| Ultraviolet Light Induced White Emission of Eu3+
and Dy3+ Co-Doped Oxyfluoride Glass-Ceramics
Containing LaF3 Nanocrystals |
Shaojun Cheng, Yanyan Bu, Xiangfu Wang and Xiaohong Yan*
Pages : 16-21
DOI : 10.1080/0371750X.2014.980851 |
| Abstract |
| Dy3+ single doped and Dy3+-Eu3+ co-doped transparent glass-ceramics (GC) containing hexagonal LaF3 nanocrystals
were fabricated by melt-quenching method and subsequent heating. XRD, TEM, absorption and emission spectra
were used to investigate the structural and luminescent properties of resulting GC. Excited by 390 nm, the
Dy3+-Eu3+ co-doped GC exhibited bright white emission with CIE coordinates 0.345, 0.333. Judd-Ofelt intensity
parameters, radiative probability, luminescence branching ratio, cross-sections and effective bandwidth were
calculated. The Judd-Ofelt parameters (?2, ?4 and ?6) have indicated that GC has a high asymmetrical and covalent
feature. The resulting GC may be used in the white light emitting diode fields.
[Keywords: Dy3+, Eu3+, Glass-ceramics, Luminescence, Judd-Ofelt parameters] |
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