TW201224112A - Light conversion layer comprising an organic phosphor combination - Google Patents

Abstract

A light conversion layer comprising at least one sub-layer, for obtaining light having a color rendering index (CRI) of at least 80, comprising an organic phosphor combination comprising at least one yellow-green emitting dye showing an intrinsic emission below 510 nm, and/or an emission below 530 nm after self-absorption is disclosed. Also disclosed is a light emitting device comprising such a light conversion layer, as well as a method for manufacturing such a device.

Description

201224112 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to a light conversion layer for use in a light-emitting device comprising an organic phosphor combination. [Prior Art] Organic light-emitting molecules (i.e., phosphors) can be used to convert blue light from LEDs into other colors. Phosphors are typically selected to obtain a source of light having a desired correlated color temperature (CCT) and color rendering index (CRI). One problem with this system is the apparent self-absorption of the phosphor. Due to self-absorption and phosphor-phosphor interaction, the emission peak position can be red-shifted up to 50 nm. The effect of this red shift on CRI is most important for phosphors whose emission spectrum is closest to the blue LED emission (in other words, green-yellow phosphor). Due to the apparent red shift of the yellow-green phosphor (due to self-absorption), there will be a gap between the blue color in the spectrum and the green-yellow emission from the phosphor, which greatly reduces the CRI. US 6,903,626 B2 describes a wide range of CCTs from about 3000 K to about 6000 K and CRI from about 60 to 95, depending on the combination of organic light-emitting material and photoluminescent material. However, there is a need in the industry to avoid specific phosphor combinations in which CRI is reduced due to self-absorption of the phosphor. SUMMARY OF THE INVENTION It is an object of the present invention to overcome this problem and to provide a light conversion layer comprising a phosphor combination and resulting in a desired CCT and CRI at high efficiency. According to a first aspect of the invention, this and other objects are obtained by

S 158389.doc 201224112 The color rendering index (CRI) is achieved for a light conversion layer of at least 80 light, the light conversion layer comprising at least one sub-layer and an organic phosphor combination comprising at least one yellow-green luminescent dye, The dye exhibits an intrinsic emission below 510 nm and/or an emission below 530 nm after self-absorption. Suitably, the yellow-green luminescent dye exhibits an intrinsic emission in the range of 450 nm to 510 nm, or 470 nm to 510 nm. Further, the yellow-green luminescent dye suitably has an intrinsic absorption peak in the range of 430 nm to 480 nm. The luminescent layer further includes at least one red luminescent dye and/or at least one orange luminescent dye to provide white light. The red luminescent dye can have, for example, an intrinsic emission in the range of 55 0 nm to 700 nm, and the orange luminescent dye can have an intrinsic emission, for example, in the range of 5 10 nm to 65 50 nm. Suitable examples of yellow-green luminescent dyes are phosphor Lumogen® F yellow 083 (BASF), BASF thermoplastic F 084 green gold (CAS accession number: 2744-50-5), and solvent yellow 98 (CAS accession number: 12671-74) -8); Suitable examples of red luminescent dyes are Lumogen® F Red 305 (BASF), Lumogen® F Pink 285 (BASF), and Lumogen® F Red 300 (BASF). A suitable example of an orange luminescent dye is the phosphor Lumogen® F Orange 240 (BASF) 'Lumogen® F Yellow 170 (BASF), and the compound of the following formula (F2DPI): 158389.doc 201224112

