A blue photoresist color paste based on fluorene-based structure dye and its synthesis method

Abstract

This invention discloses a dye for blue photoresist color paste based on a fluorene group and its synthesis method. The dye is a fluorene-containing dye A, which is prepared by the following steps: (1) using an amine compound as a nucleophile, it undergoes an aromatic nucleophilic substitution reaction with a halo-9-fluorene ketone B to obtain a diamino-9-fluorene ketone intermediate C; (2) the intermediate C is dehydrated and condensed with an arylamine D to form a triarylmethane-like skeleton, finally obtaining the target novel fluorene-containing dye A. The fluorene-containing dye of this invention has excellent color performance and is suitable for mixed-system or dye-based blue photoresist color pastes. It can significantly improve the brightness, transparency, contrast, and dispersibility of the color paste, while possessing high hiding power, strong tinting strength, and good thermal and light stability. In addition, the synthesis method is simple and suitable for industrial production.

Description

Technical Field

[0001] This invention relates to the field of color photoresist technology, specifically to a novel fluorene-containing dye for blue photoresist color paste and its synthesis method. Background Technology

[0002] In the flat panel display manufacturing industry, the performance of the color filter (CF) in TFT-LCD (Thin Film Transistor Liquid Crystal Display) directly affects the color performance of the display. Currently, the industry mainly uses pigment nano-dispersion photoresist systems. Although these systems possess good weather resistance and initial color saturation, the low solubility of pigment molecules leads to the formation of large aggregates in the photoresist, resulting in severe backlight scattering. This significantly reduces the contrast of the color filter and increases energy consumption. This deficiency makes it difficult to meet the stringent requirements of next-generation display technologies for wide color gamut and low power consumption.

[0003] To achieve precise spectral control, color filters rely on the selective absorption characteristics of colorant molecules (380~780nm visible light band). Triarylmethane dyes are considered ideal candidate materials due to their wide spectral range (yellow-blue-red), high molar extinction coefficient, excellent fluorescence properties, and structural tunability. However, current technologies still lack solutions for blue triarylmethane dyes that combine high stability, ease of synthesis, and excellent dispersibility. Summary of the Invention

[0004] This invention effectively overcomes the aforementioned technical barriers through innovative molecular design and simplified processes. For example, combining the two common phenyl groups in triarylmethane into a fluorenyl structure greatly improves its photothermal stability, and its good solubility results in excellent dispersibility, thus improving contrast and brightness.

[0005] The technical problem to be solved by this invention is to overcome the technical defects of the prior art and further improve the stability of dye colorant molecules for photoresists. This invention provides a novel fluorene-containing dye for blue photoresist color paste and its synthesis method. The novel fluorene-containing dye molecule provided by this invention enhances the planarity of the molecule by combining two phenyl groups commonly found in triarylmethane into a fluorene group. This facilitates the formation of a conjugated system between multiple aryl groups and the dispersion of electrons activated by light or heat, thereby greatly improving the lightfastness and heat resistance of the molecule.

[0006] These dye molecules can be mixed with other colorants to form mixed or dye-based blue photoresist pastes, which can be used to improve various properties of the paste, such as brightness, contrast and weather resistance.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0008] A novel fluorene-containing dye for blue photoresist color paste has the following chemical structural formula:

[0009]

[0010] The symbols in the formula represent the following meanings:

[0011] R 1 -R 4 Each can be used independently to represent an alkyl substituent or an aryl substituent;

[0012] Ar represents a substituted or unsubstituted aromatic group; the aromatic group includes hydrocarbon aryl and heterocyclic aryl groups.

[0013] Preferably, R 1 -R 4 The group is an alkyl substituent or an aryl substituent with 1 to 20 carbon atoms; wherein the hydrogen atom contained in the alkyl substituent or aryl substituent may be replaced by a halogen atom, the -CH- contained in the alkyl substituent may be replaced by -CO- or -O-, and the aryl substituent Ar is a common aromatic, aromatic fused ring or aromatic heterocyclic ring.

