Fluorescent dye and color conversion high molecular material comprising the same

Abstract

This invention relates to a color-converting polymer resin composition and the color-converting polymer material prepared therefrom. The polymer resin composition comprises a first fluorescent dye, a second fluorescent dye, a monomer, and a polymerization initiator. The first fluorescent dye is selected from one or more perylene-based fluorescent dyes, and the second fluorescent dye is selected from one or more naphthalenedicarboximide-based fluorescent dyes. By combining the fluorescent dyes according to the embodiments, a color-converting material that can improve the color rendering index (Ra) while minimizing the color temperature and luminous efficacy changes of LED lighting and is economical can be provided.

Description

Technical Field

[0001] This invention relates to a novel perylene-based red fluorescent dye, a naphthalenedicarboximide-based green fluorescent dye, and color-converting polymer materials containing them. Background Technology

[0002] Phosphors, with their high visibility, have historically been widely used in security products, clothing, and architectural interiors. In recent years, their application in cutting-edge industries such as optics and life sciences has also shown an increasing trend. In particular, fluorescent materials not only improve visibility but also possess a light conversion effect, emitting relatively long-wavelength (low-energy) light after receiving short-wavelength (high-energy) light. This light conversion property is widely used in thin films for plant growth, solar cells, and LEDs.

[0003] Fluorescent dyes can be broadly classified into inorganic and organic fluorescent dyes. Based on the wavelength region of emission, they are further categorized into ultraviolet (UV) fluorescent dyes (receive UV light to emit visible light), visible (receive visible light to emit visible light), and infrared (absorb infrared light to emit infrared light). Inorganic fluorescent dyes exhibit higher stability than organic fluorescent dyes, but they are more expensive and have a higher density, making their application in polymer sheets or films challenging. Conversely, organic fluorescent dyes are more conducive to achieving high-quality fluorescence properties, but obtaining high-purity substances is difficult, and the types of dyes with excellent heat and light resistance are extremely limited, making them significantly more expensive than ordinary industrial dyes.

[0004] Typically, white LEDs are achieved by coating InGaN-based blue LEDs with a wavelength-converting material. The most commonly used wavelength-converting material is the yellow phosphor YAG (Y3Al5O3). 12 :Ce 3+ However, YAG is known to have insufficient luminescence intensity in the red wavelength region, limiting its ability to achieve high color rendering in displays and lighting. To compensate for this deficiency, techniques are typically employed that use fluorescent dyes or quantum dots to compensate for the intensity in the red spectral region. Furthermore, to compensate for the reduced luminous efficiency, fluorescent materials emitting light in the green region are additionally added.

[0005] Relatedly, Korean Patent No. 10-1682859 discloses an LED lighting device with an adjustable color temperature diffuser and its manufacturing method; Korean Patent No. 10-1545309 discloses a color temperature conversion filter for a light-emitting diode, a light-emitting diode module and a lighting device including the same; and Korean Patent No. 10-2187789 discloses a lighting technology using a quantum dot integrated diffuser, characterized in that the quantum dots are red or green.

[0006] However, the materials used in the above technologies are very expensive, which leads to increased manufacturing costs for LED lighting equipment. Furthermore, when red or green fluorescent materials are used to improve color rendering, there is a significant decrease in color temperature.

[0007] Therefore, there is a need to develop an economical fluorescent dye that, due to its high purity and quantum yield, can produce high luminous brightness even with the addition of small amounts of dye. Furthermore, there is a need to develop a color conversion material that can improve color rendering while minimizing luminous efficacy and color temperature variations through appropriate combination of these fluorescent materials. In addition, since the fluorescent dye is mounted on the LED in thin film or sheet form, the presence of undissolved dye or dye re-aggregated during the molding process can lead to a deterioration in the appearance characteristics of the final product. Therefore, there is a need to develop a fluorescent dye with sufficient stability and high solubility for long-term application in LED lighting devices. Summary of the Invention

[0008] Technical problems to be solved

[0009] The purpose of this invention is to provide a novel fluorescent dye that can significantly improve color rendering while minimizing changes in luminous efficacy and color temperature, and a color conversion polymer material utilizing this fluorescent dye.

