JP4350232B2 - Fluorescent coating manufacturing support method and manufacturing support system thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is a method for supporting the manufacture of a fluorescent coating that covers a semiconductor light emitting device such as a light emitting diode (hereinafter referred to as LED) or other light emitting device to convert the light emission color of the deviceas well asSupport systemToRelated.
[0002]
[Prior art]
Conventionally, LEDs are known as light sources having low power consumption and long life. LEDs emit light of a specific wavelength due to the type of base material, etc., and those that mainly emit light of the three primary colors of R, G, and B are manufactured and applied to various uses other than light sources. Has reached.
[0003]
In recent years, a fluorescent material that excites light of a specific wavelength is formed on a filter, and this is covered with an LED to obtain a white emission color as a composite color. By obtaining white light, its application is expanded, and by further mounting a filter formed containing a desired colorant, white can be changed to another arbitrary emission color. is there.
[0004]
On the other hand, in recent years, a white LED having a blue LED chip YAG (yttrium aluminate) phosphor layer has been proposed. In the white LED, the light excited by the phosphor layer and the light from the blue LED are combined to produce white light. This white LED can obtain a desired emission color by mounting a color filter containing a colorant.
[0005]
[Problems to be solved by the invention]
However, even with LEDs manufactured using the same material, the light emission characteristics, that is, the color tone, cannot all be uniformly manufactured due to variations in the component material side (chips, etc.) and the operating environment on the manufacturing equipment side. Have variations. FIG. 5 shows the distribution of chromaticity obtained by emitting light from a plurality of arbitrarily selected blue LED samples. As shown in FIG. 5 (standard color system based on CIE (International Lighting Commission)), each blue LED has chromaticity coordinates (x, y) = (0.207, 0.116) of sample A to Variation in chromaticity is observed in the range of chromaticity coordinates (x, y) = (0.359, 0.067) of sample B. This variation is visible because there is a difference of 0.01 or more in chromaticity. Therefore, even if color conversion is performed by covering such a blue LED with a filter containing the same phosphor, light obtained can be obtained. The color tone still varies, and it could not be said that the user's request could be satisfied depending on the application. In addition, even when a color filter containing a colorant is further attached to a blue LED converted into white light by a phosphor filter, there is a problem in a significant decrease in brightness and discoloration.
[0006]
On the other hand, FIG. 6 shows the distribution of chromaticity obtained by emitting a plurality of arbitrarily selected white LED samples. The variation in color tone of the blue LED chip itself, the amount of phosphor added on the chip, As a result of the effect of color tone variations caused by layer thickness variations and the like, both the chromaticity x and y values have variations of about 0.05. Therefore, even if the white LED is coated with the same filter containing the phosphor and converted into a predetermined color, the color tone of the light obtained is more varied than in the case of the blue LED, and the colorant There is a problem similar to the case of the blue LED with respect to the mounting of the color filter containing the.
[0007]
Therefore, the manufacturer performs color measurement work, sorts the blue (or white) LEDs into finer tone ranges within the range of variation, assigns them to ranks, and manages them on the user side. For the sorted LEDs, the color measurement work is further performed to sort the color tone range set corresponding to the required color accuracy, and only the LEDs that satisfy the requirements are used, resulting in poor yield. And it was costly.
[0008]
The present invention solves the above-mentioned conventional problems, and provides a manufacturing process with a fluorescent coating that can change the emission color after conversion into a more uniform color for each of the sorted light-emitting elements. It is an object of the present invention to provide a manufacturing support method, a system thereof, and a fluorescent coating for a light emitting device manufactured using the method.
[0009]
[Means for Solving the Problems]
  The method for supporting the manufacture of a fluorescent coating according to the present invention includes a light source color of a light emitting element.CIE standard color system chromaticity coordinates (x, y)WhenBy covering the light emitting element with a fluorescent coating, the aboveRequired emission color obtained by converting light source colorCIE standard color system chromaticity coordinates (x1, y1)Relationship withIncluded in the fluorescent coatingFactors associated with phosphor materialsadThe light source color of a specific light emitting elementThe above chromaticity coordinates (x, y)And required emission colorChromaticity coordinates of (x1, y1)To the coefficientadThe coefficient obtainedadFromShould be included in the fluorescent coatingThe phosphor material is specified.
[0010]
  According to this configuration, the light source color information of the specific light emitting element(CIE standard color system chromaticity coordinates (x, y))And required emission color information(CIE standard color system chromaticity coordinates (x1, y1))For example, when an external customer (manufacturer or user) presents the relationship between the light source color information of the light emitting element and the required light emission color information through a coefficient related to the phosphor material The light source color information and the required light emission color information of the specific light emitting element presented are applied to first determine the coefficient, and then immediately specify the phosphor material related to the determined coefficient. The specified material is one that matches the required emission color information or approximates to a plurality of prior data obtained in advance (when there is no match). As a result, the type of phosphor material that substantially satisfies the required emission color information requested by the customer, the composition ratio, the mixing ratio (parts by weight) with respect to the base material, etc. are used as the phosphor specifying information until the light emitting element is actually obtained. It is possible to obtain the information quickly, and it is possible to promptly present such phosphor material specific information to the customer as needed, and if the manufacturing approval (manufacturing order) is received, the shape etc. must be known. In addition, it is possible to immediately manufacture a fluorescent coated body having a shape that can be coated on the light emitting element.