The yellow-green, red, and orange luminescent dyes are incorporated into a single sub-layer, or alternatively the yellow-green, red, and orange luminescent dyes are incorporated into separate sub-layers. For example, a yellow-green luminescent dye may be incorporated into the first sub-layer and red and orange luminescent dyes may be incorporated into the second sub-layer; or a yellow-green luminescent dye and a red luminescent dye may be incorporated into the first sub-layer and may be orange The luminescent dye is incorporated into the second sub-layer; or the yellow-green luminescent dye and the orange luminescent dye can be incorporated into the first sub-layer and the red luminescent dye can be incorporated into the second sub-layer. Suitably, the relative amount by weight of the dye ranges from 1 for yellow-green luminescent dyes, from 〇 to 〇 4 for orange luminescent dyes, and from 〇 to 0.3 for red luminescent dyes. Preferably, the relative amount of the dye is W for the yellow-green luminescent dye, 〇" to 〇3 for the orange luminescent dye, and 〇〇5 to ^2 ^ π for the red luminescent dye. The layer may include - scattering particles (ie, diffuser function). The sub-layer suitably comprises a poly(methyl methacrylate) (ruthenium), a copolymer of polyethylene terephthalate, and a polydip: poly(methyl acetoacetate, acetaminophen, polycarbonate 2: Latexane, and/or acrylate polymer. In one embodiment of the invention, the light converting layer is disposed on the diffuser. I58389.doc 201224112 The present invention is also directed to a light emitting device including the above described light converting layer The light emitting device suitably comprises a light source emitting blue light having a wavelength in the range of 400 nm to 500 nm, preferably 420 nm to 480 nm, more preferably 440 nm to 460 nm. Further, the present invention relates to a method for manufacturing a light emitting device. Included: - providing a light source; and - arranging the light conversion layer to receive at least a portion of the light emitted from the light source. It should be noted that the present invention pertains to all possible combinations of the features recited in the claims. In the application, "Y" means yellow-green phosphor, "◦" means orange phosphor, "R" means red phosphor, and "D" means diffuser. Representation (ROYD), (ROY ) D, (RO) YD, and (Y) (0) (R (D) describes the different configurations of the light conversion layer of the present invention, wherein the capital letters arranged in parentheses refer to the phosphors/diffuses arranged in the common layer. In other words: (ROYD) = mixed to form a single layer Red, orange, yellow phosphor and diffuse particles; (R〇Y) D = red, orange and yellow phosphors mixed in a single layer placed on top of the layer with diffusing particles to form a two-layer stack (R〇) YD=red and orange phosphors are mixed in a single layer placed on top of the yellow layer and the layer with diffuse particles to form a three-layer stack; (R)(0)(Y)(D ) = four separate layers placed one above the other. In the work of producing the present invention, it was unexpectedly found that the self-absorption of the phosphor can be solved by a light converting layer comprising an organic phosphor 158389.doc 201224112 The light body comprises at least one yellow-green luminescent dye having at least some intrinsic emission below 510 nm and/or emission below 530 nm after self-absorption in the substrate to be used (depending on the emission band and absorption band of the dye) Overlap) The phosphors can also be combined with other colors to obtain white light. By using the combination of the present invention, an efficiency >i80 Lm/W〇pt &CRI>80 light can be obtained at 2700 K and 3000 K. Phosphor composition The ability to convert blue light in the wavelength range of 400 nm to 500 nm into light in the wavelength range of 53 〇 111] 1 to 7 〇〇 nm. Self-absorption as used herein refers to some radiation emitted by the phosphor. The process by which the phosphor itself absorbs. In the context of the present invention, "intrinsic emission" refers to the emission of a phosphor without self-absorption. The self-absorption is increased, for example, by increasing the layer thickness or by increasing the concentration of the dye in the layer. In the device, this occurs when the light emitted by the LED is not at the position where the yellow/green band has its maximum value. This means that it is necessary to increase the thickness of the layer or the degree of dye in the layer to sufficiently absorb the LED light as compared to the case where the luminescent molecule will be excited by light corresponding to its absorption maximum. The two concepts, which are the basis of the present invention, are explained by two experiments. The two experiments show the effect of using two different types of green i-color luminescent phosphors. · In the first experiment, there is a picture! The phosphor Lumogen® F Yellow 083 (BASF) (hereinafter "F083") and the blue (450 nm) light-emitting diode are used in combination with the inherent emission characteristics shown in the figure. The material has a low wavelength emission peak at approximately 485 nm and begins to emit I58389.doc 201224112 at approximately 46 〇 (10). This phosphor was combined with a red and orange luminescent phosphor (red/orange weight ratio of 1:1) in the PMMA matrix and exhibited a CRI of 90 at 3000 K. Figure 2 shows the self-absorption effect on the amount of dye in the added layer. It can be seen that the peak at 485 nm begins to disappear and the intensity at 530 nm begins to increase. However, the remaining intensity below 520 nm is sufficient to achieve a CRI greater than 80. At the inverse product, the peak at 485 nm has a full-width half-peak (FWHM) of 20 nm. When a phosphor Lumogen® F Yellow 170 (BASF) having an intrinsic emission spectrum as shown in Fig. 1 (hereinafter referred to as "F1 70") is used, a CCT of 3000 K can be obtained by combining with an orange and red luminescent phosphor. White light. Based on the intrinsic emission spectrum with a strong emission peak at 525 nm, CRI = 80 is expected. However, for all combinations of this phosphor and the orange and red luminescent phosphors, it is not possible to achieve a CRI above ~55. The effect of self-absorption of different amounts of F170 in the PMMA layer is shown in Figure 3. It can be seen here that the peak at 525 nm begins to disappear. Another yellow-green luminescent compound (referred to as F2DPI) was also tested, the structure of which is shown in Fig. 4. This molecule is also combined with orange and red luminescent phosphors. It is also impossible to obtain white light with a CRI higher than 60. The luminescence of this molecule at different thicknesses is shown in Figure 5. (The emission spectrum of the molecule starts at 500 nm; the strong peak at 45 0 nm is used to record the excitation light of the emission spectrum.) These examples show that there is a desired correlated color temperature (CCT) and color rendering index (CRI). The light source can be achieved by careful selection of a green-yellow luminescent dye in the phosphor combination for converting blue light from a source such as an LED. In particular, organic phosphors need to include a yellow-green luminescent dye that absorbs

