JP2008098687A - Trancelucent covering material for light-emitting diode, and color light source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trancelucent covering material for a light-emitting diode capable of inexpensively changing and controlling the primary wavelength of an LED into a desired range, and also adjusting the luminance. <P>SOLUTION: The trancelucent covering material for the LED contains a dyestuff or a pigment having different absorption factors to beams from the light-emitting diode on the long wavelength side and the short wavelength side in a wavelength region emitted from the light-emitting diode,in the light-transmitting covering material mounted on the light-emitting diode. A color light source installed with the light-transmitting covering material for the diode. Thus primary wavelengths of various LEDs are easily and surely controlled, and further the luminance is also controlled. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light-transmitting coating material for a light emitting diode (hereinafter referred to as LED) and a color light source. More specifically, the main wavelength (peak emission wavelength) of an LED can be easily and reliably shifted, for example, a red LED. For example, the light-transmitting coating material for LED, which can finely adjust the color tone in the luminescent color of red, and can also adjust the luminance at the same time, and the light-transmitting coating material for LED are applied to the LED. The present invention relates to a color light source in which a desired emission color and brightness can be obtained by mounting, by controlling the intrinsic main wavelength and luminance of the LED by the dye and pigment in the covering material.

  LEDs are marketed as products in which the luminance and the dominant wavelength are controlled to some extent. However, it is actually difficult to produce a uniform LED when producing LEDs, and there are variations in the dominant wavelength and luminance. Inevitably occurs. How to reduce such variation is a very important issue in terms of cost, but it has not yet been able to sufficiently suppress variation, and at present, it has sufficient accuracy to meet the required accuracy of the market. It's hard to say. For example, in the case of a red LED, the color tone is said to be the limit of production with a target main wavelength of about ± 20 nm.

  On the other hand, in the market, there is a demand for the accuracy of the main wavelength in a range narrower than ± 20 nm, and in the severe one, there is a demand for accuracy that the variation of the main wavelength is about ± 5 nm. Therefore, when such accuracy is required, the current situation is that the LEDs are mass-produced for the target main wavelength and are selected and sorted.

  In addition, the target main wavelength is not consistent with the market in all cases, and the target main wavelength itself may be changed. For example, in the case of a red LED, the target main wavelength is usually 625 nm. However, when a product with a target main wavelength of 635 nm is requested, the LED is handled by specially selecting and sorting LEDs in the designated main wavelength region. Of course, the more severe the sorting from the produced LEDs, the more expensive the price of the required LED will be due to a reduction in the sorting yield.

  Further, the luminance has to be controlled according to the demand from the market. The LED luminance control method is often electrically controlled by a luminance adjustment circuit, which complicates the circuit. For example, JP 2000-340842 A has also been proposed as a method of using an IC.

  As another control method, a filter in which only a light shielding material is mixed in a transparent resin has been used. All of these conventional methods only adjust the brightness.

  The present invention has been researched and developed to solve the various problems as described above, and can easily and inexpensively change the dominant wavelength of the LED to a desired range and control it. Another object of the present invention is to provide a translucent covering material for a light emitting diode, which can also adjust the luminance at the same time.

  Furthermore, another object of the present invention is to provide a color light source that emits light at a desired main wavelength and luminance by controlling the intrinsic main wavelength and luminance of the LED by the light-transmitting diode light-emitting diode.

  As a result of intensive studies to solve the above problems, the present inventor has obtained dyes or pigments having different absorption rates for light from the light emitting diodes in the long wavelength region and the short wavelength region in the wavelength region where the LED emits light. Translucent coating material to be contained, that is, as a first type, a dye having a spectral transmittance curve in which the spectral transmittance on the long wavelength side is higher than the spectral transmittance on the short wavelength side in the wavelength region where the LED emits light When the LED is covered with a light-transmitting coating material containing a pigment, the light in the wavelength region emitted from the LED is absorbed. At this time, the light is emitted in a region shorter than the long wavelength side of the wavelength region. The main wavelength of the LED can be shifted to the longer wavelength side because it is absorbed more, and as a second type, the spectral transmittance on the short wavelength side is the spectral transmittance on the long wavelength side in the wavelength region. Yo When the LED is covered with a light-transmitting coating material containing a dye or pigment having a high spectral transmittance curve, the light on the long wavelength side is absorbed more than the short wavelength side in the wavelength region. The present inventors have found that the wavelength can be shifted to the short wavelength side, and that the luminance can be adjusted with both types of translucent coating materials, and the present invention has been made.