[0011]
Here, the light emitting element having light source color information obtained from the customer is classified into each finer tone range within the range of variation in the manufacturer as described above if the customer is a manufacturer. In addition, if the customer is a user, it is after being sorted into a color tone range set corresponding to the required color accuracy on the user side. Therefore, a fluorescent coating that can change the light emission color after the conversion to the light emitting element for each sorting into a more uniform color tone that does not exceed the color tone variation for at least the sorting is created. The In addition, even when the required emission color information required for different classifications is the same, it is possible to obtain the material specific information of the phosphor from the light source color information for the different classifications, and thereby the light emission for the different classifications. Even if it is an element, it becomes possible to make the color tone after coating | covering the same by coat | covering the fluorescent coating body manufactured corresponding to each classification | category part.
[0012]
  Claim1In the described invention, the relation is expressed by a determinant of Formula 3, and coefficients a, b, c, and d are obtained from the determinant, and a phosphor material is specified from the obtained coefficients a to d. It is what you do.
[0013]
[Equation 3]
[0014]
    Where x, y: light source color of light emitting elementCIE standard color system chromaticity coordinates
          x1, y1:For light emitting elementObtained by covering with fluorescent coatingEssentialLuminescent colorCIE standard color system chromaticity coordinates
  According to this configuration, the determinant is stored in advance, and the coefficients ad may be calculated by substituting the light source color information and the required color information into this determinant. Since the number of coefficients is four, in order to specify these coefficients in calculation, it is necessary to obtain at least two types of light source chromaticity information of the light emitting elements for one required emission chromaticity x1, y1. is there. These two types are included in the same sort. The two types of information may be selected at random, or may be information of appropriate values that vary in the opposite direction with respect to the average chromaticity of the light emitting elements for the sorting.
[0015]
  Claim2In the described invention, information specifying the phosphor material is recorded in a table format in association with the coefficients a to d, and the phosphor material specifying information matching the obtained coefficients a to d is read from the table and notified. It is what you do. Thus, if the phosphor material in the table is owned, the production of the phosphor coating can be started immediately when the relevant phosphor material identification information is read and notified.
[0016]
  Claim3According to the described invention, if this phosphor material is specified by the type, composition ratio, and mixing ratio (parts by weight) with respect to the base material, accurate reproducibility becomes possible. Since the phosphor is specified prior to the arrival of the light emitting element, if the element shape, dimensions, and the like are available, a fluorescent coating using the specified phosphor material can be quickly manufactured.
[0017]
  Claim4The described fluorescent coating manufacturing support system is a light source color of a light emitting element.CIE standard color system chromaticity coordinates (x, y)WhenBy covering the light emitting element with a fluorescent coating, the aboveRequired emission color obtained by converting light source colorCIE standard color system chromaticity coordinates (x1, y1)Whenconnection ofTheIncluded in the fluorescent coatingFactors associated with phosphor materialsadStorage means that associates and memorizes via a light source and the light source color of a specific light emitting elementThe above chromaticity coordinates (x, y)And required emission colorChromaticity coordinates of (x1, y1)To the coefficientadFirst computing means for obtaining the coefficient and the obtained coefficientadFromShould be included in the fluorescent coatingAnd a search means for extracting information for specifying the phosphor material. AlsoThisThe storage means stores the number 4, the first calculation means obtains the coefficients a, b, c, and d by, for example, reverse calculation, and the search means conforms to the obtained coefficients a to d. Information to identify the phosphor material to beThe
[0018]
[Expression 4]
[0019]
    However, x, y:Light emitting elementLight source colorCIE standard color system chromaticity coordinates
          x1, y1:For light emitting elementObtained by covering with fluorescent coatingEssentialLuminescent colorCIE standard color system chromaticity coordinates
  Claim5In the described invention, the storage means stores information specifying the phosphor material in the form of a table in association with the coefficients a to d, and the search means uses the coefficients a to d obtained by the first calculation means. Applicable phosphor material specifying information is extracted from the table. Claims6In the described invention, the storage means stores the phosphor material as information specifying the type of the fluorescent material, the composition ratio, and the mixing ratio with respect to the base material.
[0020]
  Claim7The invention described is characterized by comprising data communication means capable of receiving light source color information and required light emission color information of the light emitting element from an external terminal.8The invention according to the description is based on the predicted emission color determined from the extracted phosphor material identification information and light source color information of the light emitting element.CIE standard color system chromaticity coordinatesAnd a data communication means for calculating the predicted emission color information.(CIE standard color system chromaticity coordinates)Is transmitted to the external terminal. As a result, it is possible to predict the characteristics of the manufactured fluorescent coating from the stage where the actual light emitting element is not available, and to provide quick manufacturing transfer.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
  FIG. 2 is a longitudinal sectional view showing an example of a filter manufactured using the support system. In FIG. 2, the filter 11 as a fluorescent coating is formed in a shape along the outer shape of a resin part in which the chip part of the LED 12 is molded, such as a spindle shape (or hemisphere), and is preferably set to a uniform predetermined thickness. Has been. This filter 11 is a mixture of a phosphor and resin as a base material,12LED light source light and light excited by a phosphor using a part of the light source light. And are mixed. Details of the manufacturing method will be described later.
