Ytterbium Erbium Doped Lead Tungstate Upconversion Materials

In recent years, more and more studies have been carried out on the properties of Er-doped materials, including infrared-visible up-conversion, optical and electrical properties of Er, as well as the progress and development of laser diodes, which have attracted unprecedented attention to Er-doping and luminescence.

Therefore, in order to solve the problem of low luminous intensity of the erbium-doped lead tungstate crystal upconversion material prepared by the prior art, the researchers tried to convert the ytterbium (Yb) and yttrium (Er) elements on the lead tungstate crystal. Yb and Er double doped lead tungstate crystal upconversion materials are made of WO₃, PbO, Er₂O₃ and Yb₂O₃; wherein the molar ratio of WO₃ and PbO is 1:1, the doping concentration of Er₂O₃ is 0.1-3 mol%, and the doping of Yb₂O₃ The impurity concentration is 0.1 to 3 mol%.

The method for preparing the bismuth double doped lead tungstate crystal upconversion material is achieved by the following steps: 1. Weigh WO₃, PbO, Er₂O₃ and Yb₂O₃, wherein the molar ratio of WO₃ to PbO is 1:1, and the doping concentration of Er₂O₃ is 0.1 to 3 mol%, the doping concentration of Yb₂O₃ is 0.1 to 3 mol%; 2. The weighed WO₃, PbO, Er₂O₃ and Yb₂O₃ are uniformly mixed, placed in a platinum crucible, and then sintered in an environment of 1000 to 1100 °C for 3h, cooling to room temperature; Third, the crystal is grown by pulling: crystallizing, necking, shoulder, shoulder, equal diameter growth, pull-off and annealing, so that Yb and Er double doped lead tungstate Crystal upconversion material; wherein in step 3, the crystallizing program: heating the sintered polycrystalline material to melt, and maintaining the melting temperature for 30 min, then slowly lowering the temperature until the seed crystal does not melt in the melt and stops cooling, the seed The crystal continues to grow at this temperature.

It is found that the doping element ytterbium (Yb) in the ytterbium-doped lead tungstate crystal conversion material has a Yb energy level gap of about 104 cm-1 and a wide coverage. It can be excited by 980 nm LD, and its introduction can be transmitted by energy. The large enhancement of the co-doped rare earth ion up-conversion luminescence, on the basis of retaining the original excellent performance of the Er-doped lead tungstate crystal, improves the luminescence intensity of the Er-doped lead tungstate crystal by nearly three times. It is a laser material with excellent performance.

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