VUV Luminescent Properties of Rare Earth Fluorides and Borates

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YOU Fang-Tian, YANG Zhi, LU Pei-Chao, WANG Ying-Xia, LIN Jian-Hua and TAO Ye. VUV Luminescent Properties of Rare Earth Fluorides and Borates[J]. Chinese Physics C, 2001, 25(S1): 70-74.
YOU Fang-Tian, YANG Zhi, LU Pei-Chao, WANG Ying-Xia, LIN Jian-Hua and TAO Ye. VUV Luminescent Properties of Rare Earth Fluorides and Borates[J]. Chinese Physics C, 2001, 25(S1): 70-74. shu
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Received: 1900-01-01
Revised: 1900-01-01
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VUV Luminescent Properties of Rare Earth Fluorides and Borates

    Corresponding author: YOU Fang-Tian,
  • State Key Laboratory of Rare Earth Materials Chemistry and Applications,College of Chemistry and Molecular Engineering,Peking University,Beijing 100039,China2 Institute of High Energy Physics,CAS,Beijing 100871,China

Abstract: The quantum cutting effect was observed in Eu3+ doped hexagonal NaGdF4.Upon VUV excitation to the 6GJ level of Gd3+,two red photons are emitted by Eu3+ through an efficient two-step energy transfer process.The quantum efficiency of this material is about 160%.Cubic NaGdF4 contains considerable amount of oxygen impurity,so that the 4f-5d transition moves to lower energy(177nm),which fits the energy of the VUV photons from discharge of inert gas; the color purity of the emission of cubic NaGdF4 is also improved by oxygen doping.The photon cascade emission of Gd3+ ions was observed in GdBaB9O16.Under the 202 nm excitation,a red and a near infrared radiative transition from 6GJ states,6GJ6IJ and 6GJ6PJ occur followed by an ultraviolet emission of 6PJ8S7/2.

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