UPCONVERSION FLUORESCENCE DYNAMICS OF Tm3+ IONS IN LiYF4 CRYSTAL
Chen Xue-yuan (陈学元)a, Luo Zun-du (罗遵度)ab
a Fujian Institute of Research on the Structure of Matter, Academia Sinica, Fuzhou 350002, China; b China Centre of Advance Science and Technology (CCAST) (World Laboratory), P. O. Box 8730, Beijing 100080, China
Abstract According to Judd-Ofelt parameter calculation and energy transfer theory, the cross-relaxation process of the Tm3+ ions is investigated. A four-level system of coupled rate equations is established to study the fluorescence dynamics of Tm3+ in LiYF4 crystal. Attentions are focused on the upconversion luminescence 1G4→3H6 (483.0 nm) in Tm3+:LiYF4. The relationship between the avalanche properties (critical pump rate, fluorescence intensity and buildup time) originated by resonant excited state absorption and the doped Tm3+ concentration is discussed, and some useful conclusions are drawn.
Received: 25 February 1998
Revised: 07 April 1998
Accepted manuscript online:
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