[0010] Technical solution

[0011] One aspect of the present invention provides a color-converting polymeric resin composition, comprising a first fluorescent dye, a second fluorescent dye, a monomer, and a polymerization initiator, wherein the first fluorescent dye is selected from one or more perylene-based fluorescent dyes, and the second fluorescent dye is selected from one or more naphthalenedicarboximide-based fluorescent dyes.

[0012] According to embodiments, the perylene-based fluorescent dye may be selected from one or more compounds represented by the following [Chemical Formula 1]:

[0013] [Chemical Formula 1]

[0014]

[0015] In the chemical formula 1, R1 is selected from substituted or unsubstituted alkyl groups of C1 to C30 or substituted or unsubstituted aryl groups of C6 to C30.

[0016] According to embodiments, the perylene fluorescent dye may be, for example, a compound represented by [Chemical Formula 1a], but is not limited thereto:

[0017] [Chemical Formula 1a]

[0018]

[0019] According to the embodiments, the naphthalimide-based fluorescent dye may be selected from one or more compounds represented by the following [Chemical Formula 2]:

[0020] [Chemical Formula 2]

[0021]

[0022] In the chemical formula 2, R2 is selected from substituted or unsubstituted alkyl groups of C1 to C30 or substituted or unsubstituted aryl groups of C6 to C30.

[0023] According to the embodiments, the naphthalimide-based fluorescent dye may be, for example, a compound represented by the following [chemical formula 2a], but is not limited thereto:

[0024] [Chemical Formula 2a]

[0025]

[0026] Another aspect of the present invention provides a color-converting polymer material comprising a first fluorescent dye and a second fluorescent dye, wherein the first fluorescent dye is selected from one or more perylene-based fluorescent dyes, and the second fluorescent dye is selected from one or more naphthalenedicarboximide-based fluorescent dyes.

[0027] According to an embodiment, the maximum absorption wavelength of the first fluorescent dye is in the range of 560 to 590 nm, and the maximum emission wavelength is in the range of 600 to 650 nm; the maximum absorption wavelength of the second fluorescent dye is in the range of 420 to 480 nm, and the maximum emission wavelength is in the range of 450 to 500 nm.

[0028] In the color-converting polymer material according to the embodiments, the contents of the first fluorescent dye and the second fluorescent dye can satisfy the following [Equation 1] and [Equation 2]:

[0029] [Equation 1] 4 < (E1 + E2) < 15

[0030] [Equation 2] (E2 / E1) < 0.5.

[0031] In Equations 1 and 2, E1 and E2 are the ppm contents of the first and second fluorescent dyes relative to the total weight of the polymer material, respectively.

[0032] Furthermore, the color-changing polymer material according to the embodiments can satisfy the following [Equation 3] to [Equation 5]:

[0033] [Equation 3] △Ra = (R a,c -R a,0 >10

[0034] [Equation 4] △T = (T0 - T) c <500K

[0035] [Equation 5] △%<15.

[0036] In Equations 3 and 4, R a,c and T c The color rendering index and color temperature value of color-converting polymers containing fluorescent dyes are R. a,0 T0 and T0 are the color rendering index and color temperature value of the color conversion polymer material prepared without the addition of fluorescent dye, and Δ% is the decrease in luminous efficacy when fluorescent dye is added.

[0037] According to the embodiments, the color-converting polymer material can be a polymer sheet, but is not limited to this.