[0014] The method for synthesizing a novel fluorene-containing dye for blue photoresist pigments, as described above, includes the following steps:

[0015] (1) Weigh out dihalo9-fluorenone B and dissolve it in a solvent. Add palladium catalyst, ligand and base, and react with amines under an inert atmosphere to obtain diamino9-fluorenone intermediate C;

[0016] (2) The diamino-9-fluorenone intermediate C is dehydrated and condensed with arylamine to form a triarylmethane-like skeleton, and finally the target blue photoresist color paste novel fluorenyl dye A is obtained;

[0017] The above synthetic route is as follows:

[0018]

[0019] The symbols in the formula represent the following meanings:

[0020] R 1 -R 4 Each can be used independently to represent an alkyl substituent or an aryl substituent;

[0021] X represents a halogen atom, including chlorine, bromine, and iodine;

[0022] Ar represents various substituted or unsubstituted aromatic groups, including aromatic hydrocarbon groups containing a carbide ring and heterocyclic aromatic groups. Aromatic hydrocarbons, excluding benzene rings, can include: biphenyl, terphenyl, naphthalene, anthracene, etc.; heterocyclic aromatic groups can include: furan, thiophene, pyrrole, pyrimidine, pyrazine, quinoline, etc., which are five-membered, six-membered, or condensed polycyclic heterocyclic rings.

[0023] As a preferred technical solution, Ar is naphthalene. More preferably, Ar is naphthalene, and the fluorene group and -N are respectively connected to the naphthalene in the para position.

[0024] Preferably, R 1 -R 4 The group is an alkyl substituent or an aryl substituent with 1 to 20 carbon atoms; wherein the hydrogen atom contained in the alkyl substituent or aryl substituent may be replaced by a halogen atom, the -CH- contained in the alkyl substituent may be replaced by -CO- or -O-, and the aryl substituent Ar is a common aromatic, aromatic fused ring or aromatic heterocyclic ring.

[0025] Preferably, R 1 -R 4 The groups are independently selected from alkyl substituents having 1 to 10 carbon atoms.

[0026] More preferably, R 1 -R 4 The groups are independently selected from alkyl substituents having 1 to 4 carbon atoms.

[0027] Preferably, in step (1), the halogen in the dihalo-9-fluorenone is chlorine, bromine or iodine.

[0028] Preferably, in step (1), the amine is a secondary amine substituted with two alkyl or aryl groups, or an aliphatic or aromatic cyclic structure containing an NH group.

[0029] Preferably, in step (1), the amine includes, but is not limited to, one or more selected from tetrahydropyrrole, piperidine, morpholine, indole, and purine.

[0030] Preferably, in step (1), the palladium catalyst includes, but is not limited to, one or more selected from palladium acetate, tetratriphenylphosphine palladium, 1,1'-bis(diphenylphosphine)ferrocene palladium dichloride, and bis(dibenzylideneacetone) palladium.

[0031] Preferably, in step (1), the ligand includes, but is not limited to, one or more selected from Xphos, Ruphos, Sphos, and Xantphos.

[0032] Preferably, in step (1), the alkali includes, but is not limited to, one or more selected from potassium tert-butoxide, sodium tert-butoxide, and cesium carbonate.

[0033] Preferably, in step (1), the solvent used in the aromatic nucleophilic substitution reaction includes, but is not limited to, one or more selected from toluene, xylene, tetrahydrofuran, and 1,4-dioxane.

[0034] Preferably, in step (1), the molar ratio of dihalo9-fluorenone B to amine raw material in the palladium-catalyzed coupling reaction is 1:1 to 1:3, more preferably 1:1.5 to 1:2.

[0035] Preferably, in step (1), the molar ratio of dihalo9-fluorenone B to palladium catalyst in the palladium-catalyzed coupling reaction is 1:0.006~1:0.1, more preferably 1:0.05~1:0.1.

[0036] Preferably, in step (1), the molar ratio of the dihalo-9-fluorenone molecule B to the ligand in the palladium-catalyzed coupling reaction is 1:0.1 to 1:0.5, more preferably 1:0.1 to 1:0.2.

[0037] Preferably, in step (1), the molar ratio of dihalo9-fluorenone molecule B to the base in the palladium-catalyzed coupling reaction is 1:2 to 1:5, more preferably 1:2 to 1:3.

[0038] Preferably, in step (1), the reaction temperature in the palladium-catalyzed coupling reaction is 20℃~150℃, more preferably 95℃~100℃.

[0039] Preferably, in step (2), the molar ratio of the arylamine to the 9-fluorenone intermediate is 1:1 to 5:1, more preferably 1:1 to 1.5:1.

