Multi-wavelength excitable europium-doped borosilicate glasses for orange-red emission: composition-induced structure and valence variation

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• 作者：Kun QIU^a ; Hua TIAN^a ; Jun SONG^a ; Zhiyong MAO^b ; Dajian WANG^a ; ^c ; ^d ; ^{djwang@tjut.edu.cn}
• 关键词：borosilicate glasses ; luminescence ; valence state ; europium ion ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2012
• 期刊代码：7_10020721
• 类别：ms
• 出版时间：May, 2012
• 卷：30
• 期：5
• 页码：408-412
• 文件大小：460 K

摘要

Europium-doped borosilicate glasses were prepared by melt-quenching procedure in the air. The mixed valence of Eu²⁺ and Eu³⁺ was identified by photo luminescence spectrum and electron paramagnetic resonance (EPR). The existence of mixed valence was observed owing to the unequivalent substitution and de-polymerization network of the as-prepared borosilicate glasses. The variation of the glass composition in B₂O₃/BaO ratios changed the stability of the Eu³⁺ ions distinctly. In particular, as-prepared borosilicate glasses exhibited a tri-wavelength light excitable spectra centered at 397, 466 and 534 nm to give the broadened orange-red emission at around 592 and 617 nm, due to supersensitive transitions of Eu³⁺ ions. This simultaneous tri-wavelength excitation happened to correspond with the emitting wavelength from near ultraviolet, blue AlInGaN chips and that from YAG:Ce³⁺. The total quantum yield (QY) of the Eu-doped glasses under 466 nm excitation was evaluated to be 10%, potentially providing a versatile combination with the europium-doped borosilicate glasses for red component addition to improve the quality of white light.