[0038] Technical effect

[0039] The perylene-based and naphthalimide-based fluorescent dyes of the present invention not only possess excellent stability but also excellent solubility, thus exhibiting excellent transparency in the preparation of polymer materials. Furthermore, the dyes exhibit excellent purity and quantum yield (i.e., fluorescence intensity), meaning that adding only a small amount of dye can significantly improve the color rendering index, while the decrease in color temperature and luminous efficacy is relatively small, making them suitable for use as color conversion materials for LED lighting.

[0040] The effects of the present invention are not limited to those mentioned above, and those skilled in the art can clearly understand other effects not mentioned from the following description. Attached Figure Description

[0041] Figure 1 It is a color temperature change curve based on the dye content;

[0042] Figure 2 This is a graph showing the absorption spectrum of the organic fluorescent dye synthesized according to the synthesis example of the present invention;

[0043] Figure 3 This is a graph showing the emission spectrum of the organic fluorescent dye synthesized according to the synthesis example of the present invention. Detailed Implementation

[0044] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings to enable those skilled in the art to readily implement them. The present invention can be modified in various ways and can have various embodiments; specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the invention to specific implementations, and it should be understood to include all modifications, equivalents, and substitutions encompassed within the spirit and scope of the present invention.

[0045] Terms including ordinal numbers such as first and second can be used to describe various constituent elements, but the constituent elements are not limited to these terms. These terms are used only for the purpose of distinguishing one constituent element from others.

[0046] For example, without departing from the scope of the invention, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element. The term "and / or" covers a combination of multiple related entries or any one of multiple related entries.

[0047] Unless otherwise defined, all terms used herein, including technical or scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms commonly used, such as those defined in dictionaries, shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and shall not be construed as having an ideal or overly formal meaning unless expressly defined in this application.

[0048] The fluorescent dyes that can be used in the color-converting polymer materials according to the present invention can be perylene-based or naphthalimide-based fluorescent dyes.

[0049] Perylene-based fluorescent dyes typically possess excellent thermal stability and lightfastness, making them practically used as light conversion materials in displays and LEDs. For example, using perylene-based red fluorescent dyes improves the color rendering index (CRI) of LED lighting, while using perylene-based yellow-green fluorescent dyes improves the luminous efficacy. However, when these fluorescent dyes are applied, the color temperature decreases proportionally with the amount of dye added, leading to a problem where the color temperature of LED lighting is reduced by more than 500K to ensure the desired levels of CRI and luminous efficacy.

[0050] Therefore, in this invention, novel perylene-based and naphthalenedicarboximide-based fluorescent dyes that minimize color temperature changes are synthesized and combined for use in color conversion polymers for LED lighting. This material can improve color rendering while minimizing the reduction in luminous efficacy and color temperature. Furthermore, the novel fluorescent dyes of this invention possess high purity and high quantum yield; only a small amount of dye is needed to achieve the desired properties, resulting in minimal cost increase for the final LED product, making it very economical. They also exhibit excellent thermal stability and lightfastness, sufficient for long-term use in LED lighting devices, and good solubility, thus not impairing the appearance characteristics of the final LED product.

[0051] Specifically, the perylene fluorescent dye according to the present invention may be selected from one or more compounds represented by the following [Chemical Formula 1].

[0052] [Chemical Formula 1]

[0053]

[0054] In the chemical formula 1, R1 is selected from substituted or unsubstituted alkyl groups of C1 to C30 or substituted or unsubstituted aryl groups of C6 to C30.

[0055] Specifically, the naphthalimide-based fluorescent dye according to the present invention may be selected from one or more compounds represented by the following [Chemical Formula 2].

[0056] [Chemical Formula 2]

[0057]

[0058] In the chemical formula 2, R2 is selected from substituted or unsubstituted alkyl groups of C1 to C30 or substituted or unsubstituted aryl groups of C6 to C30.

[0059] In the chemical formulas 1 and 2, when R1 and R2 are substituted or unsubstituted alkyl groups of C1 to C30, the alkyl group can be straight-chain or branched, and can be selected independently from, for example, methyl, ethyl, propyl, n-propyl, isopropyl, butyl, n-butyl, isobutyl, tert-butyl, pentyl, n-pentyl, hexyl, n-hexyl, heptyl, n-heptyl, octyl, n-octyl and their derivatives, but is not limited thereto.