[0023]
FIG. 1 is a block diagram showing a control configuration in an embodiment of a fluorescent coating production support system according to the present invention. In FIG. 1, a fluorescent coating manufacturing support system 1 is configured by a computer, and includes a CPU (Central Processing Unit) 2, a ROM (Read Only Memory) 3, a RAM (Random Access Memory) 4, and an operator. An input unit 5 for performing various operation commands and a display unit 6 having a display screen are provided, and a transmission / reception unit 7 as a data communication means capable of communicating with the outside is provided.
[0024]
The CPU 2 controls the operation for each unit in an integrated manner. The ROM 3 stores a manufacturing support program for supporting the manufacturing of the fluorescent coating applied to the present invention in addition to an operation control program for performing basic operations of the respective units, as shown in Table 1 described later. Table data is stored. The RAM 4 is for temporarily storing data being processed by the CPU 2. The input unit 5 includes a keyboard, a mouse, and a pointing device (touch panel). The input unit 5 is used for inputting necessary data and various operations for the CPU 2 from an operator. The display unit 6 is composed of a liquid crystal display device, a CRT display device, etc., and displays the operator's input data and the contents of the input command in a confirming manner and displays the results obtained by the processing based on the manufacturing support program as appropriate. It is. Moreover, a printer may be provided as necessary, and the obtained processing result (phosphor material specifying information) may be printed out on the printer.
[0025]
The transmission / reception unit 7 enables data communication via a public telephone line (wired and wireless), a facsimile, and a network (including electronic mail) such as a dedicated line or the Internet. The transmission / reception unit 7 is not limited to the one controlled by the CPU 2 and may operate in response to individual instructions. Further, a communication function may be incorporated in the system, and the obtained result may be transmitted directly (or in response to a transmission instruction from the operator) to the customer.
[0026]
The CPU 2 includes calculation means 21 and search means 22. The computing means 21 performs the following calculation using the determinant shown in Formula 5 based on the manufacturing support program. In other words, the light source chromaticity coordinates x and y of two types of LEDs presented by the customer and the required chromaticity coordinates x1 and y1 of the emission color obtained in a state where the fluorescent covering is attached to the LED are related to the phosphor material. The coefficients a to d are calculated. Also, predicted chromaticity coordinates x1, y1 are calculated from the specified coefficients a to d and the light source chromaticity coordinates x, y.
[0027]
[Equation 5]
[0028]
Here, x and y are coordinates indicating the light source chromaticity representing the light emission color of the LED, and ad are inherent coefficients (constants) determined by the type, composition ratio, and weight part (mixing ratio with respect to the base material) of the fluorescent material. X1 and y1 are coordinates indicating the above-described required chromaticity and predicted chromaticity in a state where a fluorescent covering (hereinafter referred to as a filter) is mounted. Note that when calculating the coefficients a to d, the calculation is performed using a formula in which the equation 5 is calculated back to obtain the coefficients a to d. However, there is no substantial difference in the concept of the formula. This is shown by the mathematical formula 5.
[0029]
The ROM 3 has a registration data storage unit 31 for storing data of Table 1 described later, and the search means 22 uses the coefficients a to d as search parameters from Table 1 in the registration data storage unit 31 as described later. The required phosphor material is extracted.
[0030]
Next, a manufacturing support processing procedure will be described. ◇
First, the preparation of Table 1 as a preliminary work prior to the operation of the manufacturing support system will be described by taking as an example a phosphor material that converts blue light source light into white light.
[0031]
Filters are manufactured using various materials (types of fluorescent raw materials, composition ratios and parts by weight) with respect to chromaticity coordinates x and y of a blue LED that emits light in a certain color tone, and these filters are respectively coated on the blue LED. Then, color measurement is performed to obtain actually measured chromaticity coordinates x1, y1. On the other hand, specific coefficients a to d specified in accordance with the type, composition ratio, and weight part of the fluorescent material contained in each filter are obtained.
[0032]
Subsequently, a plurality of filters are manufactured in the same manner as described above for a blue LED having a color tone slightly different from that of the previous blue LED, and the color measurement is performed to obtain the actually measured chromaticity coordinates x1 and y1, and the material-specific coefficient a ~ D is determined. As the filter in this case, the filter used for the blue LED may be used as necessary. Naturally, the color tone of the white light obtained when each filter is covered is slightly different depending on the color tone of the blue LED as the light source. Only the information is regarded as valid information, and other information, that is, out of the allowed white color tone is excluded.
