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Open Access CaScAlSiO6:Eu2+: A novel near-ultraviolet converting blue-emitting phosphor for white light-emitting diodes

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A high intense blue-emitting phosphor CaScAlSiO6:Eu2+ (CSAS:Eu2+) peaking at 430–460 nm was synthesized by solid state reactions. The luminescence properties of CSAS:Eu2+ phosphors as well as thermal quenching and the fabrication of white-light-emitting diodes (W-LEDs) were firstly investigated. The optimal doping concentration of Eu2+ is 2 mol% and the critical distance for energy transfer is determined to be 19.49 Å. By utilizing a mixture of blue-emitting CSAS:Eu2+, green-emitting SrSi2O2N2:Eu2+ and red-emitting CaAlSiN3:Eu2+ phosphors as light converters, an intense white GaN-based n-UV-LED (370 nm) was fabricated to exhibit good color-rendering index R a of as high as 87.98 at correlated color temperature of 5537 K and CIE coordinates of (0.33, 0.42). Based on the results, we are currently evaluating the potential application of CSAS:Eu2+ as a blue-emitting near-UV convertible phosphor.

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Keywords: CASCALSIO6; LIGHT-EMITTING DIODES; LUMINESCENCE; PHOSPHORS

Document Type: Short Communication

Publication date: June 1, 2015

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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