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《CHINESE JOURNAL OF LUMINESCENCE》 2000-01
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Optical Transitions and the Upconversion from IR to Visible of Yb~(3+) and Er~(3+) Co-doped Fluoroborate Glass

CHEN Bao jiu, WANG Hai yu, QIN Wei ping, XU Wu, HUANG Shi hua (Laboratory of Excited State Processes, Chinese Academy of Sciences, Changchun 130021, China)(Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changc  
Fluoroborate glasses have been the subject of several spectroscopic investigations due to their potential as laser host matrix. In recent letters infrared conversion to visible and ultraviolet by Yb 3+ -Er 3+ and Yb 3+ -Ho 3+ ions in some glasses host has been reported. In this paper, the aim is to find suitable host for upconversion luminescence, and a fluoroborate glass co doped with Yb 3+ and Er 3+ was designed. The optical transition properties and upconversion under 970nm LD excitation were discussed for this glass sample. The fluoroborate glass with component 30H 3BO 3 15AlF 3 19.5PbF 2 10BaF 2 10ZnF 2 10NaF 5Yb 2O 3 0.5Er 2O 3 was prepared. The absorption spectrum was measured in visible range from 350nm to 700nm. The J O theory was used to calculate the optical properties of Er 3+ and Yb 3+ codoped in fluoroborate glass. The J O parameters were obtained, Ω =1.2E 20(cm 2), Ω =3.6E 20(cm 2), Ω =7.7E 21(cm 2). The transition probabilities, the oscillator strengths, branching ratios and the radioactive lifetimes were obtained. The red ( 4F 9/2 → 4I 15/2 ) and green ( 2H 11/2 , 4S 3/2 → 4I 15/2 ) upconversion luminescence under 970nm LD excitation was observed, the upconversion mechanism was discussed. In this system the upconversion luminescence by energy transfer from Yb 3+ to Er 3+ and from Er 3+ to Er 3+ and excited state absorption of Er 3+ was proposed. The relationship between LD working current and intensity of upconversion luminescence was discussed. The results confirmed that the upconversion process is consisted by two photons.
【Fund】： “8 63”计划!( 863 -715 -0 0 3 -0 0 10 );; “973”国家重点基础研究规划-稀土功能材料的基础研究资助项目!( G19980 613 13 G19980
【CateGory Index】： O482.31
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