[0033]
Further, the same operation is performed for each blue LED having a slightly different color tone. Here, the slightly different color tone of the blue LED is for each of the divided ranges described above so that it can be regarded as substantially the same color tone. While it is preferable to perform the above operation for all the blue LEDs, in the present embodiment, the preliminary operation for obtaining information about the blue LEDs for each classification range is stopped from the relationship between the enormous amount of information and the operation amount. Then, a table as shown in Table 1 is created for each blue LED in each section.
[0034]
In addition to the blue LED, such prior work includes the relationship between the LEDs having other emission colors such as red LEDs and green LEDs in each section, and filters that can be converted into white light of slightly different colors, that is, coefficients, etc. To ask.
[0035]
Table 1 shows corresponding information (type of fluorescent material, composition ratio and parts by weight) and specific coefficients a to d for at least each of the obtained color-coded LEDs corresponding to each material. It is written in the registered data storage unit 31 in a table format. The registration data can be written using the input unit 5, or when data is input on the color measuring device side, the data can be transferred from the measuring device and written to the registration data storage unit 31. .
[0036]
Table 1 shows an example of the contents stored in the registration data storage unit 31 described above, and is data relating to a certain category of blue LEDs. Table 1 shows an example in which a YAG phosphor is used as the phosphor. In order to obtain each white light, the composition ratio, the weight part, and the coefficients a to d specific to each are shown in a table format. In the table, LEDs of each category are grouped, and among them, the type and composition ratio of each fluorescent material are shown for each part by weight (in Table 1, 20 parts by weight and 25 parts by weight are shown). Has been.
[0037]
The format of the table is not limited to Table 1 and may be a single table.
[0038]
[Table 1]
[0039]
  After this preliminary work, the following manufacturing support processing procedure can be executed.
  FIG. 3 is a flowchart showing an example of a manufacturing support procedure in the manufacturing support system. First, in step S1, two types of light source color information (chromaticity coordinates x and y) and required chromaticity coordinates x1 and y1 (for each segment) are externally (customer; manufacturer or When the data is input from the user's communication terminal device via the transmission / reception unit 7 or when the data is obtained by voice from a facsimile or telephone5To wait for data input by the operator via If light source color information (chromaticity coordinates x, y) and desired required chromaticity coordinates x1, y1 are input (Y in step S1)ES), The input information is temporarily stored in the RAM 4, and then the coefficients a to d are calculated from the two types of light source chromaticity coordinates x and y and one required chromaticity coordinate x1 and y1 using the determinant shown in Formula 5. Is performed (step S3).
[0040]
  Subsequently, collation processing between the calculated coefficients a to d and the table data in the registered data storage unit 31 is executed by the search means 22 (step S5). This collation processing is first executed from searching for a group belonging to the same category as the target LED. Since the light source chromaticity information x and y of the target LED are input, this information (there are two types of light source chromaticity information, so the average value of the two may be adopted) and each group's information This is done by comparing the chromaticity information of the LED. Basically, search for the one where the difference in chromaticity value is adopted.IfGood. Or if the range of chromaticity of LED of each group is registered, the group of the chromaticity range in which the chromaticity of LED of object is included may be searched.
[0041]
  When the identification of the group is completed, a search process based on coefficient matching is then performed on the tables in the group. First, it is searched whether or not there is a perfect match between coefficients (up to a predetermined digit) (step S7). If there is a perfect match, the type, composition ratio, and weight of the fluorescent material corresponding to the coefficients ad. Material specifying information regarding the part is extracted (step S9). On the other hand, when there is no perfect coincidence coefficient (NO in step S7), the coefficients a to d closest to the calculated coefficients a to d are displayed.InspectionSearching (step S11), the type, composition ratio and weight part material specifying information of the fluorescent material corresponding to the searched coefficients a to d are extracted (step S13). For identifying the closest coefficients a to d, for example, the one having the smallest difference between the corresponding coefficients may be extracted, or another suitable method may be adopted.
[0042]
Thereafter, the predicted chromaticity coordinates (x1, y1) are calculated from the light source chromaticity coordinates (x, y) and the specified coefficients a to d, and if necessary, the calculation result of the predicted chromaticity is transmitted to the customer. The customer's approval (manufacturing order) is obtained for the specified material and predicted chromaticity coordinates. In step S7, when the coefficients a to d coincide with the coefficients in the table in the registered data storage unit 31, the requested chromaticity coordinates and the predicted chromaticity coordinates completely coincide.
[0043]
Thereafter, the LED shape data and the like are obtained to start manufacturing. As a manufacturing method, for example, each constituent material that satisfies the extracted phosphor condition data is weighed in a stoichiometric ratio, mixed in ethanol, dried, and calcined in a crucible at 1500 ° C. A phosphor can be manufactured. Further, a filter material is manufactured by mixing the phosphor in a specified amount by weight with a silicone rubber material as a base material. The filter material is obtained by injecting the filter material into the filter mold and molding it using a heating press, thereby obtaining a light emission color having a uniform chromaticity coordinate desired by the customer. Therefore, even if the actual LED is received or not received (in this case, only the manufactured filter needs to be delivered to the customer), it can be manufactured independently, and an order can be taken with a shorter delivery time. And manufacturing and delivery will be possible.