158389.doc S 201224112 i-light at 450 nm and having at least some inherent emission intensity below 510 nm, and 1 or at least some emission intensity below 530 nm after self-absorption. Therefore, the gap between the blue light in the light 4 and the green-yellow emission from the optical body is sufficiently small to obtain a CRI value higher than 8G. In other words, there will be light (10) in the spectrum to obtain more than 8 〇 cm. The intrinsic emission spectrum of a green luminescent dye is usually composed of several relatively narrow (overlapping) emission peaks', for example, at F〇83, (Fig.) and coffee^(Fig. 5 In this aspect, the phase material refers to the full-amplitude intensity of the deconvoluted half-peak (from the FWHM table tf) to 〇nm to 4〇nm, for example 2〇nm. In this case A condition having at least some intrinsic emission below 51 〇 nm is satisfied by exhibiting at least one intrinsic emission peak below 51 〇 nm 2 . Alternatively, the intrinsic emission spectrum of the yellow-green luminescent dye may be one or more A wide emission band (ie, FWHM above 40 nm) is composed. An example of an emission spectrum consisting of a wide band is shown in Figure 1. The densely imaginary trace is inherently emitted' and the loosely imaginary trace is re-absorbed. In this case, even if the maximum value of the intrinsic emission band is higher than 51 〇 nm, it is satisfied that at least some are lower than 51 〇 nm by making the spectral position of the intrinsic emission band at the short-wavelength edge at the half-peak intensity lower than 510 nm. Inherent emission conditions. In the case of more than one wide emission band, the spectral position of the short wavelength edge at the half-peak intensity of a deconvolution intrinsic emission band should be below 510 nm. In the context of the present invention, when at least one intrinsic emission When the spectral position of the short-wavelength edge at the peak intensity of the peak is lower than 51 〇 nm, it is considered that the characteristic "displays at least one inherent emission below 5 10 nm" is satisfied.

