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Study on the Growth and Upconversion Luminescence Property of Zn:Er:LiNbO3 Crystals

Author: WangJia
Tutor: WangRui
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: LiNbO3 crystals erbium doping defect structure upconversion optical damage resistance
CLC: O734
Type: Master's thesis
Year: 2008
Downloads: 12
Quote: 0
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Abstract


Zn(3、6 and 7mol%):Er(1.5 and 3mol%):LiNbO3 single crystals with no macroscopic defects but high optical quality were grown by the Czochralski method. The optimum process conditions for growing Zn:Er:LiNbO3 single crystals were determined. The UV-Visable absorption spectra、the infrared transmission spectra、the green light upconversion emission specrea、the upconversion time-resolved spectra、the upconversion emission mechanism and the optical damage resistance ability were tested.The conclusion about defect structure and the location of Zn 2+ and Er 3+ ions could be obtained form the measured results by the UV-Visable absorption spectra and the infrared transmission spectra., then the threshold concentration of Zn2+ in the crystal has been confirmed. The results showed that the threshold concentration of Zn2+ in the crystal is 6mol%. When the doping concentration is below it, the Zn2+ ions enter the crystal by substituting the anti-site Nb defect, while when the concentration is above it, the Zn2+ ions enter the crystal by substituting the Li and Nb ions in the normal lattice site and formed the Zn Li +-Zn Nb 3 defect group. But the Er3+ ions enter the crystal by substituting the Li and Nb ions in the normal lattice site and formed the the cluster Er3+ ions defect centra (Er Li 2+ -Er Nb2-).The influence of the green light upconversion properties on the different doping concentration of Zn2+ and Er 3+ ions was investigated. The result showed that with the increase doping concentration of Zn2+ and Er 3+ ions, the luminescence intensity of Zn:Er:LiNbO3 crystals were increased. The result of the green upconversion time-resolved spectra showed that when the concentration reached the threshold, the mechanism of green light upconversion changed from the double photon process to the photon avalanche progress.The optical damage resistance ability were tested, the influence of the doping concentration of Zn2+ ions were investigated. The result showed that the increasing concentration of Zn2+ ions enhanced the optical damage resistance ability of the crystals. When the doping concentration of Zn2+ ions reached the threshold, the optical damage resistance ability of the crystal increased obviously, this is good for the green light upconversion luminescence.The investigation results above show that the Zn(7mol%):Er(3mol%):LiNbO3 has the most excellent upconversion luminescence properties in this series.

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CLC: > Mathematical sciences and chemical > Crystallography > Crystal physics > The optical properties of the crystal
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