CN117285926A - Alpha, alpha-terpyridyl rare earth organic red light conversion agent and preparation method and application thereof - Google Patents

Abstract

The invention relates to the field of organic luminescent material preparation, in particular to an alpha, alpha-terpyridyl rare earth organic red light conversion agent, a preparation method and application thereof. The red light conversion agent consists of a compound Y _(1‑x) Eu _x A ₃ L and K ₇ Mg(BO ₃ ) ₃ Composition of said Y _(1‑x) Eu _x A ₃ The preparation method of L comprises the following steps: s1: by acid treatment of Y ₂ O ₃ And Eu ₂ O ₃ Dissolving; s2: adding alpha, alpha-terpyridine, 2-hydroxy-3-naphthoic acid into absolute ethanolIn (a) and (b); s3: adding ethanol solution containing alpha, alpha-terpyridine and 2-hydroxy-3-naphthoic acid into the solution in the step S1, adjusting the pH to 6-7, and reacting at 60-70 ℃ for 3-5h to obtain Y _(1‑x) Eu _x A ₃ L. The alpha, alpha-terpyridyl rare earth organic red light conversion agent prepared by the invention has obvious yield increasing effect on plants when being applied to the field of agricultural films, and has excellent ageing resistance.

Description

An α,α,α-terpyridyl rare earth organic red light converting agent and its preparation method and application

Technical field

The invention relates to the field of preparation of organic luminescent materials, and specifically relates to an α, α, α-terpyridyl rare earth organic red light converting agent and its preparation method and application.

Background technique

As an excellent light energy conversion material, rare earth organic complexes have become one of the research hotspots in the field of chemistry and materials, arousing great research interest. It has very broad application prospects in the fields of lighting materials, new energy, display materials, biological detection and light-converting agricultural films. Among them, the application reports of rare earth organic complex luminescent materials in light-converting agricultural films have received widespread attention. At present, the main problems with the use of rare earth organic complex luminescent materials as light converting agents in light-converting agricultural films are: the existing red light converting agents have relatively poor spectral absorption capabilities, cannot achieve the expected effect of increasing agricultural plant yields, and are resistant to The aging performance needs to be further improved.

The Chinese invention patent with publication number CN106967100A discloses a rare earth organic light conversion agent Eu (BMPD) _n L and a preparation method of an anti-aging light conversion film. Agricultural films made using this light conversion agent can increase crop yields in practical applications. The effect is not up to expectations.

Contents of the invention

In order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide an α,α,α-terpyridyl rare earth organic red light converting agent and its preparation method and application.

In order to achieve the above objects, the present invention is implemented through the following technical solutions:

An α,α,α-terpyridyl rare earth organic red light converting agent, which is composed of compound Y _(1-x) Eu _x A ₃ L and compound K ₇ Mg (BO ₃ ) ₃ , the compound Y _(1-x) Eu _x A ₃ L has the following structural formula:

;

Among them, 0.1≤x<1, Eu ³⁺ and Y ³⁺ are luminescent centers, L is α, α, α-terpyridine, and A is 2-hydroxy-3-naphthoic acid.

Further, the Y _(1-x) Eu _x A ₃ L is prepared by the following method:

S1: Dissolve Y ₂ O ₃ and Eu ₂ O ₃ with acid;

S2: Add α, α, α-terpyridine and 2-hydroxy-3-naphthoic acid to absolute ethanol in sequence, and stir to dissolve;

S3: Add the absolute ethanol solution containing α, α, α-terpyridine and 2-hydroxy-3-naphthoic acid to the solution in step S1, stir, adjust the pH to 6-7 with sodium hydroxide, and raise the temperature to 60-60 Stir the reaction at 70°C for 3-5 hours, cool to room temperature, filter, wash with absolute ethanol, and dry to obtain Y _(1-x) Eu _x A ₃ L.

In step S1, the acid is one of hydrochloric acid and nitric acid, and the mixing molar ratio of Y ₂ O ₃ and Eu ₂ O ₃ is (1-x):x.

In step S2, the molar ratio of the α, α, α-terpyridine and 2-hydroxy-3-naphthoic acid is 1:3.