[0044]
With the above configuration, it is possible to automatically and quickly obtain the phosphor material specific information for obtaining the light emission color having the uniform required chromaticity coordinates requested by the customer through the filter, and based on the phosphor condition data. The filter optimal for the target LED can be quickly manufactured.
[0045]
  In addition, the LEDs covered by the filter cover different color tones.RuEven if the same requested chromaticity coordinates are presented for such a customer's manufacturing request, the same processing procedure as described above is performed on the LED for each section, and the material for each section In this way, it is possible to manufacture filters that substantially coincide as emission chromaticity coordinates after coating over different sections in a short time.
[0046]
Here, it is specifically verified that there is no difference between the predicted chromaticity coordinates and the actually measured chromaticity coordinates.
[0047]
First, the type and composition ratio of the fluorescent material activated with cerium (Ce) is Y_1.8Gd_1.2Al_FiveO₁₂The YAG phosphor was added to silicone rubber in an addition amount (concentration) of 23 parts by weight, and a filter having a thickness of 0.35 mm was molded using a filter die and a heating press. In this case, the composition ratio of the YAG phosphor is Y: Gd: Al = 1.8: 1.2: 5. It is known from the experimental data that the coefficients (coefficients) a to d of this filter are a = 1.656, b = 0.880, c = 1.151, and d = 1.824.
[0048]
Next, four types of blue LEDs whose emission wavelength peak values are 466 nm, 468 nm, 470 nm, and 472 nm are respectively lit at an energization current of 20 mA, and the emission wavelength spectral radiance meter (PR-704 Photo Research Co., Ltd.) is placed at a predetermined distance. The chromaticity was measured. Here, 23 parts by weight of the YAG phosphor was mixed by substituting the chromaticity coordinates (x, y) of the emission color of the obtained blue LED and the values of the coefficients a to d into the determinant of Formula 5. The chromaticity coordinates of the emission color when the filter is covered and turned on are predicted. On the other hand, the actually measured chromaticity coordinates (x11, y11) were measured in the same manner as when the chromaticity coordinates (x, y) of the emission color of the blue LED were measured. The comparison results comparing these are shown in Table 2 below.
[0049]
[Table 2]
[0050]
In Table 2 above, there was almost no difference between the predicted chromaticity coordinates and the actually measured chromaticity coordinates. That is, the order in which the chromaticity can be identified by the human eye is 0.01 or more, but the predicted value and the actual measurement value of the chromaticity coordinates are on the order of about 0.001 for both the x value and the y value. It was an indistinguishable difference. Therefore, it has been found that the actual measurement value of the chromaticity coordinates can be sufficiently predicted from the predicted chromaticity coordinates.
[0051]
In addition, the types and composition ratios of the YAG fluorescent materials are the same, and when the parts by weight are sequentially changed to 15 parts by weight and 12 parts by weight, the results are as shown in Tables 3 and 4 below. There was no difference between the predicted chromaticity coordinates and the measured chromaticity coordinates.
[0052]
[Table 3]
[0053]
[Table 4]
[0054]
  Note that the coefficients a to d of the filter are a = 1.517, b = 0.422, c = 0.890, d = 1.337 based on experimental data when 15 parts by weight are mixed.12When the parts by weight were mixed, a = 1.482, b = 0.239, c = 0.794, and d = 1.159 from the experimental data.
[0055]
Therefore, according to Tables 2 to 4, even when the weight parts of the phosphors are different, the chromaticity coordinates of the luminescent color can be easily and at a level close to the measured value of the chromaticity coordinates of the luminescent color (a level within the visual identification range). We were able to predict accurately. Although not shown here, as in the case of parts by weight, a level close to the actual measurement value of the chromaticity coordinates of the emission color (a level within the visual identification range) even when the type and composition ratio of the phosphor are different. It was found that the chromaticity coordinates of the luminescent color can be predicted easily and accurately.
[0056]
From this, the predicted chromaticity coordinates and the actually measured chromaticity coordinates are substantially equal, so the light source chromaticity coordinates and the required chromaticity coordinate data of the blue LED are obtained from the customer's communication terminal device, and the coefficients a˜ If d is known, the chromaticity coordinates of the emission color when the blue LED is covered with a filter containing a predetermined phosphor and turned on can be calculated easily using Equation (5). It will be predictable.
[0057]
In the above embodiment, the calculation means 21 calculates the coefficients a to d from the light source chromaticity coordinates x and y of the LED and the required chromaticity coordinates x1 and y1 of the emission color obtained by attaching a filter to the LED. The search means 22 searches for the coincidence or substantially coincidence of the calculated coefficients a to d and the table data coefficients a to d of Table 1, and from the coincidence or substantially coincidence of the table data coefficients a to d, The type (for example, YAG phosphor), the composition ratio, and the weight part are automatically searched, but the matching search processing with the coefficients a to d of the table data and the fluorescent material corresponding to the matching coefficients a to d The type, composition ratio, and weight part search process may be performed by an operator's operation. Further, the table data as shown in Table 1 may be printed paper data. Using the table of paper data, a match search with the coefficients a to d of the table, or the coefficients a to d of the matching table are performed. You may make it perform the search of the kind of fluorescent raw material corresponding, a composition ratio, and a weight part visually.