  That is, the present invention is (1) a light-transmitting coating material to be attached to a light-emitting diode, and in the wavelength region where the light-emitting diode emits light, the absorptance with respect to the light from the light-emitting diode A light-emitting diode transmission comprising a dye or a pigment having a spectral transmittance curve that is different in the side region and has a difference between the minimum spectral transmittance and the maximum spectral transmittance in the wavelength region of 30% or more. A color light source comprising: a light-emitting coating material; and (2) a light-emitting diode light-transmitting coating material described in (1) above is mounted on the light-emitting diode.

Here, as a translucent coating material for a light emitting diode containing a dye or pigment that absorbs light on the short wavelength side more than on the long wavelength side, the spectral transmittance on the long wavelength side is higher than the spectral transmittance on the short wavelength side. Are preferably those containing the dye or pigment having a high spectral transmittance curve, and in the wavelength region where the light emitting diode emits light, the spectral transmittance (τ ₁ ) with respect to the longest wavelength of the wavelength region is 70% or more. And having a spectral transmittance curve in which the difference (τ ₁ −τ ₂ ) from the spectral transmittance (τ ₂ ) with respect to the shortest wavelength in the wavelength region is 30% or more is more preferable, Is the wavelength range where the dye or pigment emits light from the light emitting diode; (A) shows the maximum spectral transmittance between the longest wavelength and the dominant wavelength in the wavelength range; and (B) the shortest wavelength in the wavelength range. Spectral transmittance curve having at least one of the conditions (A) and (B) indicating a minimum spectral transmittance between the main wavelengths, more preferably bent in the vicinity of the main wavelength of the light emitting diode. It is further preferable to have a spectral transmittance curve.

On the other hand, as a light-transmitting coating material for a light-emitting diode containing a dye or pigment that absorbs light on the long wavelength side more than the short wavelength side, the spectral transmittance on the short wavelength side in the wavelength region where the light-emitting diode emits light Are preferably those containing the above dye or pigment having a spectral transmittance curve higher than the spectral transmittance on the long wavelength side, and the spectral transmittance (τ ₃ ) for the shortest wavelength in the wavelength region is 70% or more. , and the spectral transmittance curve difference between the spectral transmittance (tau ₄₎ for the longest wavelength (τ ₃ -τ ₄₎ is 30% or more of the above wavelength region, preferably, the dye or pigment is, the light emitting diode In the wavelength region to emit light, (C) shows the maximum spectral transmittance between the shortest wavelength and the dominant wavelength in the wavelength region, (D) shows the minimum spectral transmittance between the longest wavelength and the dominant wavelength in the wavelength region, When those having a spectral transmittance curve comprising at least one of the condition of the conditional (C) and (D) referred to, it is more preferable. The translucent covering material for light emitting diodes of the present invention is more preferable if it contains 0.01 to 2% by mass of the dye or pigment.

  Moreover, the light-transmitting coating material for light-emitting diodes of the present invention further contains a dye or pigment having a spectral transmittance curve in which the spectral transmittance hardly changes in the wavelength region where the light-emitting diode emits light, if necessary. The blending amount of such a dye or pigment is preferably 0.01 to 2% by mass. Furthermore, it is more preferable that the light-transmitting coating material for light-emitting diodes of the present invention is formed of a silicone-based elastomer in which the above dye or pigment is uniformly dispersed and contained. A sheet shape is preferred.

  As described above, according to the present invention, the dominant wavelength of various LEDs can be controlled easily and reliably. For example, red LED is red, orange LED is orange, blue LED is blue, green LED. If so, it is possible to finely adjust the color tone in the green emission color, and it is also possible to control the luminance at the same time. Therefore, the light-transmitting coating material of the present invention can be a color light source in which the main wavelength and luminance of the LED are controlled easily and reliably only by being attached to the LED. The color light source of the present invention adjusted to a desired dominant wavelength and brightness by the translucent coating material of the present invention is used for purposes such as turn signals such as automobiles, audio equipment displays, numerical displays, lamps, etc. It is particularly useful as a color light source in a field where adjustment accuracy of the main wavelength and brightness is required.

  Hereinafter, the present invention will be described in more detail. The translucent coating material for light emitting diodes of the present invention has an absorptance with respect to light rays from the light emitting diodes in the wavelength region where the light emitting diodes to be mounted in the coating materials emit light. Is different between the long wavelength side region and the short wavelength side region, and the difference between the minimum spectral transmittance and the maximum spectral transmittance in the wavelength region is 30% or more, preferably 45% or more. That is, it contains a dye or pigment having a specific spectral transmittance curve in the above wavelength region. Therefore, according to the translucent covering material for a light emitting diode of the present invention, it is not necessary to strictly select LEDs as in the prior art, a complicated circuit incorporating an IC is not required, a filter is not required, and an LED is simply used. A color light source having a desired dominant wavelength and brightness can be easily obtained simply by coating the coating material.