Further, the compound K ₇ Mg(BO ₃ ) ₃ is prepared by the following method:

S1: According to the proportion of the general chemical formula, weigh the K ⁺ -containing compounds, Mg ²⁺ -containing compounds, and BO ₃ ^3-- containing compounds as raw materials, then add grinding aids and place them in a ball mill tank;

S2: Place the ball mill tank on the ball mill, add grinding balls for ball milling;

S3: After ball milling, the precursor is obtained through centrifugation and drying;

S4: After grinding the precursor, perform calcination. After calcination, cool and grind.

In step S1, the K ⁺ -containing compound is one of K ₂ CO ₃ , KOH, and K ₂ (COO) ₂ , and the Mg ²⁺ -containing compound is one of Mg (OH) ₂ and Mg (NO ₃ ) ₂ The compound containing BO ₃ ^3- is one of H ₃ BO ₃ and K ₂ B ₄ O ₇ ·10H ₂ O. The grinding aid is one of absolute ethanol, methanol and deionized water. .

In step S2, the diameter of the grinding ball is 1~15 mm, the ball-to-material ratio is (1~4):1, the ball milling time is 60~600min, and the rotation speed is 100~300 rpm.

In step S3, the drying temperature is 80-120°C; in step S4, the calcination temperature is 500-900°C, and the calcination time is 4-12 hours.

Further, the organic red light converting agent is prepared by the following method: compound Y _(1-x) Eu _x A ₃ L, compound K ₇ M (BO ₃ ) ₃ and deionized water according to (3-5): Mix evenly with a mass ratio of 1:5, then grind it with a colloid mill and dry it.

Furthermore, the present invention also provides the application of an α,α,α-terpyridyl rare earth organic red light converting agent in the field of light conversion agricultural film.

Due to the adoption of the above technical solutions, the beneficial effects of the present invention include:

The present invention grinds and mixes compound Y _(1-x) Eu _x A ₃ L and compound K ₇ Mg (BO ₃ ) ₃ through a colloid mill to prepare an α, α, α-terpyridyl rare earth organic red light converter. Light agent; the α,α,α-terpyridyl rare earth organic red light converting agent prepared by the present invention has an obvious yield-increasing effect on plants when used in the agricultural film field, and its weight loss temperature is relatively high through thermal stability testing, and it has Excellent anti-aging properties.

Description of drawings

Figure 1 is the emission spectrum of the α,α,α-terpyridyl rare earth organic red light converting agent prepared in Example 7;

Figure 2 is the excitation spectrum of the α,α,α-terpyridyl rare earth organic red light converting agent prepared in Example 7.

Detailed ways

The present invention will be further described below with reference to embodiments and application examples, but the present invention is not limited to these embodiments.

Example 1

Preparation of compound Y _0.4 Eu _0.6 A ₃ L:

Add 0.1mol Y ₂ O ₃ and 0.15mol Eu ₂ O ₃ to 0.4L 5M hydrochloric acid, stir and dissolve to obtain a hydrochloric acid solution containing rare earth ions; add 0.5mol α,α,α-terpyridine, 1.5mol 2-hydroxy-3 -Add naphthoic acid to 0.5L absolute ethanol in turn, stir and dissolve, then add it to the hydrochloric acid solution containing rare earth ions, adjust pH=7 with 2M sodium hydroxide, raise the temperature to 65°C, stir for 4 hours, and cool to room temperature. Filter, wash with 0.2L absolute ethanol, and dry at 100°C to obtain compound Y _0.4 Eu _0.6 A ₃ L.

Example 2

Preparation of compound Y _0.2 Eu _0.8 A ₃ L:

Add 0.05mol Y ₂ O ₃ and 0.2mol Eu ₂ O ₃ to 0.4L 5M nitric acid, stir and dissolve, and obtain a nitric acid solution containing rare earth ions; add 0.5mol α,α,α-terpyridine, 1.5mol 2-hydroxy- Add 3-naphthoic acid to 0.5L absolute ethanol in sequence, stir and dissolve, then add it to the nitric acid solution containing rare earth ions, stir, adjust pH=7 with 2M sodium hydroxide, raise the temperature to 70°C, stir for 3 hours, and cool. to room temperature, filtered, washed with 0.2L absolute ethanol, and dried at 100°C to obtain compound Y _0.2 Eu _0.8 A ₃ L.

