【摘 要】
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Up-conversion processes for the blue, green and red emissions were found two-photon phenomenon, known as the cooperative phenomenon. This phenomenon was assiste
【机 构】
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Department of Physics, East China University of Science and Technology, Shanghai 200237, ChinaDepart
论文部分内容阅读
Up-conversion processes for the blue, green and red emissions were found two-photon phenomenon, known as the cooperative phenomenon. This phenomenon was assisted by Nd3+ →Yb3+ → Ho3+ energy transfer. The strong green emission due to the Ho3+ : (5F4 , 5S2) → 5I8 transitions was observed in Nd3+ - Ho3+ co-doped ZrF4-based fluoride glasses under 800 nm excitation. As an attempt to enhance Ho3+ up-conversion luminescences in the Nd3+ - Ho3+ co-doped ZrF4-based glasses, Yb3+ ions were added to the glasses. As a result it was found that, in 800 nm excitation of 60ZrF4. 30BaF2. (8-x)LaF3. 1NdF3. xYbF3. 1HoF3 glasses (x=0 to 7), sensitized up-conversion luminescences are observed at around 490 nm (blue), 545 nm (green), and 650 nm (red), which correspond to the Ho3+ : 5F3 → 5I8 , ( 5F4 , 5S2) →5I8 and 5F5 → 5I8 transitions respectively. The intensities of the green and red emissions in a 3 mol % YbF3 -containing glass were about 50 times stronger than those glasses without YbF3. This is based on sensitization due to Yb3+ ions. In particular, the green emission was extremely strong and the Nd3+-Yb3+ -Ho3+co-doped ZrF4-based glasses have a high possibility of realizing a green up-conversion laser glass. In this paper the up-conversion mechanism in the glasses is discussed in detail.
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