S 158389.doc 201224112 Similarly, in the context of the present invention, when the spectral position of the short-wavelength edge at the half-peak intensity of at least one of the emission peaks after self-absorption is lower than 530 nm, it is considered that the characteristic "displays at least one after self-absorption" Emissions below 530 nm". Luminescent devices including Lumogen F083 (greenish yellow), Lumogen F240 (orange), and Lumogen F305 (red) have unexpectedly been found to produce excellent efficiency in terms of efficiency and CRI. Other suitable phosphorescent systems such as BASF thermoplastic F 084 green gold (CAS accession number: 2744-50-5) may be used in accordance with the present invention in place of F083 (i.e., as a yellow-green luminescent dye having at least some inherent emission below 510 nm). And Solvent Yellow 98 (CAS registration number: 12671-74-8). Other suitable light systems that can be used in place of F240 and F305 (i.e., as orange-red luminescent dyes) in combination with yellow-green luminescent dyes to achieve CRI greater than 80 in accordance with the present invention, such as Lumogen® F Pink 285 (BASF), Lumogen® F Red 300 (BASF), Lumogen® F Yellow 170 (BASF), and F2DPI (see Figure 4). In addition, by routine experimentation, those skilled in the art will be able to find other phosphors having the desired properties as defined in the accompanying claims. The amount of red-orange luminescent dye to be used in combination with at least one yellow-green luminescent dye having at least some intrinsic emission below 510 nm may be any number, preferably from 1 to 5, more preferably 2. Lumogen can be incorporated into a common layer or a separate layer. Different color points can be achieved by using different layer thicknesses and/or different luminescent dye concentrations in the layer. The concentration of the dye in the matrix material is preferably less than 5 wt%, more preferably less than 0·1 158389.doc -10- 201224112 wt%. Preferably, the total layer thickness is less than 3 mm, more preferably less than 500 microns. When a wide structure is used, the thickness of the individual layers is preferably less than i mm, more preferably less than 100 microns. Suitably, the red and orange luminescent dyes are mixed in one layer, and the green-yellow luminescent dyes in the separate layers and the third layer have a diffusing function. The layers are stacked one on top of the other in a sequence (R0) YD (i.e., red + orange - yellow-green diffuser) where the red-orange layer is closest to the blue source (although the order of the layers can be changed). Another option is to 'mix all three lumogens in a single layer' where the diffuser layer is at the top. In another embodiment, all components (red, shaded, greenish yellow lum〇gen and light scattering particles for diffuser function) are incorporated into a single layer. The relative amount of weight of lumogen in each of the suggested embodiments ranges from 1 for yellow, from 〇 to 〇·4 for orange and from 0 to 0.3 for red (depending on target CCT) ). More preferably, the amount of the orange dye ranges from 0.1 to 0.3 with respect to the amount of the yellow-green dye, and the amount of the red dye ranges from 0.05 to 0.2. Suitably, the lumogen is incorporated into a layer of poly(p-methyl methacrylate) (PMMA). Other materials that can be used as a substrate include polyethylene terephthalate (PET), copolymers of PET, polyethylene naphthalate (PEN), poly(methyl methacrylate) polystyrene, polycarbonate Ester, polyoxo, polyoxonium, and acrylate polymers. When several phosphor/diffuser layers are incorporated, the layers are arranged to be in optical contact with each other. 158389.doc -11 - 201224112 In terms of diffuser function, inorganic particles or polymer scattering particles such as alumina or titanium oxide particles can be incorporated into the layer. As used herein, "dye", "phosphor" and "Luin〇gen" are used interchangeably to describe a luminescent material that converts light of a first wavelength to light of a second wavelength. Suitable light sources to be used in accordance with the present invention are, for example, light emitting diodes (LEDs), lamps or lasers. Preferably, the light source to be used in accordance with the present invention emits blue light having a maximum intensity in the wavelength range of 400 nm to 500 nm, preferably 420 nm to 480 nm, and more preferably 440 nm to 460 nm. A light-emitting device comprising the phosphor combination of the present invention can be fabricated in the following manner: The dye is mixed in a polymer and then a film is produced. This can be carried out by first producing a dye-containing compound and ultimately producing a diffuser particle. Thereafter, the particles can be melt processed (extruded) to produce a film of the luminescent material in the polymer matrix. In an alternative method, the polymer and dye can be dissolved in a suitable solvent and then applied to the top of the substrate to produce a luminescent coating. Various configurations can be used to create the device. Two illustrative examples of a light-emitting device comprising the light-converting layer of the present invention are shown in the drawings. Figure 6a shows the configuration of an LED placed in a mixing chamber with a highly reflective surface' which is otherwise referred to as a downlight. A light conversion unit is placed at the exit surface for generating white light. The configuration in which the led is placed at the bottom half of the cylinder covered with the highly reflective diffuser is shown in the figure. The other half of the cylinder is covered by a light conversion layer from which light exits the device. Example Example 1: Hierarchical system (Y) (〇) (R) (D) 158389.doc •12· 201224112 Using three Lumogen: F083,