[0058]
  In the above embodiment, the case of obtaining a desired uniform chromaticity has been described. However, the present invention is not limited to this, and color (tone) adjustment including luminance adjustment may be performed in addition to chromaticity adjustment. In this case, the search means 22 selects from a plurality of types of phosphors having different relative light emission intensities (luminances), or selects a composite phosphor material in which a plurality of phosphor materials are combined, so that substantially the same desired The brightness value will beSea urchindo it. Preferably, in the same type as the type of the selected fluorescent material, the type, composition ratio, and part by weight of the fluorescent material corresponding to the coefficients a to d that match in the matching result may be extracted. For example, Y described later_1.8GD_1.2Al_FiveO₁₂, Y_2.4Gd_0.6Al_FiveO₁₂, Y_ThreeAl_FiveO₁₂When a fluorescent coating (type of phosphor) is manufactured using the above, linear interpolation calculation is performed from the relative emission intensities 100, 86 and 89 at the respective main emission wavelengths so as to obtain the luminance required by the customer. The distribution amount can be adjusted and set.
[0059]
  Furthermore, although the filter as the LED light-transmitting coating material has been described as a cap, the present invention is not limited to this, and a sheet shape that covers the LED may be used. To form a translucent coating material into a sheet shape,Body andWhat is necessary is just to melt-knead the binder resin and adopt an inflation method, a T-type die method, a solution casting method, a calendar method, or the like.
[0060]
In this embodiment, chromaticity is adopted as the color system. However, the present invention is not limited to this, and the object of the present invention can be substantially achieved by using other color systems.
[0061]
In addition to the GaN blue LED, various LEDs can be used as the LED used for the light source. Specifically, for example, Ga: ZnO red LED, GaAsP red LED, GaAsP orange / yellow LED, GaP : N green LED, SiC blue LED, II-VI group blue LED (for example, LED using ZnSe as a light emitting material; emission wavelength 464 nm). Among these, since the emission wavelength of the blue LED is the shortest and the energy is high, since the phosphor can be excited more effectively, there is an advantage that the luminance can be increased. Subsequently, a green LED, an orange / yellow LED, and a red LED are preferable in this order. Moreover, any form may be sufficient as LED, for example, LED lamp, chip type LED, segment type LED etc. can be used conveniently. The light emitting element may be a light emitting diode or a semiconductor light emitting element.
[0062]
Moreover, as a luminescent substance to be used, Y_1.8GD_1.2Al_FiveO₁₂, Y_2.4Gd_0.6Al_FiveO₁₂, Y_ThreeAl_FiveO₁₂In addition to cerium, a wide variety of fluorescent materials such as so-called phosphors, luminescent pigments, and luminescent dyes can be used as activators. Examples of organic phosphors include allylsulfoamide / melamine formaldehyde co-condensation dyes and perylene phosphors. Examples of inorganic phosphors include aluminate, phosphate, and silicic acid. A salt etc. can be mentioned. Among these, perylene-based phosphors and yttrium aluminate are particularly preferable from the viewpoint that they can be used for a long time and emit light efficiently. Furthermore, examples of the activator added to the phosphor include elements such as cerium, europium, manganese, gadolinium, samarium, terbium, tin, and chromium. Of these, cerium is preferred. As a combination of the base crystal and the activator, a combination of yttrium aluminate (YAG phosphor) and cerium is preferable, and the YAG phosphor can emit light efficiently.
[0063]
In addition to silicone rubber, the resin used in combination with the luminescent material is, for example, acrylic resin, polycarbonate resin, polystyrene resin, polyester resin, epoxy resin, polypropylene resin, polyethylene resin, silicone elastomer, polyolefin elastomer, polyurethane. Resins such as thermoplastic elastomers can be used. Of these, silicone elastomers are preferably used. The silicone rubber used in this embodiment belongs to a silicone elastomer.
(Example)
GaN-based blue LEDs 12a and 12b (E1L33-3B manufactured by Toyoda Gosei) are turned on at 20 mA, measured with a spectral radiance meter (PR-704 Photo Research) at a predetermined distance, and emission wavelengths of 472 nm and 464 nm. Got. The blue LED 12a with an emission wavelength of 472 nm has x = 0.1226, y = 0.1069 in chromaticity coordinates, and a luminance of 30.45 cd / m.²Met. The blue LED 12b having an emission wavelength of 464 nm has chromaticity coordinates of x = 0.1369, y = 0.0611, and a luminance of 25.54 cd / m.²Met. Comparing the two, there is a difference of 0.043 in the x value of the chromaticity coordinates and 0.0458 in the y value, and there is a difference of 0.01 or more in both the x and y values. (For example, the different divisions described above) and the luminance is 4.91 cd / m²There was a difference.
[0064]
Filter 11a is Y activated by cerium (Ce)_1.8Gd_1.2Al_FiveO₂The YAG phosphor was mixed with 23 parts by weight of a silicone rubber material as a binder resin, and molded using a filter mold and a heating press. The thickness of the filter 11a was 0.35 mm.