[0040] Preferably, in step (2), the dehydration reagent used in the dehydration condensation reaction includes, but is not limited to, phosphorus oxychloride, phosphorus pentachloride, phosphorus pentoxide, etc., and more preferably phosphorus oxychloride.

[0041] Preferably, in step (2), the temperature of the dehydration condensation reaction is 60℃~150℃, more preferably 60℃~80℃.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] (1) The novel fluorene-containing dye molecules provided by this invention have higher thermal stability, light stability, excellent solubility, and good dispersibility;

[0044] (2) The novel fluorene-containing dye molecule provided by the present invention can be mixed with other colorants to prepare mixed or dye-type photoresist pastes, and has good compatibility;

[0045] (3) The synthesis method provided by the present invention has a simple route, a wide range of reagent sources, and is easy to scale up. Attached Figure Description

[0046] Figure 1 The compound C1 prepared in Example 1 of this invention 1 H-NMR spectrum;

[0047] Figure 2 The compound A1 prepared in Example 1 of this invention 1 H-NMR spectrum;

[0048] Figure 3 The compound A2 prepared in Example 2 of this invention 1 H-NMR spectrum

[0049] Figure 4 The compound A3 prepared in Example 3 of this invention 1 H-NMR spectrum;

[0050] Figure 5 The UV-vis absorption spectrum of compound A1 prepared in Example 1 of this invention in PGMEA;

[0051] Figure 6 This is a thermogravimetric diagram of compound A1 prepared in Example 1 of the present invention. Detailed Implementation

[0052] To better understand the content of this invention, further description is provided below with reference to specific embodiments and accompanying drawings. It should be understood that these embodiments are only for further illustration of the invention and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the description of this invention, those skilled in the art may make some non-essential modifications or adjustments to the invention, which still fall within the protection scope of this invention.

[0053] Example 1 (Synthesis of compound A1);

[0054] A method for synthesizing a novel fluorene-containing dye for blue photoresist pigment paste, comprising the following steps:

[0055] (1) Take a dry and clean 250 mL three-necked flask and place a stir bar of appropriate size; add 2,7-dibromo-9-fluorenone (3.38 g, 10 mmol, 1.0 eq.), N-ethylaniline (3.03 g, 25 mmol, 2.5 eq.), potassium tert-butoxide (3.37 g, 30 mmol, 3.0 eq.), Xphos (95 mg, 0.2 mmol, 0.02 eq.), palladium acetate (23 mg, 0.1 mmol, 0.01 eq.), and toluene (180 mL), replace with nitrogen for protection, and heat under reflux overnight for 16 h. Spot the sample onto a TLC plate. The reactants were completely reacted. Allow to cool naturally to room temperature (20~25℃), filter, and collect the filtrate and evaporate to dryness. Column chromatography of the residue yielded the target product C12.7 g, with a yield of 64.5%.

[0056] The chemical structural formula of intermediate C1 is as follows:

[0057] unit

[0058] 1H NMR (400 MHz, DMSO-d6) δ 7.69 (dd, J = 7.3, 0.5 Hz, 1H), 7.37 (d,J = 2.1 Hz, 1H), 7.30 – 7.21 (m, 2H), 7.14 – 7.02 (m, 4H), 3.78 (q, J = 7.4Hz, 2H), 1.28 (t, J = 7.5 Hz, 3H).

[0059] The compound A1 1 The H-NMR spectrum is shown below. Figure 1 .

[0060] (2) Take a dry and clean 50 mL three-necked flask and place a stir bar of appropriate size; add intermediate C1 (2.7 g, 6.5 mmol, 1.0 eq.), N-ethyl-1-naphthylamine (2.4 g, 14.2 mmol, 2.2 eq.), and dry chlorobenzene solvent (10 mL) obtained in the previous step; then, under ice-water bath conditions, add phosphorus oxychloride (2.2 g, 14.2 mmol, 2.2 eq.) dropwise to the above solvent; after the phosphorus oxychloride is added, raise the above reaction system to 45~50℃ and react for 24 hours; after the reaction is completed, add 100 mL of chloroform and 100 mL of water to dissolve and separate the chloroform layer, dry it with anhydrous sodium sulfate and then evaporate it to dryness, and the residue is precipitated by column chromatography to obtain the target product A1 3.1 g, with a yield of 83.8%;