Lumogen® F Red 305 (BASF) (hereinafter referred to as F305), and

Lumogen® F Orange 240 (BASF) (hereinafter referred to as F240) uses four separate layers in the device schematically shown in Figure 6a. The use of three different Lumogen emitters results in white light with high efficiency and high CRI. The red/orange ratio (by weight) used in PMMA was 1, and a CRI greater than 95 and an efficiency exceeding 190 Lm/Wopt were obtained for both 2700 K and 3000 K. Example 2: Combining red and orange in a single layer [(RO)YD] Lumogen F083 (yellow-green), Lumogen F240 (yellow) and Lumogen F305 (red) were used as phosphorescence in the configuration shown in Figure 6a body. Red and orange Lumogen were mixed in PMMA foil. This foil was used in combination with a foil containing yellow-green Lumogen and placed on top of the diffuser film. Ensure optical contact between the layers. Different color points are obtained by using different thicknesses of red/orange foil (RO) and yellow foil (Y). The foils were applied to the standard diffuser (D) by keeping the dye concentration constant in the box. Figure 7 shows the efficiency and CRI as a function of R/(R + 〇) (i.e., the weight of F305 relative to the sum of the weights of F305 and F240 in the red/orange foil). The performance of the spotlight (=6a) is measured in the integrating sphere. The conversion efficiency (CE) is defined as the lumens from the white downlight (i.e., including the light conversion layer) divided by the optical watts of the blue light from the same downlight (Fig. 6a) (i.e., without the light conversion layer and diffuser). For this system, for R/(R+O) = 0.6, the efficiency of the black body line (BBL) 158389.doc -13- 201224112 at CCT=3000 K is estimated to be 187 Lm/Wopt, where CRI is approximately 88. In this case the efficiency of the organic phosphor system is comparable to that of the inorganic remote photostructure system. Due to the use of three different Lumogen and one blue source spectrum, there are more than one solution that can result in the same white point. More experiments were performed using different R/(R+0) ratios. Surprisingly, it was found that the same CRI can be obtained using different combinations of Lumogen with significantly different efficiencies. For example, at 3000 K (Fig. 7), the efficiency is only 180 Lm/Wopt for R/(R+O) = 0.6 or 210 Lm/Wopt for R/(R+O) = 0.2, The CRI may be 85. As the orange fraction (=reduce red fraction) increases, CE increases. This is expected to increase the lumen equivalent of the spectrum by replacing the red (low LE) with orange (high LE). The spectra of the different configurations are given in Figure 8 (all interpolated to 3 000 K on the BBL). Note that the spectral contributions of the three components are different from the weight ratio. The spectral ratios of red and orange from different spectra are shown in Figure 9 as a function of weight. It can be seen that in the range of R/(R+0) of 0.2 to 0.6, the spectral ratio changes only slightly. However, as shown above, these spectral changes have a significant impact on efficiency and CRI. Example 3: Combination of red, orange, and yellow in a single layer (ROY) D In Example 2, orange and red Lumogen were mixed in a single layer of PMMA and yellow Lumogen and diffuser were in separate layers (all Optical contact). In this example, we describe an experiment with three Lumogens in a single layer and a diffuser at the top, which uses Lumogen F083 (yellow), Lumogen F240 (orange), and 158389 in the configuration shown in Figure 6b. Doc -14· 201224112

