Upconversion color tunability and white light generation in Yb3+/Er3+/Tm3+ tri-doped CaF2 single crystals
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2019 ◽
Vol 275
◽
pp. 63-69
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2019 ◽
Vol 7
(12)
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pp. 1801793
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2019 ◽
Vol 525
◽
pp. 119679
◽
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