[0061] The chemical structural formula of compound A1 is as follows:

[0062]

[0063] 1H NMR (400 MHz, DMSO-d6) δ 8.12 – 8.06 (m, 1H), 8.02 – 7.94 (m, 1H), 7.55 – 7.46 (m, 4H), 7.42 (d, J = 8.3 Hz, 2H), 7.32 – 7.24 (m, 4H), 7.19 – 7.10 (m, 7H), 7.10 – 7.01 (m, 2H), 6.91 – 6.85 (m, 1H), 5.49 – 5.43 (m, 1H), 3.89 (q, J = 7.5 Hz, 4H), 3.38 (q, J = 6.1 Hz, 2H), 1.34 – 1.24 (m, 9H).

[0064] The compound A1 1 The H-NMR spectrum is shown below. Figure 2 The UV-vis absorption spectrum of compound A1 in PGMEA is shown in [reference needed]. Figure 5 The thermogravimetric diagram of compound A1 is shown below. Figure 6 .

[0065] Example 2 (Synthesis of compound A2)

[0066] A method for synthesizing a novel fluorene-containing dye for blue photoresist pigment paste, comprising the following steps:

[0067] (1) Take a dry and clean 50 mL three-necked flask and place a stir bar of appropriate size; add intermediate C1 (2.7 g, 6.5 mmol, 1.0 eq.), N,N-dimethyl-1-naphthylamine (2.4 g, 14.2 mmol, 2.2 eq.) and dry chlorobenzene solvent (10 mL); then add phosphorus oxychloride (2.2 g, 14.2 mmol, 2.2 eq.) dropwise to the above solvent under ice-water bath conditions; after the phosphorus oxychloride is added, raise the above reaction system to 45~50℃ and react for 24 hours; after the reaction is completed, add 100 mL of chloroform and 100 mL of water to dissolve and separate the chloroform layer, dry it with anhydrous sodium sulfate and then evaporate it to dryness, and the residue is obtained by column chromatography to obtain the target product A2 3.3 g, with a yield of 89.2%;

[0068] The chemical structural formula of compound A2 is as follows:

[0069]

[0070] 1H NMR (400 MHz, DMSO-d6) δ 8.22 – 8.13 (m, 1H), 8.13 – 8.05 (m, 1H), 7.56 – 7.47 (m, 4H), 7.42 (dd, J = 8.3, 0.6 Hz, 2H), 7.35 – 7.22 (m, 5H), 7.18 – 6.99 (m, 9H), 5.49 – 5.42 (m, 1H), 3.89 (q, J = 7.5 Hz, 4H), 2.85 (s, 6H), 1.27 (t, J = 7.5 Hz, 6H).

[0071] The compound A2 1 The H-NMR spectrum is shown below. Figure 3 .

[0072] Example 3 (Synthesis of compound A3)

[0073] A method for synthesizing a novel fluorene-containing dye for blue photoresist pigment paste, comprising the following steps:

[0074] (1) In the above synthesis example 1, diethylamine was used instead of N-ethylaniline. Otherwise, the intermediate C2 1.9 g was obtained in the same manner as in synthesis example 1, with a yield of 58.9%;

[0075] The chemical structural formula of compound C2 is as follows:

[0076]

[0077] (2) In the above synthesis example 1, C2 was used instead of C1, and otherwise, compound A31.9 g was obtained in the same manner as in synthesis example 1, with a yield of 58.9%;

[0078] The chemical structural formula of compound A3 is as follows:

[0079]

[0080] 1H NMR (400 MHz, DMSO-d6) δ 8.15 – 8.06 (m, 1H), 8.03 – 7.93 (m, 1H), 7.60 – 7.46 (m, 2H), 7.43 – 7.36 (m, 2H), 7.21 – 7.15 (m, 3H), 6.90 – 6.87(m, 1H), 6.77 – 6.72 (m, 2H), 5.51 – 5.40 (m, 1H), 3.47 (q, J = 7.0 Hz, 8H), 3.38 (q, J = 6.1 Hz, 2H), 1.31 (t, J = 6.1 Hz, 3H), 1.15 (t, J = 7.0 Hz, 12H).