Lumogen F305 (red) acts as a light barrier. Different color points are obtained by adjusting the concentration and thickness of the lumogen layer. In the first example, the ratio R/(R+0) Lumogen was fixed to 0.3 (derived from the (RO) YD system, Example 2). Use the configuration of Figure 6b to measure the efficiency and CRI of the system in the integrating sphere. Relative to the results in Example 2, the fact that the CRI was lowered, the red reproduction was lowered, and the efficiency was increased, indicating that the spectral contributions of yellow, orange, and red were changed. When studying the spectra of different systems, it was found that the spectrum of the (ROY)D system with R/(O+R)=0.3 is more similar to R/( for the (RO)YD system due to the mixing of different lumogens in one layer. O+R) = 0,15 spectrum, ie CRI below 80. In the case where three lumogens are mixed into a single layer, it is necessary to adjust the weight ratio of the red and the color detection lumogen to obtain the desired CRI. It has been found that for the (ROY)D system, the R/(R+0) weight ratio of 0.35 is close to optimal, resulting in a CRI of 84 at CCT 3000 K. Example 4: Combining red, orange, yellow, and scattering particles in a single layer (ROYD) using Lumogen F083 (yellow), Lumogen F240 (dial), and Lumogen F305 (red) as the configuration shown in Figure 6b Light body. In this example, all components (three lumogens and scattering particles) were mixed into a single layer. R/(〇+R) by weight was fixed at 0.35 to obtain CRI = 80 at 3000 K with maximum efficiency. At lower concentrations of R, the CRI is below 80. Measure the efficiency and CRI of the system in the integrating sphere. Again, the CRI is lower than the (RO)YD system (at the same R/(0+R) weight ratio) and the CRI is lower. CRI and efficiency can be adjusted by adjusting the R/(0+R) ratio. 158389.doc -15- 201224112

Example 5: Using (ROYD), (R) (0) (Y) (D), (ROY) D, (RO) YD using three Lumogen: F170,

Lumogen® F Red 305 (BASF) (hereinafter referred to as F305), and

Lumogen® F Orange 240 (BASF) (hereafter referred to as F240) Lamps can be made using a blue LED source with CCT = 3000 K. However, it is not possible to obtain a CRI greater than 60. Those skilled in the art will recognize that the present invention is in no way limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows the emission spectrum of the luminal Lumogen® F Yellow 083 (BASF) and the phosphor Lumogen® F Yellow 170 (BASF) in the absence of self-absorption. Figure 2 shows the effect of self-absorption on the emission spectrum of the phosphor Lumogen® F Yellow 083 (BASF). Figure 3 shows the effect of self-absorption on the emission spectrum of the phosphor Lumogen® F Yellow 170 (BASF). Figure 4 shows the structure of the phosphor molecule F2DPI. Figure 5 shows the luminescence of phosphor molecules F2DPI from various thicknesses. Figures 6a and 6b show different configurations of a light-emitting device comprising a light converting layer of the present invention. Figure 7 shows the efficiency and CRI as a function of R/(R+0) for devices containing red and orange phosphors 158389.doc -16· 201224112 ((RO)YD system) combined in a single layer. Figure 8 shows the interpolated white spectrum of the Lumogen combination, as measured in the downlight module (CCT = 3000 K). Figure 9 shows the relationship between the red phosphor spectral fraction based on the spectrum of Figure 8 and the red phosphor weight fraction for the (RO) YD system. Figure 10 shows the theoretical emission spectrum of a yellow-green luminescent dye composed of a broad emission band. [Main component symbol description]

10 LED 20 mixing chamber 30 light conversion unit

40 LED 50 Covering the bottom half of the cylinder with a highly reflective diffuser 60 The other half of the cylinder covered by the light conversion layer 158389.doc · 17·

Claims (1)