[0060] In the chemical formulas 1 and 2, when R1 and R2 are substituted or unsubstituted aryl groups of C6 to C30, each aryl group may be independently selected from, for example, phenyl, biphenyl, terphenyl, tetraphenyl, naphthyl, anthracene, phenanthryl, pyrene, peryl, triphenyl, hydroxyl, fluorenyl, benzo[a]phenanthryl and their derivatives, but is not limited thereto.

[0061] When the alkyl or aryl groups of R1 and R2 are substituted, the substituents may be one or more selected from alkyl, alkoxy, cycloalkyl, alkenyl, aryl, aralkyl, arylene, alkylaryl, alkylamino, aralkylamino, heteroarylamino, arylamino, arylphosphinyl, halogen group, nitrile group, nitro group, hydroxyl, carbonyl, ester group, aldehyde group, imide group, and amino group, and the number of carbon atoms may be in the range of C1 to C30, but is not limited thereto.

[0062] The color-converting polymeric resin composition according to the embodiments comprises a first fluorescent dye, a second fluorescent dye, a monomer, and a polymerization initiator.

[0063] The maximum absorption wavelength of the first fluorescent dye is in the range of 560 to 590 nm, preferably in the range of 580 to 590 nm. Furthermore, the maximum emission wavelength of the first fluorescent dye is in the range of 600 to 650 nm, preferably in the range of 630 to 650 nm.

[0064] The maximum absorption wavelength of the second fluorescent dye is in the range of 420 to 480 nm, preferably in the range of 420 to 460 nm. Furthermore, the maximum emission wavelength of the second fluorescent dye is in the range of 450 to 500 nm, preferably in the range of 460 to 490 nm.

[0065] The first fluorescent dye may be selected from one or more of the perylene-based fluorescent dyes of [Chemical Formula 1], and the second fluorescent dye may be selected from one or more of the naphthalimide-based fluorescent dyes of [Chemical Formula 2].

[0066] Furthermore, the monomers that can be used in this invention are free radical polymerizable monomers, and there are no particular limitations as long as they are vinyl crosslinking monomers or monomers that can be copolymerized with them. Specific examples of free radical polymerizable monomers include styrene, methylstyrene, ethylstyrene, fluorostyrene, chlorostyrene, aromatic vinyl compounds of vinyltoluene, methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, octyl (meth)acrylate, stearyl (meth)acrylate, benzyl (meth)acrylate, glycidyl (meth)acrylate, etc., and these monomers can be used alone or in mixtures of two or more. In addition, acrylic monomers that can react with compounds having hydroxyl or carboxyl groups can also be used, such as acrylic acid, 2-hydroxyethyl methacrylate, or glycidyl acrylate.

[0067] Furthermore, polymerization initiators can be used without particular restrictions as long as they can form free radicals; for example, benzoyl peroxide, methyl ethyl ketone peroxide, and cumene hydroperoxide can be used. In addition, multifunctional crosslinking agents can be used for crosslinking between polymer chains as needed; for example, one or more of divinylbenzene, ethylene glycol dimethacrylate, diethylene glycol methacrylate, triethylene glycol dimethacrylate, and 1,6-hexanediol dimethacrylate can be used in combination.

[0068] The method for preparing polymeric materials such as films or sheets using the fluorescent dyes of the present invention is carried out as described above by performing a polymerization reaction on a polymeric resin composition containing dyes, monomers, initiators, etc. All methods commonly used in the technical field to which this invention pertains can be employed, and there are no particular limitations.

[0069] In the color-converting polymer material according to the present invention, preferably, based on a sheet with a thickness of 2t (2mm), the contents of the first fluorescent dye and the second fluorescent dye satisfy the following [Equation 1] and [Equation 2].

