Luminescence of Ce3+ in lanthanum silicon oxynitride

doi:10.1088/1674-1056/19/12/127807

中国物理B ›› 2010, Vol. 19 ›› Issue (12): 127807-127807.doi: 10.1088/1674-1056/19/12/127807

Luminescence of Ce³⁺ in lanthanum silicon oxynitride

胡龙, 徐学文, 卢遵铭, 范英, 李养贤, 唐成春

School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China

收稿日期:2010-09-20 修回日期:2010-09-23 出版日期:2010-12-15 发布日期:2010-12-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10974041) and the Natural Science Foundation of Hebei Province of China (Grant No. E2010000084).

Luminescence of Ce³⁺ in lanthanum silicon oxynitride

Hu Long(胡龙),Xu Xue-Wen(徐学文),Lu Zun-Ming(卢遵铭),Fan Ying(范英), Li Yang-Xian(李养贤), and Tang Cheng-Chun(唐成春)^†

School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China

Received:2010-09-20 Revised:2010-09-23 Online:2010-12-15 Published:2010-12-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10974041) and the Natural Science Foundation of Hebei Province of China (Grant No. E2010000084).

摘要/Abstract

摘要： The luminescence properties of lanthanum silicon oxynitride (La-Si-O-N) series doped by trivalent Ce ions have been investigated to seek for tunable wavelength-conversion phosphor for white light emitting diode applications. Four compound hosts of LaSiO₂N, La₄Si₂O₇N₂, La₅Si₃O₁₂N, and La₂Si₆O₃N₈ were synthesized and examined in this work. Crystallographic examination for the equal amount of Ce³⁺ substitution indicated that the covalency degree decreased in a sequence LaSiO₂N > La₂Si₆O₃N₈ > La₄Si₂O₇N₂ > La₅Si₃O₁₂N, not simply in correlation to the ratio of N³/O². Excitation and emission spectrum measurements showed the main features of Ce³⁺ luminescence in the series: the centre of gravity of 5d bands depends on crystal-field splitting more strongly than that on covalency of Ce–N bonding; nephelauxetic effect could not be observed clearly for the investigated series; to some extent Stokes shift was dominated by crystal-field splitting rather than Ce–N covalency degree.

Abstract: The luminescence properties of lanthanum silicon oxynitride (La-Si-O-N) series doped by trivalent Ce ions have been investigated to seek for tunable wavelength-conversion phosphor for white light emitting diode applications. Four compound hosts of LaSiO₂N, La₄Si₂O₇N₂, La₅Si₃O₁₂N, and La₂Si₆O₃N₈ were synthesized and examined in this work. Crystallographic examination for the equal amount of Ce³⁺ substitution indicated that the covalency degree decreased in a sequence LaSiO₂N > La₂Si₆O₃N₈ > La₄Si₂O₇N₂ > La₅Si₃O₁₂N, not simply in correlation to the ratio of N³/O². Excitation and emission spectrum measurements showed the main features of Ce³⁺ luminescence in the series: the centre of gravity of 5d bands depends on crystal-field splitting more strongly than that on covalency of Ce–N bonding; nephelauxetic effect could not be observed clearly for the investigated series; to some extent Stokes shift was dominated by crystal-field splitting rather than Ce–N covalency degree.

Key words: photoluminescence, nitrides, oxides, chemical synthesis

中图分类号: (Impurities in crystals)

61.72.S-

71.70.Ch (Crystal and ligand fields) 78.55.Hx (Other solid inorganic materials) 81.05.-t (Specific materials: fabrication, treatment, testing, and analysis)

胡龙, 徐学文, 卢遵铭, 范英, 李养贤, 唐成春. Luminescence of Ce³⁺ in lanthanum silicon oxynitride[J]. 中国物理B, 2010, 19(12): 127807-127807.

Hu Long(胡龙),Xu Xue-Wen(徐学文),Lu Zun-Ming(卢遵铭),Fan Ying(范英), Li Yang-Xian(李养贤), and Tang Cheng-Chun(唐成春). Luminescence of Ce³⁺ in lanthanum silicon oxynitride[J]. Chin. Phys. B, 2010, 19(12): 127807-127807.

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Luminescence of Ce³⁺ in lanthanum silicon oxynitride

Luminescence of Ce³⁺ in lanthanum silicon oxynitride

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