Example 3

Preparation of compound Y _0.8 Eu _0.2 A ₃ L:

Add 0.2mol Y ₂ O ₃ and 0.05mol Eu ₂ O ₃ to 0.4L 5M hydrochloric acid, stir and dissolve to obtain a hydrochloric acid solution containing rare earth ions; add 0.5mol α,α,α-terpyridine, 1.5mol 2-hydroxy-3 - Add naphthoic acid to 0.5L absolute ethanol in turn, stir and dissolve, then add it to the hydrochloric acid solution containing rare earth ions, adjust pH=6 with 2M sodium hydroxide, raise the temperature to 60°C, stir for 5 hours, and cool to room temperature. Filter, wash with 0.2L absolute ethanol, and dry at 100°C to obtain compound Y _0.8 Eu _0.2 A ₃ L.

Example 4

Preparation of compound K ₇ Mg(BO ₃ ) ₃ :

Take 1molMg(OH) ₂ , 3.5molK ₂ CO ₃ , 3molH ₃ BO ₃ , and 0.4L absolute ethanol and place them in a ball milling tank. Place the ball milling tank on the ball mill and add grinding balls for ball milling. The diameter of the grinding balls is 5 mm. , the ball-to-material ratio is 3:1, the ball milling time is 100 min, and the rotation speed is 200 rpm; after the ball milling is completed, centrifuge and dry at 100°C for 3 hours to obtain the precursor; after grinding the precursor, calcined at 800°C for 8 hours, after the calcination is completed After cooling and grinding, compound K ₇ Mg(BO ₃ ) ₃ is obtained.

Example 5

Preparation of compound K ₇ Mg(BO ₃ ) ₃ :

Take 1molMg(NO ₃ ) ₂ , 7molKOH, 3molH ₃ BO ₃ and 0.4L methanol and place them in a ball milling tank. Place the ball milling tank on the ball mill and add grinding balls for ball milling. The diameter of the grinding balls is 2 mm and the ball-to-material ratio is 1:1, the ball milling time is 60min, the rotation speed is 300 rpm; after the ball milling is completed, centrifuge and dry at 80℃ for 3h to obtain the precursor; after grinding the precursor, calcine at 900℃ for 4h, then cool and grind after the calcination is completed, to obtain Compound K ₇ Mg(BO ₃ ) ₃ .

Example 6

Preparation of compound K ₇ Mg(BO ₃ ) ₃ :

Take 1molMg(OH) ₂ , 2.75molK ₂ (COO) ₂ , 0.75molK ₂ B ₄ O ₇ ·10H ₂ O, and 0.4L methanol and place them in a ball milling tank. Place the ball milling tank on the ball mill and add grinding balls for ball milling. The diameter of the grinding ball is 15mm, the ball-to-material ratio is 4:1, the ball milling time is 600min, and the rotation speed is 100 rpm; after the ball milling is completed, centrifuge and dry at 120°C for 2 hours to obtain the precursor; after grinding the precursor, calcine at 500°C 12h, after the calcination is completed, cool and grind to obtain K ₇ Mg(BO ₃ ) ₃ .

Example 7

Mix 2kg of compound Y _0.4 Eu _0.6 A ₃ L (prepared in Example 1), 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4), and 2.5kg of deionized water, and then grind them with a colloid mill, 120 Dry at ℃ for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

Figure 1 is the emission spectrum of the α,α,α-terpyridyl rare earth organic red light converting agent prepared in this example. Its excitation wavelength is 365nm, the main emission position is 606nm to 628nm, and the maximum emission is located at 615nm, which is similar to that of plants. The absorption spectrum of photosynthesis in the red light region matches; Figure 2 is the excitation spectrum of the α,α,α-terpyridyl rare earth organic red light converting agent prepared in this embodiment. Its emission wavelength is 615nm, and its main excitation position is 250nm to 489nm, the maximum excitation is located at 365nm, indicating that the excitation light between 250nm and 489nm can stimulate the light conversion agent to emit light.

Example 8

Mix 1.5kg of compound Y _0.2 Eu _0.8 A ₃ L (prepared in Example 2), 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 5), and 2.5kg of deionized water, and then grind them with a colloid mill. Dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

Example 9

Mix 2.5kg of compound Y _0.8 Eu _0.2 A ₃ L (prepared in Example 3), 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 6) and 2.5kg of deionized water, and then grind them with a colloid mill. Dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

Comparative example 1

Mix 2kg of compound Y _0.4 Eu _0.6 A ₃ L (prepared in Example 1), 0.5kg of compound K ₇ Ba(BO ₃ ) ₃ and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

Comparative example 2

Mix 2.5kg of compound Y _0.4 Eu _0.6 A ₃ L (prepared in Example 1), 0.5kg of compound K ₇ Sr(BO ₃ ) ₃ and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours, that is Obtain α,α,α-terpyridyl rare earth organic red light converting agent.