[0070] [Equation 1] 4 < (E1 + E2) < 15

[0071] [Equation 2] (E2 / E1) < 0.5

[0072] In Equations 1 and 2, E1 and E2 are the ppm contents of the first and second fluorescent dyes relative to the total weight of the polymer material, respectively.

[0073] In color-converting polymer materials, the first fluorescent dye, i.e., red fluorescent dye, should be added at least twice the amount of the second fluorescent dye, i.e., green fluorescent dye, and the total amount of dye should be above 4 ppm and less than 15 ppm. When the content of red fluorescent dye is low, the improvement in color development is minimal, while when the content is too high, it is no longer effective in improving color development and leads to an excessive decrease in color temperature and light efficacy.

[0074] Furthermore, the color-converting polymer materials prepared by adding the first fluorescent dye and the second fluorescent dye preferably satisfy the following [Equations 3] to [Equations 5]:

[0075] [Equation 3] △Ra = (R a,c -R a,0 >10

[0076] [Equation 4] △T = (T0 - T) c <500K

[0077] [Equation 5] △%<15

[0078] In Equations 3 and 4, R a,c and T c The color rendering index and color temperature value of color-converting polymers containing fluorescent dyes are R. a,0 T0 and T0 are the color rendering index and color temperature values ​​of the color conversion polymer material prepared without the addition of fluorescent dye. In [Equation 5], Δ% is the decrease in luminous efficacy when fluorescent dye is added.

[0079] When using color conversion materials containing fluorescent dyes of [Chemical Formula 1] and [Chemical Formula 2], the color rendering index is increased by more than 10, while the color temperature is reduced by less than 500K and the luminous efficacy is reduced by less than 15%, making them very suitable for practical LED lighting.

[0080] The present invention will now be described in more detail through specific embodiments. However, these embodiments are provided as examples to aid in understanding the invention and should not be construed as limiting the scope of the invention thereto.

[0081] <Synthetic Example 1> Synthesis of Perylene-based Red Fluorescent Dyes (Compound 1)

[0082]

[0083] 10 g of 1,6,7,12-tetrachloroperylene-3,4,9,10-tetracarboxylic acid dianhydride, 16.67 g of 2,6-diisopropylaniline, and 250 ml of propionic acid were heated to 80 °C under argon atmosphere and left at this temperature for 17 hours. After cooling to room temperature, crystals were precipitated with methanol, filtered, and dried. 8 g of the dried D-2 powder was mixed with 7 g of 4-methoxyphenol, 6.5 g of K2CO3, and 80 ml of NMP, then heated to 130 °C and stirred for 24 hours. After cooling the reactants to room temperature, 400 ml of 6% HCl was added to precipitate crystals. The crystals were filtered, washed with water, and dried to obtain compound 1 with a maximum absorption wavelength of 589 nm, a maximum emission wavelength of 642 nm, and a molecular weight M = 1199. The final synthesis yield was 75%, and the dye purity, determined by HPLC, was 96%.

[0084] <Synthetic Example 2> Synthesis of Naphthalimide-based Green Fluorescent Dyes (Compound 2)

[0085]

[0086] 20 g of 4-bromo-1,8-naphthalic anhydride, 11.2 g of 2-ethylhexylamine, and 200 g of acetic acid were mixed and heated to 80 °C, then stirred for 12 hours. After cooling to room temperature, crystals were precipitated with methanol, filtered, and dried to obtain compound B-2. 15 g of the reactant was mixed with 15 g of aniline and reacted at 80 °C for 12 hours, then allowed to cool naturally to precipitate crystals. The precipitated crystals were filtered, washed with methanol, and dried to obtain compound 2, with a maximum absorption wavelength of 426 nm, a maximum emission wavelength of 484 nm, and a molecular weight M = 400.5. The final synthesis yield was 86%, and the dye purity, determined by HPLC, was 97%.

