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A near-infrared upconversion long afterglow luminescent material and preparation method thereof

A long afterglow luminescence, near-infrared technology, applied in the field of micro-nano materials, can solve the problems of high preparation cost, complex preparation process, harsh preparation conditions, etc.

Active Publication Date: 2020-10-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is complicated, the preparation conditions are relatively harsh, and the preparation cost is relatively high.

Method used

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  • A near-infrared upconversion long afterglow luminescent material and preparation method thereof
  • A near-infrared upconversion long afterglow luminescent material and preparation method thereof
  • A near-infrared upconversion long afterglow luminescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1) A certain stoichiometric ratio of ZnO, Ga 2 o 3 , SnO 2 , Cr 2 o 3 , Yb 2 o 3 and Er 2 o 3 The powder is thoroughly ground and mixed in an agate mortar.

[0049] 2) The ground powder is pre-fired at 900° C. for 2 hours in an air atmosphere and atmospheric pressure in a muffle furnace. The block was sintered at 1300°C for 15 hours in an air atmosphere and one atmospheric pressure.

[0050] 3) The sintered product is cooled to room temperature, and ground again in a mortar to obtain the near-infrared up-conversion long-lasting luminescent material Zn 3 Ga 2 SnO 8 : 1%Cr 3+ , 5%Yb 3+ , 0.5% Er 3+ .

[0051] Use a scanning electron microscope (SEM, TDCLS-4800, Toshiba, Japan) to observe that the luminescent particles are micro-nano structures, such as figure 1 As shown, the luminescent particles with micro-nano structure are more convenient to be applied in more fields. XRD spectrum (D / MAX-2500, 10-60°, Rigaku Corporation) analyzes the characteristic pea...

Embodiment 2

[0054] Using the same method as in Example 1, the raw material powder was pre-fired in a muffle furnace at 900° C. for 2 hours. The pre-fired samples were ground again in a mortar and then sintered at 1600 °C for 3 h.

[0055] Observation with a scanning electron microscope to observe that the luminescent particles are micro-nano structures, such as Figure 5 As shown, the particle diameter is larger than that of the material prepared in Example 1, because the increase of the sintering temperature and the extension of the holding time make the grain growth more complete and the structure more compact. Test afterglow performance under the same conditions, the excitation afterglow intensity of this particle is stronger than embodiment 1, especially in the initial stage, as Figure 6 .

Embodiment 3

[0057] Using the same method as in Example 1, the raw material powder was pre-fired in a muffle furnace at 900° C. for 2 hours. After the pre-fired samples were ground again in a mortar, a certain amount of samples were pressed into discs with a diameter of about 15 mm and a thickness of about 1 mm by using a powder tablet press.

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Abstract

The invention discloses a near infrared up-conversion long afterglow luminescent material and a preparation method thereof. The preparation method comprises the following steps: (1) weighing raw materials, and evenly mixing raw material powder, wherein the raw materials comprises a raw material A, a raw material B, a raw material C, and a raw material D, the raw material A is chromium oxides or corresponding salts, the raw material B is oxides of erbium or thulium or corresponding salts, the raw material C is ytterbium oxides or corresponding salts, and the raw material D is oxides of zinc, gallium / aluminum, or germanium / tin or corresponding salts; and (2) pressing and moulding mixed powder obtained in the step (1) to obtain a blank sample; (3) solid-phase sintering the blank sample obtained in the step (2) at a high temperature; and (4) cooling the sintering product to obtain the target material. A high temperature solid phase method is adopted, the prepared material, which is doped by Cr<3+> and Er<3+> / Tm<3+> and takes Yb<3+> as the sensitizing agent, has a near infrared excited up-conversion luminescence function and a super long time afterglow performance and can be used as a high performance functional material applied to related fields.

Description

technical field [0001] The invention belongs to the field of micro-nano materials, and specifically relates to a near-infrared up-conversion long-lasting luminescent material and a preparation method thereof. The prepared near-infrared long-lasting luminescent material can be used in high-tech fields such as electronics and biomedical imaging. Background technique [0002] The near-infrared up-conversion long-lasting luminescent material can produce a high-energy long-lasting photoluminescent material after being excited by low-energy near-infrared light. It has a series of specific advantages such as high chemical stability, low toxicity, not easy to photolysis and photobleaching, making it invaluable in lighting, information storage, high-energy ray detection, safety emergency instructions, traffic, safety and equipment marking, etc. Broad application prospects. In particular, the material has high biological tissue penetration ability, low background noise, and low biolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66
CPCC09K11/7769
Inventor 孙康宁葛平慧李爱民成圆王荣
Owner SHANDONG UNIV
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