Comparative example 3

Mix 2.5kg of compound Y _0.4 Eu _0.6 A ₃ L (prepared in Example 1), 0.5kg of compound K ₇ Ca(BO ₃ ) ₃ and 2.5kg of deionized water, then grind with a colloid mill and dry at 120°C for 6 hours, that is Obtain α,α,α-terpyridyl rare earth organic red light converting agent.

Comparative example 4

Mix 2kg of compound YA ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4) and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α, α, α-terpyridyl rare earth organic red light converting agent.

L is α,α,α-terpyridine, and A is 2-hydroxy-3-naphthoic acid.

Comparative example 5

Mix 2kg of compound EuA ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4) and 2.5kg of deionized water, then grind with a colloid mill and dry at 120°C for 6 hours to obtain α,α, α-terpyridyl rare earth organic red light converting agent.

L is α,α,α-terpyridine, and A is 2-hydroxy-3-naphthoic acid.

Comparative example 6

Mix 2kg of compound Y _0.4 Eu _0.6 A ₃ L (prepared in Example 1), 0.5kg of compound Na ₇ Mg(BO ₃ ) ₃ and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

Comparative example 7

Mix 2kg of compound Y _0.4 Eu _0.6 A ₃ L (prepared in Example 1), 0.5kg of compound K ₇ Mg(SiO ₃ ) _4.5 , and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

Comparative example 8

Mix 2kg of compound Y _0.4 Sm _0.6 A ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4), and 2.5kg of deionized water, then grind them with a colloid mill, and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

L is α,α,α-terpyridine, and A is 2-hydroxy-3-naphthoic acid.

Comparative example 9

Mix 2kg of compound Y _0.4 Lu _0.6 A ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4), and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

L is α,α,α-terpyridine, and A is 2-hydroxy-3-naphthoic acid.

Comparative example 10

Mix 2kg of compound Lu _0.4 Eu _0.6 A ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4), and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

L is α,α,α-terpyridine, and A is 2-hydroxy-3-naphthoic acid.

Comparative example 11

Mix 2kg of compound Sm _0.4 Eu _0.6 A ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4) and 2.5kg of deionized water, then grind with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

L is α,α,α-terpyridine, and A is 2-hydroxy-3-naphthoic acid.

Comparative example 12

Mix 2kg of compound Y _0.4 Eu _0.6 A ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4) and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

L is phenanthroline, and A is 2-hydroxy-3-naphthoic acid.

Comparative example 13

Mix 2kg of compound Y _0.4 Eu _0.6 A ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4) and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

L is α, α, α-terpyridine, and A is salicylic acid.

Comparative example 14

Mix 2kg of compound Y _0.4 Eu _0.6 A ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4) and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

L is phenanthroline and A is salicylic acid.

Comparative example 15

Mix 2kg of compound Y _0.4 Eu _0.6 A ₃ L, 0.5kg of compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4) and 2.5kg of deionized water, then grind them with a colloid mill and dry at 120°C for 6 hours to obtain α,α,α-terpyridyl rare earth organic red light converting agent.

L is 2,2′:6′,2″-tripyridine-6-carboxylic acid, and A is 1,3-bis(4-methoxyphenyl)propane-1,3-dione.

Comparative example 16

Mix 2kg compound Y _0.4 Eu _0.6 A ₃ L (prepared in Example 1), 0.5kg compound K ₇ Mg(BO ₃ ) ₃ (prepared in Example 4) and 2.5kg deionized water, and then grind them in a ball mill jar ( Put in the grinding ball according to the ball-to-material ratio of 4:1, the ball milling speed is 240 rpm) for 5 hours, and dry at 120°C for 6 hours to obtain α, α, α-terpyridyl rare earth organic red light converting agent.

Comparative example 17

The organic light conversion agent Eu(BMPD)nL was prepared in Example 1 of the Chinese invention patent with publication number CN106967100A.

