Terbium Doped Zinc Tungstate Long Afterglow Nanomaterials

Long afterglow materials refer to materials that can absorb and store energy irradiated by external light, and then release these energy slowly in the form of visible light at room temperature. Long afterglow material is a new type of functional material which meets the development requirements of the 21st century. It has the characteristics of high efficiency, energy saving, green and environmental protection. Its application range has also expanded from lighting, decoration to communication, display and storage.

Tungstate is an important matrix for upconversion luminescent materials, such as zinc tungstate. Scholars have reported that ZnWO₄ single crystal is made into upconversion luminescent laser materials. In order to further study the up-conversion optical properties of zinc tungstate, some scholars recently doped terbium into zinc tungstate to prepare terbium-doped zinc tungstate long afterglow nanomaterials.

1)Substrate treatment: The glass sheets were immersed in a mixture of 3mol/L H₂SO₄ and 9mol/LH₂O₂ for 2 hours. The treated glass sheets were then subjected to ultrasonic treatment in acetone and anhydrous ethanol for 15 minutes, with the frequency of ultrasonic oscillation ranging from 20 to 50kHz, then washed with distilled water and dried naturally.

2)Preparation of ZnO seed film: 0.5g zinc acetate was dissolved in 100ml absolute ethanol, stirred to produce uniform and transparent solution for drawing film. The glass sheet was dipped in the solution for 10 minutes by dipping and drawing method, then pulled out at a uniform speed of 1 cm/min. After drying in the drying chamber at 60 ℃ for one hour, the film was repeatedly coated three times, and the glass sheet was baked in the muffle oven at 450 ℃ for one hour. ZnO seed film was obtained.

3)Preparation of Terbium-doped zinc tungstate nanorod arrays growth solution: massage erbi zinc nitrate:terbium nitrate=1:0.1, dissolved in distilled water to produce 0.002 mol/L nitrate solution, total amount of masserbi zinc nitrate and terbium nitrate:sodium tungstate=1:1. Sodium tungstate was introduced into nitrate solution and magnetic stirred for 1 hour at 200 r/min speed to form suspension, then zinc nitrate:6 times. The molar ratio of methyltetramine to methyltetramine is 1:1. The surfactant hexamethylenetetramine is introduced. The magnetic stirring speed is 200 r/min for 1 hour, and the pH value is adjusted to 2 with 3.0 mol/L nitric acid solution. The precipitation in the suspension is dissolved to form a transparent growth liquid.

4)Growth of terbium-doped zinc tungstate nanorod arrays: glass sheets containing zinc oxide seed film were placed flat in the growth solution, and the water bath temperature of the growth solution was controlled to be 60 ℃. After 24 hours of growth, glass sheets were taken out and washed with distilled water. After drying at 80 ℃ in the drying chamber for 48 hours, terbium-doped zinc tungstate nanomaterials with luminescent properties were obtained.

Terbium is one of the lanthanide elements and belongs to rare earth metals. It has been widely used in agriculture, industry, animal husbandry, medicine and health, high-tech industries and other fields. The addition of terbium has greatly enhanced the ability of zinc tungstate to absorb and store external light irradiation, and the long afterglow luminescence performance has been improved rapidly.

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