201224112 VII. Patent Application Range: 1. A light conversion layer for obtaining light having a color rendering index (CRI) of at least 80, comprising: at least one sublayer, and an organic disc combination comprising at least one yellow A green luminescent dye that exhibits an intrinsic emission below 5 10 nm and/or an emission below 530 nm after self-absorption. 2. The light conversion layer of claim 1, wherein the yellow-green luminescent dye exhibits intrinsic emission in the range of 450 nm to 5 10 nm, or 470 nm to 5 10 nm. 3. The light conversion layer of claim 1 or 2, wherein the yellow-green luminescent dye has an intrinsic absorption peak in the range of 43 0 nm to 480 nm. 4. The light converting layer of claim 1 or 2, further comprising at least one red luminescent dye and/or at least one orange luminescent dye. 5. The light conversion layer of claim 4, wherein the red luminescent dye has an intrinsic emission in the range of 550 nm to 700 nm. 6. The light conversion layer of claim 4, wherein the orange luminescent dye has an intrinsic emission in the range of 510 nm to 650 nm. 7. The light conversion layer of claim 4, wherein the yellow-green luminescent dye-based light-filling material Lumogen® F Yellow 083 (BASF), BASF thermoplastic plastic F 084 green gold (CAS accession number: 2744-50-5), or Solvent Yellow 98 (CAS Accession No.: 12671-74-8); Red Luminescent Dye Phosphor Lumogen® F Red 305 (BASF), Lumogen® F Pink 285 (BASF), or Lumogen® F Red 300 158389.doc 201224112 (BASF), and the orange luminescent dye is a compound of Lumogen® F Orange 240 (BASF), Lumogen® F Yellow 170 (8 8 3?), or the following formula (?2〇卩1): 8. The light conversion layer of claim 4, wherein the yellow-green, red, and orange luminescent dyes are incorporated into a single sub-layer. 9. The light conversion layer of claim 4, wherein the yellow-green, red, and orange luminescent dyes are incorporated into separate sub-layers. 10. The light conversion layer of claim 4, wherein the (3) green luminescent dye is incorporated into the first sub-layer and the red and orange luminescent dyes are incorporated into the second sub-layer, or the yellow-green luminescent dye and the red The luminescent dye is incorporated into the first sub-layer and the orange luminescent dye is incorporated into the second sub-layer, or the yellow-green luminescent dye and the orange luminescent dye are incorporated into the first sub-layer and the red luminescent dye is incorporated into the second sub-layer in. 11. The light converting layer of claim 8 wherein the relative amount of weight of the dye ranges from 1 for the yellow-green luminescent dye, 0 to 0.4 for the orange luminescent dye and for the red luminescent dye Preferably, it is 丨, preferably 丨 for the yellow-green luminescent dye, U 0.3 for the orange luminescent dye and 0.05 to 0.2 for the red luminescent dye 158389.doc 201224112. At least one of the sub-layers such as §Hai includes scattering particles. Wherein the sub-layers comprise poly(mercaptopropene 12. The light-converting layer of claim 8 or in a separate sub-layer. 13. The light conversion layer of acid vinegar of claim 8) (PMMA), poly-pair Ethylene diacetate (ρΕΤ), copolymer of ρΕτ, polyethylene naphthalate (ΡΕΝ), poly(methyl propyl ketone) polystyrene, polycarbonate, polyfluorene oxide, polyoxyl Alkane, and / or acrylate polymers. 14. The light conversion layer of claim 1 or 2, wherein the light conversion layer is disposed on the diffuser. 15. A light-emitting device comprising the light-converting layer of any one of claims 14 to 16. 16. The light-emitting device of claim 15, comprising an emission wavelength range of 4 〇〇 nm to 500 nm, A source of blue light from 420 nm to 480 nm, more preferably 44〇11111 to 460 nm. 17. A method for manufacturing a light emitting device according to claim 15 or 16, comprising: providing a light source; and arranging a light conversion layer according to any one of claims 1 to 14 to receive light emitted from the light source At least part of it. 158389.doc