Application examples

Preparation of light conversion agricultural film:

30Kg red light converting agent prepared in Examples 7-9 and Comparative Examples 1-17, 15Kg low density polyethylene (951-000), 50Kg linear low density polyethylene (7042), 5Kg vinyl bisstearamide (EBS-SF) is added to the high-speed mixer and stirred with the high-speed mixer, where the stirring speed is 1200r/min and the stirring time is 2h. After stirring evenly, it is extruded through a twin-screw extruder at 160°C and a rotating speed of 300r/min. Extrusion from the machine, air-cooling granulation, and preparation of optical conversion masterbatch;

Mix 300Kg of low-density polyethylene (951-000), 400Kg of linear low-density polyethylene (7042), and 12Kg of optical transfer masterbatch, and then blow the film with a film blowing machine to produce an agricultural film with a film thickness of 90 microns. Among them, the melting temperature of the film blowing machine is 180°C, and the die temperature is 160°C.

Lettuce was grown in open greenhouses (not covered with agricultural film), agricultural film greenhouses without adding light converting agents, and agricultural film greenhouses adding different light converting agents. The specifications of each greenhouse were 5 meters long, 5 meters wide, and high. 3 meters, select lettuce and plant it in the greenhouse. When harvesting, 3 areas are randomly selected in each greenhouse, and 10 samples are selected from each area.

The yield increase of lettuce covered with agricultural films with different light converting agents is shown in Table 1:

Table 1

greenhouse Number of plants Total weight/g Open greenhouse 30 4328.15 Agricultural film greenhouse without adding light conversion agent 30 4935.12 Example 7 30 6047.10 Example 8 30 5979.32 Example 9 30 5938.79 Comparative example 1 30 5809.73 Comparative example 2 30 5818.96 Comparative example 3 30 5794.37 Comparative example 4 30 5614.38 Comparative example 5 30 5710.61 Comparative example 6 30 5900.14 Comparative example 7 30 5789.26 Comparative example 8 30 5514.72 Comparative example 9 30 5418.26 Comparative example 10 30 5610.74 Comparative example 11 30 5674.10 Comparative example 12 30 5573.18 Comparative example 13 30 5689.75 Comparative example 14 30 5548.79 Comparative example 15 30 5718.67 Comparative example 16 30 5876.54 Comparative example 17 30 5798.05

Examples 7-9 of the present application are red light converting agents prepared from compound Y _(1-x) Eu _x A ₃ L and compound K ₇ Mg (BO ₃ ) _3. As can be seen from Table 1, using this conversion Agricultural films prepared with light agents have a higher yield-increasing effect when used to grow lettuce; agricultural films prepared using other types of red light converting agents also have a yield-increasing effect when used to grow lettuce, but the yield-increasing effect is not as good as that produced by this application. The effect of light converting agent.

A thermogravimetric analyzer was used to test the thermal stability of the light conversion agricultural film prepared in the application example in an air atmosphere. The temperature test range was 50-600°C, and the heating rate was 10°C/min. The test results are shown in Table 2, where Td5% It is the temperature at which weight loss is 5%, and Tdmax% represents the temperature at which weight loss is maximum.

Table 2

light transfer agricultural film Td5%/℃ Tdmax%/℃ Example 7 350 425 Example 8 351 426 Example 9 348 422 Comparative example 1 345 420 Comparative example 2 346 419 Comparative example 3 340 409 Comparative example 4 339 408 Comparative example 5 341 410 Comparative example 6 345 419 Comparative example 7 346 421 Comparative example 8 340 410 Comparative example 9 342 414 Comparative example 10 343 414 Comparative example 11 343 416 Comparative example 12 342 415 Comparative example 13 340 412 Comparative example 14 341 413 Comparative example 15 345 419 Comparative example 16 348 422 Comparative example 17 343 413

Examples 7-9 are red light converting agents prepared from compound Y _(1-x) Eu _x A ₃ L and compound K ₇ Mg (BO ₃ ) _3. The Td5% of agricultural films prepared using this light converting agent are respectively are 350°C, 351°C, and 348°C, and the Tdmax% are 425°C, 426°C, and 422°C respectively. From the data in Table 2, it can be seen that the agricultural film prepared by using the light converting agent of the present application has a Td5% temperature, Tdmax % temperature are higher than those of agricultural films prepared with other types of light conversion agents.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention; however, those of ordinary skill in the art may make some modifications using the technical content disclosed above without departing from the scope of the technical solution of the present invention. Alterations, modifications, and evolutions that are equivalent to the above embodiments are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essential technology of the present invention are still equivalent to within the protection scope of the technical solution of the present invention.