[0087] <Example 1>

[0088] 1 kg of methyl methacrylate, 10 g of 2,2-azobis-2,4-dimethylpentanonitrile as an initiator, and 0.004 g of red fluorescent dye (compound 1) prepared by synthesis example 1 were mixed, poured between glass plates, and then polymerized at 60 °C for 20 hours to prepare a color conversion sheet with a thickness of 2 t (2 mm).

[0089] <Example 2>

[0090] Except for mixing 0.006 g of the red fluorescent dye (compound 1) prepared by synthesis example 1 to prepare the sheet, the process was the same as in example 1.

[0091] <Example 3>

[0092] Except for preparing the sheet by mixing 0.006 g of the red fluorescent dye (compound 1) prepared by synthesis example 1 and 0.002 g of the green fluorescent dye (compound 2) prepared in synthesis example 2, the process was the same as in Example 1.

[0093] <Comparative Example 1>

[0094] Except for mixing 0.02 g of the red fluorescent dye (compound 1) prepared by synthesis example 1 to prepare the sheet, the process was the same as in example 1.

[0095] <Comparative Example 2>

[0096] Except that 0.006 g of BASF's commercially available Lumogen Red-305 fluorescent dye was used instead of the red fluorescent dye prepared in Synthesis Example 1 to prepare the sheet, the process was the same as in Example 1.

[0097] <Comparative Example 3>

[0098] Except that 0.01g of BASF's commercially available Lumogen Red-305 fluorescent dye was used instead of the red fluorescent dye prepared in Synthesis Example 1, and 0.005g of Lumogen yellow-083 fluorescent dye was used instead of the green fluorescent dye prepared in Synthesis Example 2, the process was the same as in Example 1.

[0099] <Evaluation Example>

[0100] The absorption spectrum of the fluorescent dye synthesized in this invention was measured using a spectrophotometer (Lamda 950 spectrophotometer, Perkin-Elmer), and the emission spectrum and quantum yield were measured using a fluorescence spectrophotometer (QM-4 / 2005SE, PIT, USA). The fluorescent dye was dissolved in 1 L of methyl methacrylate to determine solubility. For heat resistance evaluation, the sheets prepared according to the examples were heat-treated in an oven at 80°C for 500 hours, and the change in transmittance (DT%) before and after heat treatment at 550 nm was measured. For lightfastness evaluation, the lightfastness grade was determined using a xenon arc lamp (test standard: KS K07000) lightfastness test. If there was no color difference between the exposed and unexposed areas after 80 hours, it was marked as grade 6. The mentioned characteristics are shown in Table 1. Figure 2 and Figure 3 middle.

[0101] Figure 2 It is an absorption spectrum curve of a fluorescent dye, in which compound 1 prepared in synthesis example 1 is represented by (1), and compound 2 prepared in synthesis example 2 is represented by (2).

[0102] Figure 3 These are the emission spectrum curves of fluorescent dyes, where compound 1 prepared in synthesis example 1 is represented by (1), and compound 2 prepared in synthesis example 2 is represented by (2).

[0103] [Table 1]

[0104]

[0105] In addition, the color rendering index and color temperature of the sheets prepared by the examples and comparative examples were measured using a spectroradiometer (Inventfine product), and the results are shown in Table 2.

[0106] Figure 1 It is a color temperature change curve based on the dye content, where (1) represents the color temperature change based on the content of compound 1, (2) represents the color temperature change based on the content of compound 2, (L1) represents the color temperature change based on the content of Lumogen Red, and (L2) represents the color temperature change based on the content of Lumogen Yellow.

[0107] [Table 2]

[0108]

[0109] As shown in Table 1, the fluorescent dye synthesized by this invention not only has a high synthesis yield but also high purity and quantum yield, making it very economical in providing color conversion materials for LEDs. Furthermore, the dye exhibits excellent solubility, with a transmittance change of less than 1% after heat treatment, demonstrating excellent heat resistance, and a lightfastness of up to grade 6, indicating its ability to provide high-quality LED products.