[0065]
This filter 11a was attached to each of the blue LEDs 12a and 12b, turned on with an energization current of 20 mA, and measured with an emission wavelength spectral radiance meter (PR-704 Photo Research) at a predetermined distance. Table 5 shows chromaticity coordinates and luminance values at this time.
[0066]
[Table 5]
[0067]
In Table 5, the difference in the x value is 0.01 or less, which is a difference that is indistinguishable to the human eye and can be ignored, but the difference in the y value is 0.01 or more and is apparent to the human eye. Could be identified.
[0068]
On the other hand, from Table 5, if the emission wavelength peak value and chromaticity of the blue LEDs 12a and 12b are different, even if the same filter 11a is coated on the blue LEDs 12a and 12b, uniform chromaticity and luminance may not be obtained. understood. The brightness of the blue LED 12a is 30.45 cd / m by interposing the filter 11a.²To 68.7 cd / m²In addition, the blue LED 12b is 25.54 cd / m²To 84.8 cd / m²It turned out that both rose.
[0069]
Furthermore, Y is a phosphor activated with cerium (Ce)_2.4Gd_0.6Al_FiveO₁₂And Y_ThreeAl_FiveO₁₂Was mixed at a ratio of 3: 2 and 18 parts by weight was added to the silicone rubber, and a filter 11b having a thickness of 0.35 mm was formed by using a filter mold and a heating press. The filter 11b is attached to a blue LED 12b having a light emission peak of 464 nm among the blue LEDs 12a and 12b, and is lit at an energization current of 20 mA, and a light emission wavelength spectral radiance meter (manufactured by PR-704 Photo Research) at a predetermined distance. Measured with Table 6 shows chromaticity coordinates and luminance values of the filter 11b at this time.
[0070]
[Table 6]
[0071]
In FIG. 4 which graphs the contents of Tables 5 and 6, the chromaticity coordinate A is a chromaticity coordinate obtained by coating the filter 11a on the blue LED 12a whose emission wavelength peak is 472 nm, and the chromaticity coordinate B is The blue LED 12b having an emission wavelength peak of 464 nm has a phosphor (Y_1.8Gd_1.2Al_FiveO₁₂) Is a chromaticity coordinate obtained by covering the filter 11a with an addition amount of 23 parts by weight, and the chromaticity coordinate C is a chromaticity coordinate obtained by covering the blue LED 12b with the filter 11b. It was found that the chromaticity coordinates A and chromaticity coordinates C are very close tones (chromaticity and luminance), and can hardly be visually identified (belonging to the same category). By changing the filter 11a from the filter 11a to the filter 11b for the same blue LED 12b, the chromaticity coordinate and the luminance value are changed from the chromaticity coordinate B to the chromaticity coordinate C in FIG.
[0072]
Therefore, even when the blue LEDs 12a and 12b having different emission characteristics (emission wavelength peaks) are used, phosphor materials with different types, composition ratios (Gd composition amounts) and addition amounts (concentrations) of phosphors to be used are used. It was confirmed that uniform color tone (chromaticity and luminance) can be obtained by changing the emission chromaticity and emission intensity (luminance) by using the filters 11a and 11b formed by using the filters.
[0073]
Here, the phosphor used is Y₂O_Three, Gd_1.2O_Three, Al₂O_Three, CeO₂Was weighed to a stoichiometric ratio, mixed in ethanol, dried, and fired at 1500 degrees Celsius in a crucible. In general, Gd₂O_ThreeThe emission intensity at the main emission wavelength of the phosphor decreased as the amount of addition increased. Here, contrary to that, in order to adjust the brightness, Y_1.8Gd_1.2Al_FiveO₁₂, Y_2.4Gd_0.6Al_FiveO₁₂, Y_ThreeAl_FiveO₁₂The luminance values were adjusted using phosphors having relative emission intensities of 100, 86, and 89 at the main emission wavelength as a whole.
[0074]
As described above, even if the colors are different as in the LEDs 12a and 12b, the types of phosphors (Y_1.8Gd_1.2Al_FiveO₁₂), A filter 11a using a phosphor having a composition ratio (Y: Gd: Al = 1.8: 1.2: 5) and an addition amount (23 parts by weight) is attached to one LED 12a, and , Type of fluorescent material (body) contained (Y_2.4Gd_0.6Al_FiveO₁₂And Y_ThreeAl_FiveO₁₂), Composition ratio (Y: Gd: Al = 2.4: 0.6: 5, Y: Al = 3: 5 mixing ratio 3: 2) and added amount (18 parts by weight) of phosphor By attaching the filter 11b using the LED 11b to the other LED 12b, it is possible to obtain a uniform color tone having substantially the same chromaticity coordinates and brightness, and it is necessary to perform a sorting operation (sorting operation) for each color tone range that has been conventionally performed Therefore, it can be inexpensive with good yield.
