. C, 2017,5, 7489-7494
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    Thermally stable KxCs1−xAlSi2O6:Eu2+ phosphors and their photoluminescence tuning

    M. Zhang, Z. Xia and Q. Liu, J. Mater. Chem. C, 2017, 5, 7489
    DOI: 10.1039/C7TC02539D

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