[0081] The compound A1 1 The H-NMR spectrum is shown below. Figure 4 .

[0082] Comparative Example 1

[0083] Commercially available dye Basic Blue 7 was used as Comparative Example 1.

[0084] The chemical structural formula of Basic Blue 7 is as follows:

[0085]

[0086] Effect Experiment Example

[0087] I. Determination of UV-Vis Absorption Spectroscopy for Fluorenyl Dye Molecules

[0088] The fluorene-containing dye molecules prepared in Examples 1-3 and the dye described in Comparative Example 1 were formulated into 10 μmol / L solutions using propylene glycol methyl ether acetate (PGMEA) as the solvent. The absorption spectra were measured using a UV-Vis spectrophotometer. The molar extinction coefficient of the dye was calculated using the following formula:

[0089] Α = εcl

[0090] In the formula, A is the absorbance intensity; ε is the molar extinction coefficient, with units of L / (mol·cm); c is the concentration, with units of mol / L; and l is the thickness of the absorption layer, with units of cm.

[0091] The UV-Vis absorption spectra of the fluorene-containing dye molecules prepared in Examples 1-3 and the dye described in Comparative Example 1 are shown in Table 1.

[0092] Table 1. UV-Vis absorption spectra of fluorene-containing dye molecules prepared in Examples 1-3 and the dye described in Comparative Example 1.

[0093]

[0094] As shown in Table 1, the fluorene-containing dye molecules prepared in Example 3 showed a slight red shift compared to Comparative Example 1. The fluorene-containing dye molecules prepared in Examples 1 and 2 showed a further slight red shift compared to Example 1. Moreover, the fluorene-containing dye molecules prepared in Example 1 had the highest molar absorptivity.

[0095] II. Solubility Test of Dye Molecules

[0096] The solubility of the fluorene-containing dye molecules prepared in Examples 1-3 and the dye described in Comparative Example 1 in PGMEA and N,N-dimethylformamide (DMF) was tested. A certain amount of dye and organic solvent were weighed, sonicated at room temperature for 10 min, and allowed to stand for 24 h. The mixture was then filtered three times using a filter membrane. The filtrate was dried, and the solubility S of the dye was calculated.

[0097] S = 100M S / M L

[0098] In the formula, M S This refers to the mass of the dye after drying, in grams (g); in milliliters (M). L This is the mass of the solution, in grams (g).

[0099] The solubility test results of the fluorene-containing dye molecules prepared in Examples 1-3 and the dye molecules described in Comparative Example 1 are shown in Table 2.

[0100] Table 2. Solubility test results of fluorene-containing dye molecules prepared in Examples 1-3 and the dye molecules described in Comparative Example 1.

[0101]

[0102] As shown in Table 2, the fluorene-containing dye molecules prepared in Examples 1-3 all have good solubility in PGMEA and DMF, among which the fluorene-containing dye molecule prepared in Example 3 has the best solubility in PGMEA and DMF.

[0103] III. Thermal stability test of dye molecules

[0104] The fabrication of color filters involves a post-baking process at 200℃ or higher, as industrial applications require dye molecules to exhibit good thermal stability at this temperature. Thermogravimetric analysis (TGA) is used to evaluate the thermal stability of synthetic dyes. Under nitrogen protection, the synthetic dyes are heated from room temperature to 500℃ at a rate of 10℃ / min to determine their thermal decomposition temperature T. d .

[0105] The thermal stability test results of the fluorene-containing dye molecules prepared in Examples 1-3 and the dye molecule described in Comparative Example 1 are shown in Table 3.

[0106] Table 3. Thermal stability test results of fluorene-containing dye molecules prepared in Examples 1-3 and the dye molecule described in Comparative Example 1.

[0107]

[0108] As shown in Table 3, the T-type dyes containing fluorene groups prepared in Examples 1-3... d Within the temperature range of 448~478℃, the weight loss rate at 230℃ is less than 5%, indicating that the thermal stability of the above dye molecules is significantly improved compared with the original triarylmethane dyes.

[0109] This invention designs an innovative class of fluorene-containing dye compounds, which are particularly suitable for formulating high-performance blue photoresist color pastes. This dye not only significantly improves the brightness of the color paste but also possesses the following excellent properties: outstanding optical performance, excellent dispersibility, and superior color strength. Furthermore, the compound exhibits remarkable thermal stability. In terms of the preparation process, the procedures developed in this invention are simple and efficient, making them highly suitable for large-scale industrial production.