[0075]
【The invention's effect】
According to the present invention, if a phosphor is specified prior to arrival of a light-emitting element and the element shape, dimensions, and the like are available, a phosphor coating material using the specified phosphor can be rapidly manufactured. Further, a desired more uniform color tone can be obtained between the light emitting elements having different color tones through the phosphor coating material.
[0076]
Moreover, the desired phosphor material can be specified quickly and accurately by using the mathematical formula.
[0077]
Further, since the predicted color information can be transmitted to the customer via the data communication means, it is possible to easily determine the manufacturing approval even if there is no actual product, which can contribute to the speeding up of the manufacturing.
[0078]
  further,lightSubstantially the same required color information can be obtained by interposing this covering for light emitting elements having different source colors.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a control configuration in an embodiment of a fluorescent coating production support system according to the present invention.
FIG. 2 is a longitudinal sectional view showing a configuration of a filter manufactured using the fluorescent coating manufacturing support system of FIG.
FIG. 3 is a flowchart showing an example of operation in the fluorescent coating production support system of FIG. 1;
FIG. 4 is a diagram showing chromaticity coordinates and luminance obtained by each phosphor in an example.
FIG. 5 is a diagram showing variations in chromaticity coordinates in an arbitrary blue LED.
FIG. 6 is a diagram showing variations in chromaticity coordinates in a plurality of white LEDs.
7 is a diagram illustrating variations in luminance values with respect to chromaticity coordinates (x values) in FIG. 6; FIG.
[Explanation of symbols]
1 Fluorescent coating production support system
2 CPU
21 computing means (first computing means, second computing means)
22 Search means
3 ROM
31 Registered data storage
4 RAM
5 display section
6 Input section
7 Transmitter / receiver (data communication means)
11, 11a, 11b filter
12, 12a, 12b Blue LED

Claims (8)

In accordance with the following relational expression, the CIE standard color system chromaticity coordinates (x, y) of the light source color of the light emitting element and the CIE of the required light emitting color obtained by converting the light source color by covering the light emitting element with a fluorescent coating. The relationship with the standard color system chromaticity coordinates (x1, y1) is related through the coefficients a to d related to the phosphor material included in the phosphor coating, and the light source color of the specific light emitting element is described above. The coefficients a to d are obtained from the chromaticity coordinates (x, y) and the chromaticity coordinates (x1, y1) of the required emission color , and the phosphor material to be included in the fluorescent coating is specified from the obtained coefficients a to d. A method for supporting the production of a fluorescent coating, comprising:
Where x, y: CIE standard color system chromaticity coordinates of light source color of light emitting element
x1, y1: CIE standard color system chromaticity coordinates of required emission color obtained by covering the light emitting element with a fluorescent coating Information for specifying the phosphor material is recorded in a table format in association with the coefficients a to d, and the phosphor material specifying information suitable for the obtained coefficients a to d is read from the table and notified. The method for supporting the production of a fluorescent coating according to claim 1. The phosphor material, the kind of fluorescent material, composition ratio, and a fluorescent coating material production supporting method according to claim 1 or 2, characterized in that identified by the mixing ratio to the substrate. In accordance with the following relational expression, the CIE standard color system chromaticity coordinates (x, y) of the light source color of the light emitting element and the CIE of the required light emitting color obtained by converting the light source color by covering the light emitting element with a fluorescent coating. Storage means for storing the relationship with the standard color system chromaticity coordinates (x1, y1) via coefficients a to d related to the phosphor material included in the phosphor coating, and a specific light emitting element First calculation means for obtaining the coefficients a to d from the chromaticity coordinates (x, y) of the light source color and the chromaticity coordinates (x1, y1) of the required emission color, and fluorescence from the obtained coefficients a to d. A fluorescent coating manufacturing support system comprising: search means for extracting information for specifying a phosphor material to be included in a coating.
Where x, y: CIE standard color system chromaticity coordinates of light source color of light emitting element
x1, y1: CIE standard color system chromaticity coordinates of required emission color obtained by covering the light emitting element with a fluorescent coating The storage means stores information specifying the phosphor material in a table format in association with the coefficients a to d, and the search means conforms to the coefficients a to d obtained by the first calculation means. 5. The fluorescent coating production support system according to claim 4, wherein the fluorescent material specifying information to be extracted is extracted from the table . 6. The phosphor coated body according to claim 4 or 5 , wherein the storage means stores the phosphor material as information specifying the kind of the fluorescent material, the composition ratio, and the mixing ratio with respect to the base material. Support system. Data communication means capable of receiving CIE standard color system chromaticity coordinates (x, y) of the light source color of the light emitting element and CIE standard color system chromaticity coordinates (x1, y1) of the required light emission color from an external terminal. fluorescent jacket manufacture support system according to any one of claims 4-6, characterized in that the. A second calculation for obtaining a CIE standard color system chromaticity coordinate of a predicted emission color determined from the extracted phosphor material specifying information and the CIE standard color system chromaticity coordinate (x, y) of the light source color of the light emitting element. 8. The fluorescent covering production support system according to claim 7 , further comprising: a data communication unit configured to transmit CIE standard color system chromaticity coordinates of the predicted emission color to the external terminal .