Claims (9)

1. An alpha, alpha-terpyridyl rare earth organic red light conversion agent is characterized in that the red light conversion agent consists of a compound Y _(1-x) Eu _x A ₃ L and Compound K ₇ Mg(BO ₃ ) ₃ The composition of the composite material comprises the components,

the compound Y _(1-x) Eu _x A ₃ L has the following structural formula:

；

wherein x is more than or equal to 0.1 and less than 1, eu ³⁺ 、Y ³⁺ Is a luminescence center, L is alpha, alpha-terpyridine, A is 2-hydroxy-3-naphthoic acid.

2. The α, α, α -terpyridyl rare earth organic red light converter of claim 1, wherein Y _(1-x) Eu _x A ₃ L is prepared by the following method:

s1: by acid treatment of Y ₂ O ₃ And Eu ₂ O ₃ Dissolving;

s2: sequentially adding alpha, alpha-terpyridine and 2-hydroxy-3-naphthoic acid into absolute ethyl alcohol, stirring and dissolving;

s3: adding absolute ethanol solution containing alpha, alpha-terpyridine and 2-hydroxy-3-naphthoic acid into the solution in the step S1, stirring, adjusting pH to be 6-7 with sodium hydroxide, heating to 60-70 ℃, stirring for reaction for 3-5h, cooling to room temperature, filtering, washing with absolute ethanol, and drying to obtain Y _(1-x) Eu _x A ₃ L。

3. The α, α, α -terpyridyl rare earth organic red light conversion agent according to claim 2, wherein in step S1The acid is one of hydrochloric acid and nitric acid, and the Y ₂ O ₃ With Eu ₂ O ₃ The mixing molar ratio is (1-x): x.

4. The α, α, α -terpyridyl rare earth organic red light converter according to claim 2, wherein in step S2, the mixing molar ratio of α, α, α -terpyridyl to 2-hydroxy-3-naphthoic acid is 1:3.

5. The alpha, alpha-terpyridyl rare earth organic red light converting agent according to claim 1, characterized in that said compound K ₇ Mg(BO ₃ ) ₃ Prepared by the following method:

s1: weighing the raw materials according to the proportion of the chemical general formula, wherein the raw materials contain K ⁺ Compound (iv) containing Mg ²⁺ Compounds of (A) and BO-containing ₃ ^3- Adding grinding aid into the mixture, and placing the mixture in a ball milling tank;

s2: placing the ball milling tank on a ball mill, and adding grinding balls for ball milling;

s3: after ball milling, centrifuging and drying to obtain a precursor;

s4: grinding the precursor, calcining, cooling and grinding after the calcining is finished to obtain the catalyst;

wherein in step S1, the K-containing material ⁺ The compound of (C) is K ₂ CO ₃ 、KOH、K ₂ (COO) ₂ One of them contains Mg ²⁺ The compound of (2) is Mg (OH) ₂ 、Mg(NO ₃ ) ₂ One of them contains BO ₃ ^3- The compound of (2) is H ₃ BO ₃ 、K ₂ B ₄ O ₇ ·10H ₂ And one of O, wherein the grinding aid is one of absolute ethyl alcohol, methanol and deionized water.

6. The alpha, alpha-terpyridyl rare earth organic red light conversion agent according to claim 5, wherein in the step S2, the diameter of the grinding ball is 1-15 mm, the ball-material ratio is (1-4): 1, the ball milling time is 60-600 min, and the rotating speed is 100-300 r/min.

7. The α, α, α -terpyridyl rare earth organic red light converter of claim 5, wherein in step S3, the drying temperature is 80-120 ℃; in the step S4, the calcination temperature is 500-900 ℃ and the calcination time is 4-12 h.

8. The α, α, α -terpyridyl rare earth organic red light converting agent according to claim 1, wherein the organic red light converting agent is prepared by:

to compound Y _(1-x) Eu _x A ₃ L, compound K ₇ Mg(BO ₃ ) ₃ And (3) uniformly mixing deionized water according to the mass ratio of (3-5) to 1:5, grinding by a colloid mill, and drying to obtain the product.

9. Use of an α, α, α -terpyridyl rare earth organic red light conversion agent according to any one of claims 1-8 in the field of light conversion agricultural films.