首页|Sensitized Up-Conversion Luminescence of Ho~(3+) in Nd~(3+) -Yb~(3+) -Ho~(3+) Co-doped ZrF_4- Based Glass
Sensitized Up-Conversion Luminescence of Ho~(3+) in Nd~(3+) -Yb~(3+) -Ho~(3+) Co-doped ZrF_4- Based Glass
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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 assisted by Nd~(3+) → Yb~(3+) → Ho~(3+) energy transfer. The strong green emission due to the Ho~(3+) : (~5F_4, ~5S_2) → ~5I_8 transitions was observed in Nd~(3+) - Ho~(3+) co-doped ZrF_4-based fluoride glasses under 800 nm excitation. As an attempt to enhance Ho~(3+) up-conversion luminescences in the Nd~(3+) - Ho~(3+) co-doped ZrF_4-based glasses, Yb~(3+) ions were added to the glasses. As a result it was found that, in 800 nm excitation of 60ZrF_4. 30BaF2. (8-x)LaF_3. 1NdF_3. xYbF_3. 1HoF_3 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 Ho~(3+) : ~5F_3 → ~5I_8, ( ~5F_4, ~5S_2) → ~5I_8 and ~5F_5 → ~5I_8 transitions respectively. The intensities of the green and red emissions in a 3 mol% YbF_3-containing glass were about 50 times stronger than those glasses without YbF_3. This is based on sensitization due to Yb~(3+) ions. In particular, the green emission was extremely strong and the Nd~(3+) - Yb~(3+) - Ho~(3+) co-doped ZrF_4-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.
heavy metal fluoride glassluminescenceup-conversion
Shaukat S. F.、DONG Ya-Ming、Hussain M.、Farooq R.、LI Guang-Yuan
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Department of Physics, East China University of Science and Technology, Shanghai 200237, China
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