Rare earth ion doped strontium silicate fluorescent powder and preparation method thereof

A rare earth ion and phosphor technology, applied in chemical instruments and methods, luminescent materials, photovoltaic power generation, etc., can solve the problems of weak absorption and limited practical application, and achieve the effects of convenient operation, improved energy utilization efficiency, and simple synthesis process

Pending Publication Date: 2022-05-24
中化学南方建设投资有限公司 +1
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  • Application Information

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Problems solved by technology

But based on these trivalent rare earth ions RE 3+ (RE=Tb, Tm, Pr) is a parity-forbidden 4f-4f transition, resulting in narrow-band absorption and very weak absorption, which limits the practical application of this type of material in solar cells

Method used

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  • Rare earth ion doped strontium silicate fluorescent powder and preparation method thereof
  • Rare earth ion doped strontium silicate fluorescent powder and preparation method thereof
  • Rare earth ion doped strontium silicate fluorescent powder and preparation method thereof

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preparation example Construction

[0029] The preparation method of the rare earth ion-doped strontium silicate fluorescent powder of the present invention is synthesized by a solid-phase method, and comprises the following steps:

[0030] Step 1) According to the general chemical formula Sr 2-z Ce 0.04 Tb 0.06 Yb z SiO 4 The stoichiometric ratio of each element was weighed to take the corresponding SrCO 3 (A.R.), SiO 2 (A.R.), CeO 2 (99.99%), Tb 4 O 7 (99.99%), Yb 2 O 3 (99.99%), and a small amount of flux;

[0031] Step 2) Place the powder obtained by weighing in step 1) into a container, add an appropriate amount of alcohol to fully grind and mix, and then place it in a high-temperature crucible;

[0032] The above-mentioned container may be an agate mortar, and the high temperature crucible may be a high temperature alumina crucible.

[0033]Step 3) Bury the cover of the high-temperature alumina crucible into the carbon powder environment, place it in a high-temperature furnace and set a program...

Embodiment 1

[0041] The chemical composition formula of this embodiment is Sr 1.87 Ce 0.04 Tb 0.06 Yb 0.03 SiO 4 The specific preparation method of the down-conversion phosphor is as follows:

[0042] According to the chemical composition formula Sr 1.87 Ce 0.04 Tb 0.06 Yb 0.03 SiO 4 , according to the stoichiometric ratio, respectively weigh SrCO 3 (A.R.), SiO 2 (A.R.), CeO 2 (99.99%), Tb 4 O 7 (99.99%), Yb 2 O 3 (99.99%), add 1wt% of H 3 BO 3 Put it in an agate mortar and add an appropriate amount of anhydrous ethanol to grind for 30 minutes. After it is dry, scrape off the powder attached to the mortar wall, dry grind for 30 minutes, and then place it in a high-temperature alumina crucible ①, put the crucible ① Buried in a high-temperature alumina crucible ② containing carbon powder, placed in a box furnace, heated to 1100 °C at a heating rate of 5 °C / min, kept for 3 hours, cooled to room temperature with the furnace, and the sample was re-ground into powder , and fina...

Embodiment 2 to Embodiment 5

[0047] The required raw materials were weighed according to the chemical composition formula and stoichiometric ratio in Table 1. The preparation method was the same as that in Example 1. The chemical composition, sintering temperature, sintering time, emission spectrum, Tb 3+ Fluorescence lifetime parameters are listed in Table 1.

[0048] Table 1

[0049]

[0050] The phosphors prepared in Examples 1-5 of the present invention, Ce 3+ , Tb 3+ and Yb 3+ The main emission peak varies with Yb 3+ The relative intensity change diagram of the content change is as follows Figure 5 shown. Depend on Figure 5 It can be seen that when Ce 3+ and Tb 3+ When the concentration is constant, with the Yb 3+ The position of each emission peak is basically unchanged, but the intensity changes obviously. Ce 3+ and Tb 3+ The intensity of the emission peak gradually decreases, but Yb 3+ The intensity of the emission peak (977 nm) of the ionic transition gradually increases. When ...

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Abstract

The invention relates to rare earth ion doped strontium silicate fluorescent powder and a preparation method thereof, the general formula of the fluorescent powder is Sr < 2-z > Ce < 0.04 > Tb < 0.06 > Yb < z > SiO4, and z is more than or equal to 0.01 and less than or equal to 0.05. The preparation method comprises the following steps: adding a small amount of H3BO3 into SrCO3, SiO2, CeO2, Tb4O7 and Yb2O3 to serve as a fluxing agent, fully grinding and uniformly mixing, placing in a reducing atmosphere, and preparing by a high-temperature solid phase method. The prepared fluorescent powder is stable in physicochemical property, the preparation method is simple, industrial production is easy, and the fluorescent powder has excellent down-conversion luminescence performance and has good application potential in the aspect of improving the efficiency of a silicon solar cell.

Description

technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a rare earth ion doped strontium silicate fluorescent powder and a preparation method thereof, belonging to the innovative technology of the rare earth ion doped strontium silicate fluorescent powder and the preparation method thereof. Background technique [0002] In recent years, energy problems have become a key factor restricting social development. As a clean and renewable energy, solar energy has attracted much attention in its development and utilization. Among them, silicon solar cells are the most mature and widely used, but their solar energy utilization efficiency There is still a lot of room for improvement. One of the main reasons limiting the efficiency of silicon solar cells is the mismatch between the sunlight spectrum and the spectral response (at about 1000 nm) of silicon solar cells. The down-conversion of UV-visible light to near-infrar...

Claims

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Application Information

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IPC IPC(8): C09K11/59
CPCC09K11/77742Y02E10/52
Inventor 王珍韩立辉房中陈曦陈龙黄开雄沈宏全
Owner 中化学南方建设投资有限公司
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