[0110] The foregoing description is not intended to limit the invention, nor is the invention limited to the examples given. Any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the invention should also be considered within the protection scope of the invention.

Claims

1. A novel fluorene-containing dye for blue photoresist pigments, characterized in that, The chemical structural formula of the fluorene-containing dye is as follows: ； The symbols in the formula represent the following meanings: R 1 -R 4 Each can be used independently to represent an alkyl substituent or an aryl substituent; Ar represents a substituted or unsubstituted aromatic group.

2. The method for synthesizing a novel fluorene-containing dye for blue photoresist pigment as described in claim 1, characterized in that, Includes the following steps: (1) Weigh out dihalo9-fluorenone B and dissolve it in a solvent. Add palladium catalyst, ligand and base, and react with amines under an inert atmosphere to obtain diamino9-fluorenone intermediate C; (2) The diamino-9-fluorenone intermediate C is dehydrated and condensed with arylamine to form a triarylmethane-like skeleton, and finally the target novel fluorenyl-containing dye A is obtained; The above synthetic route is as follows: ； The symbols in the formula represent the following meanings: R 1 -R 4 Each can be used independently to represent an alkyl substituent or an aryl substituent; X represents a halogen atom; Ar represents a substituted or unsubstituted aromatic group; the aromatic group includes hydrocarbon aryl and heterocyclic aryl groups.

3. The method for synthesizing a novel fluorene-containing dye for blue photoresist pigment as described in claim 2, characterized in that, In step (1), the halogen in the dihalo-9-fluorenone is chlorine, bromine or iodine; In step (1), the amine is a secondary amine substituted with two alkyl or aryl groups, or an aliphatic or aromatic cyclic structure containing an NH group.

4. The method for synthesizing a novel fluorene-containing dye for blue photoresist pigment as described in claim 1, characterized in that, In step (1), the amines include, but are not limited to, one or more selected from tetrahydropyrrole, piperidine, morpholine, indole, and purine.

5. The method for synthesizing a novel fluorene-containing dye for blue photoresist pigment as described in claim 2, characterized in that, In step (1), the palladium catalyst includes, but is not limited to, one or more selected from palladium acetate, tetratriphenylphosphine palladium, 1,1'-bis(diphenylphosphine)ferrocene palladium dichloride, and bis(dibenzylideneacetone) palladium.

6. The method for synthesizing a novel fluorene-containing dye for blue photoresist pigment as described in claim 2, characterized in that, In step (1), the ligand includes, but is not limited to, one or more selected from Xphos, Ruphos, Sphos, and Xantphos; In step (1), the alkali includes, but is not limited to, one or more selected from potassium tert-butoxide, sodium tert-butoxide, and cesium carbonate.

7. The method for synthesizing a novel fluorene-containing dye for blue photoresist pigment as described in claim 2, characterized in that, In step (1), the molar ratio of the dihalogenated 9-fluorenone molecule B to the amine raw material is 1:1 to 1:3; In step (1), the molar ratio of the dihalo-9-fluorenone molecule B to the palladium catalyst is 1:0.006~1:0.1; In step (1), the molar ratio of the dihalo-9-fluorenone molecule B to the ligand is 1:0.1 to 1:0.5; In step (1), the molar ratio of the dihalo-9-fluorenone molecule B to the base is 1:2 to 1:5; In step (1), the reaction temperature is 20℃~150℃.

8. The method for synthesizing a novel fluorene-containing dye for blue photoresist pigment as described in claim 2, characterized in that, In step (2), the molar ratio of the aryl amine to the diamino 9-fluorenone intermediate C is 1:1 to 5:

1.

9. The method for synthesizing a novel fluorene-containing dye for blue photoresist pigment as described in claim 2, characterized in that, In step (2), the dehydration reagent used in the dehydration condensation reaction includes, but is not limited to, one or more selected from phosphorus oxychloride, phosphorus pentachloride, and phosphorus pentoxide.

10. The method for synthesizing a novel fluorene-containing dye for blue photoresist pigment as described in claim 2, characterized in that, In step (2), the temperature of the dehydration condensation reaction is 60℃~150℃.

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