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(Ca0.8Mg0.2Cl2/SiO2):Eu2+: a violet-blue emitting phosphor with a low UV content for UV-LED based phototherapy illuminators

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Abstract

(Ca1−xyMgxSryCl2/SiO2):Eu2+ phosphors with intense violet-blue emission were synthesized through a high temperature solid-state reaction method. The colour of the emission is tunable from violet-blue to blue as well as to the violet spectral region by adjusting the concentration of Mg2+ or Sr2+, respectively. An abnormal shift in emission wavelength with the ratio of alkaline earth metal ions was observed and explained by combining electronegativity with the crystal field splitting equation. The UV light content in the emission spectra of (Ca0.8Mg0.2Cl2/SiO2):0.003Eu2+ was successfully reduced below 0.1%, thus providing a safer violet-blue light source for phototherapy. Moreover, the measurement results showed an emission band peaked at 440 nm with a full-width at half maximum of 40 nm under 343 nm excitation, which matches with the most effective range for the treatment of hyperbilirubinemia. CIE chromaticity coordinates of (0.156, 0.044) and an internal quantum efficiency of 41.7% were obtained. The temperature-dependent photoluminescence spectra of (Ca0.8Mg0.2Cl2/SiO2):0.003Eu2+ were also presented. These excellent properties reveal that the violet-blue emitting phosphor could be a potential candidate in converting near-UV radiation to violet-blue emission for phototherapy when combined with UV LED chips.

Graphical abstract: (Ca0.8Mg0.2Cl2/SiO2):Eu2+: a violet-blue emitting phosphor with a low UV content for UV-LED based phototherapy illuminators

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Publication details

The article was received on 19 Jan 2019, accepted on 31 Jan 2019 and first published on 02 Feb 2019


Article type: Paper
DOI: 10.1039/C9NJ00328B
Citation: New J. Chem., 2019, Advance Article

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    (Ca0.8Mg0.2Cl2/SiO2):Eu2+: a violet-blue emitting phosphor with a low UV content for UV-LED based phototherapy illuminators

    Z. Guo, B. Milićević, Z. Zhang, Z. Wu, J. Shi and M. Wu, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ00328B

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