中国物理B ›› 2004, Vol. 13 ›› Issue (1): 115-124.doi: 10.1088/1009-1963/13/1/022

• • 上一篇    

Comprehensive research about the cooperative up-conversion luminescence of the ytterbium-doped oxyfluoride vitroceramics

陈晓波1, 宋增福2   

  1. (1)Applied Optics Beijing Area Major Laboratory, Analytic and Testing Centre, Beijing Normal University, Beijing 100875, China; (2)School of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2003-02-12 修回日期:2003-07-04 出版日期:2004-01-22 发布日期:2007-03-22
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10174008).

Comprehensive research about the cooperative up-conversion luminescence of the ytterbium-doped oxyfluoride vitroceramics

Chen Xiao-Bo (陈晓波)a, Song Zeng-Fu (宋增福)b   

  1. a Applied Optics Beijing Area Major Laboratory, Analytic and Testing Centre, Beijing Normal University, Beijing 100875, China; b School of Physics, Peking University, Beijing 100871, China
  • Received:2003-02-12 Revised:2003-07-04 Online:2004-01-22 Published:2007-03-22
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10174008).

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摘要： The cooperative up-conversion blue luminescence of Yb^{3+} ion-doped oxyfluoride vitroceramic material (Yb:FOV) and the influence of co-doped Ho^{3+} ion, when excited by a 960 nm diode-laser, are studied in this paper. A strong blue 479.1 nm up-conversion luminescence of the Yb:FOV material is discovered. It is found that the 479.1 nm luminescence results from the cooperative up-conversion of the coupled states of the Yb^{3+}－Yb^{3+} clusters formed by two adjacent Yb^{3+} ions. The measured cooperative up-conversion luminescence main peak 479.1 nm of this paper is different from the characteristic fluorescence main peak of the Tb^{3+} ion positioned at about 495－504 nm wave-range. Our result coincides with all the published correct papers, whose cooperative up-conversion luminescence main peaks of the direct Yb^{3+}－Yb^{3+} clusters are all positioned at about 476－480 nm wave-range. All of these indicate that the large cooperative up-conversion blue luminescence of the direct Yb^{3+}－Yb^{3+} clusters discovered in this paper is stable. It further proves that the cooperative up-conversion green luminescence may result from the Yb^{3+}-Tb^{3+} cooperative effect. In particular, the original work of this paper improves considerably on the traditional concept by the experimental facts that the blue 479.1 nm cooperative up-conversion luminescence strength of Yb(5):FOV is 230 times greater than that of fluoride glass Yb(3):ZBLAN. This is a great development to meet the practical requirements for blue up-conversion luminescence strength. This result indicates that the large cooperative up-conversion blue luminescence could be achieved excellently by using a suitable material, such as oxyfluoride vitroceramic, which provides a better chance to form better Yb^{3+}－Yb^{3+} clusters and has less relaxation to keep the more efficient up-conversion luminescence. It is also found that impurities seriously reduce the cooperative up-conversion luminescence intensity due to the cross-relaxation from the Yb^{3+}－Yb^{3+} clusters, which means that the cooperative up-conversion blue luminescence could be further improved by pure Yb^{3+} ion-doped materials that have as few impurities as possible to reduce the cross-relaxation. The large cooperative up-conversion blue luminescence of Yb(5):FOV also comes from its higher concentration (5 mol%) of activator Yb^{3+} ion which acts well because the cooperative up-conversion blue luminescence intensity varies linearly against the square of the concentration of Yb^{3+} ions in the range of 0.5－5 mol%. In summary, the great improvement of our work on cooperative up-conversion blue luminescence results from the comprehensive enhancement of the factors of better-coupled chance of the Yb^{3+}－Yb^{3+} clusters, less cross-relaxation, better concentration contribution of Yb^{3+} activator, non-saturation, and better up-conversion luminescence efficiency.

Abstract: The cooperative up-conversion blue luminescence of Yb$^{3+}$ ion-doped oxyfluoride vitroceramic material (Yb:FOV) and the influence of co-doped Ho$^{3+}$ ion, when excited by a 960 nm diode-laser, are studied in this paper. A strong blue 479.1 nm up-conversion luminescence of the Yb:FOV material is discovered. It is found that the 479.1 nm luminescence results from the cooperative up-conversion of the coupled states of the Yb$^{3+}$－Yb$^{3+}$ clusters formed by two adjacent Yb$^{3+}$ ions. The measured cooperative up-conversion luminescence main peak 479.1 nm of this paper is different from the characteristic fluorescence main peak of the Tb$^{3+}$ ion positioned at about 495－504 nm wave-range. Our result coincides with all the published correct papers, whose cooperative up-conversion luminescence main peaks of the direct Yb$^{3+}$－Yb$^{3+}$ clusters are all positioned at about 476－480 nm wave-range. All of these indicate that the large cooperative up-conversion blue luminescence of the direct Yb$^{3+}$－Yb$^{3+}$ clusters discovered in this paper is stable. It further proves that the cooperative up-conversion green luminescence may result from the Yb$^{3+}$-Tb$^{3+}$ cooperative effect. In particular, the original work of this paper improves considerably on the traditional concept by the experimental facts that the blue 479.1 nm cooperative up-conversion luminescence strength of Yb(5):FOV is 230 times greater than that of fluoride glass Yb(3):ZBLAN. This is a great development to meet the practical requirements for blue up-conversion luminescence strength. This result indicates that the large cooperative up-conversion blue luminescence could be achieved excellently by using a suitable material, such as oxyfluoride vitroceramic, which provides a better chance to form better Yb$^{3+}$－Yb$^{3+}$ clusters and has less relaxation to keep the more efficient up-conversion luminescence. It is also found that impurities seriously reduce the cooperative up-conversion luminescence intensity due to the cross-relaxation from the Yb$^{3+}$－Yb$^{3+}$ clusters, which means that the cooperative up-conversion blue luminescence could be further improved by pure Yb$^{3+}$ ion-doped materials that have as few impurities as possible to reduce the cross-relaxation. The large cooperative up-conversion blue luminescence of Yb(5):FOV also comes from its higher concentration (5 mol%) of activator Yb$^{3+}$ ion which acts well because the cooperative up-conversion blue luminescence intensity varies linearly against the square of the concentration of Yb$^{3+}$ ions in the range of 0.5－5 mol%. In summary, the great improvement of our work on cooperative up-conversion blue luminescence results from the comprehensive enhancement of the factors of better-coupled chance of the Yb$^{3+}$－Yb$^{3+}$ clusters, less cross-relaxation, better concentration contribution of Yb$^{3+}$ activator, non-saturation, and better up-conversion luminescence efficiency.

Key words: up-conversion, cooperative, Yb$^{3+}$－Yb$^{3+}$ cluster, blue light

中图分类号:  (Semiconductor lasers; laser diodes)

  • 42.55.Px
42.70.Nq (Other nonlinear optical materials; photorefractive and semiconductor materials) 78.40.-q (Absorption and reflection spectra: visible and ultraviolet) 81.05.Pj (Glass-based composites, vitroceramics) 78.55.-m (Photoluminescence, properties and materials)