[0110] In addition, by Figure 1 The results in Table 2 confirm that when perylene dye (compound 1) and naphthalene dicarboximide dye (compound 2) are mixed and used in accordance with the contents of [Formula 1] and [Formula 2], a color conversion material for LEDs with excellent properties can be provided, which reduces the color temperature by less than 500K, decreases the luminous efficacy by less than 15%, and increases the color rendering index by more than 10.

[0111] Based on the foregoing description, those skilled in the art to which this disclosure pertains will understand that the present invention can be implemented in other specific ways without altering the technical concept or essential features of the invention. In connection with this, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

Claims

1. A color-changing polymer resin composition, comprising a first fluorescent dye, a second fluorescent dye, a monomer, and a polymerization initiator. The first fluorescent dye is selected from one or more perylene-based fluorescent dyes. The second fluorescent dye is selected from one or more of the naphthalene dicarboximide-based fluorescent dyes.

2. The color-converting polymer resin composition according to claim 1, wherein, The perylene fluorescent dye is selected from one or more compounds represented by [Chemical Formula 1]: [Chemical Formula 1] In the chemical formula 1, R1 is selected from substituted or unsubstituted alkyl groups of C1 to C30 or substituted or unsubstituted aryl groups of C6 to C30.

3. The color-converting polymer resin composition according to claim 2, wherein, The perylene fluorescent dye is a compound represented by the following [chemical formula 1a]: [Chemical Formula 1a] 。 4. The color-converting polymer resin composition according to claim 1, wherein, The naphthalimide-based fluorescent dye is selected from one or more compounds represented by the following [Chemical Formula 2]: [Chemical Formula 2] In the chemical formula 2, R2 is selected from substituted or unsubstituted alkyl groups of C1 to C30 or substituted or unsubstituted aryl groups of C6 to C30.

5. The color-converting polymer resin composition according to claim 4, wherein, The naphthalimide-based fluorescent dye is a compound represented by the following [chemical formula 2a]: [Chemical Formula 2a] 。 6. A color-changing polymer material comprising a first fluorescent dye and a second fluorescent dye, The first fluorescent dye is selected from one or more perylene-based fluorescent dyes. The second fluorescent dye is selected from one or more of the naphthalene dicarboximide-based fluorescent dyes.

7. The color-converting polymer material according to claim 6, wherein: The first fluorescent dye has a maximum absorption wavelength in the range of 560 to 590 nm and a maximum emission wavelength in the range of 600 to 650 nm. The second fluorescent dye has a maximum absorption wavelength in the range of 420 to 480 nm and a maximum emission wavelength in the range of 450 to 500 nm.

8. The color-converting polymer material according to claim 6, wherein, The contents of the first fluorescent dye and the second fluorescent dye satisfy the following [Equation 1] and [Equation 2]: [Equation 1] 4 < (E1 + E2) < 15 [Equation 2] (E2 / E1) < 0.5 In Equations 1 and 2, E1 and E2 are the ppm contents of the first and second fluorescent dyes relative to the total weight of the polymer material, respectively.

9. The color-converting polymer material according to claim 8, wherein, The color-converting polymer material satisfies the following [Equation 3] to [Equation 5]: [Equation 3] △R a =(R a,c -R a,0 >10 [Equation 4] △T = (T0 - T) c <500K [Equation 5] △%<15 In Equations 3 and 4, R a,c and T c The color rendering index and color temperature value of color-converting polymers containing fluorescent dyes are R. a,0 T0 and T0 are the color rendering index and color temperature values ​​of the color conversion polymer material prepared without the addition of fluorescent dyes, and Δ% is the decrease in luminous efficacy when fluorescent dyes are added.

10. The color-converting polymer material according to claim 6, wherein: The polymer material is a polymer sheet.

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