  As described above, the dye or pigment contained in the light-transmitting diode light-transmitting coating material of the present invention has a short wavelength absorption region and a short wavelength region in the wavelength region where the LED to be mounted emits light. It is a colored dye or colored pigment that differs in the wavelength side region. Here, in the present invention, the “wavelength region where the LED emits light” is a characteristic value of each LED, and is usually a range defined for each product, specifically called a red LED. For example, 580-680 nm, if it is a product called an orange LED, for example, 550-650 nm, if it is a product called a blue LED, for example, 420-520 nm, called a green LED If it is a product, the thing of 470-570 nm is used widely, for example. Note that this characteristic value is an example, and the above value varies slightly depending on the manufacturer, product number, and the like. The fluctuation width is usually about the above value ± 30 nm, and particularly about the above value ± 10 nm.

As the dye or pigment, the first type is a dye or pigment that absorbs more light on the short wavelength side than on the long wavelength side. A dye or pigment having a spectral transmittance curve higher than the transmittance is suitable. Specifically, the spectral transmittance (τ ₁ ) with respect to the longest wavelength in the wavelength region is 70% or more, preferably 80% or more, and more. Preferably, it is 85% or more, and the difference (τ ₁ −τ ₂ ) from the spectral transmittance (τ ₂ ) with respect to the shortest wavelength in the wavelength region is 30% or more, preferably 45% or more, more preferably 60% or more. It is more preferable that it has a spectral transmittance curve. If τ ₁ is too small, it may be difficult to adjust the brightness of the LED. If τ ₁ −τ ₂ is too small, the absorption ratio of light on the short wavelength side may be low, and it may be difficult to shift the dominant wavelength. is there.

In addition, it is more preferable that the dye or pigment has a spectral transmittance curve having at least one of the following conditions (A) and (B) in the wavelength region where the light emitting diode emits light. Of these, dyes or pigments having a spectral transmittance curve satisfying both of the following conditions (A) and (B) are more preferred.
(A) The maximum spectral transmittance is shown between the longest wavelength and the dominant wavelength in the wavelength region. (B) The minimum spectral transmittance is shown between the shortest wavelength and the dominant wavelength in the wavelength region.

  Here, the spectral transmittance curve further shows (a) a maximum spectral transmittance in the longest wavelength in the wavelength region or in the vicinity thereof, and (b) a minimum spectral transmittance in the shortest wavelength in the wavelength region or in the vicinity thereof. It is more preferable that at least one of the conditions (a) and (b) is satisfied. More specifically, the longest wavelength or the vicinity thereof includes the longest wavelength to the longest wavelength. The range between −50 nm and particularly −20 nm is preferable, and the shortest wavelength or its vicinity is preferably from the shortest wavelength to the shortest wavelength +50 nm, particularly +20 nm. It is most preferable that the maximum spectral transmittance is shown at the longest wavelength and the minimum spectral transmittance is shown at the shortest wavelength. Moreover, the said dye or pigment has a spectral transmittance curve as shown in FIG. 1 bent in the vicinity of the dominant wavelength of the LED to be mounted, like the pigment used in Examples 1 to 3 described later. Fine adjustment of the shift of the main wavelength and fine adjustment of the brightness become easier.

  More specifically, examples of the first type dye or pigment include quinacridone pigments, anthraquinone dyes, diketopyrrolopyrrole pigments, phthalocyanine pigments, and the like. Two or more species can be used in appropriate combination. More specifically, for example, if the LED to be mounted is a red LED, a quinacridone such as Pigment Violet 19 (C. I. Generic Name) such as CINQUASIA Violet (Sincacia Violet) R RT-891-D (trade name). If it is an orange LED such as a reddish purple pigment such as an anthraquinone reddish purple dye such as Disperse Violet 57 such as FILESTER Violet BA (trade name), a diketo such as Pigment Orange 71 If it is a blue LED, such as an orange colorant such as a pyrrolopyrrole-based orange pigment, or a blue colorant such as a copper phthalocyanine-based blue pigment such as Pigment Blue 15.2 or the like, if it is a green LED, a halo such as Pigment Green 7 Green colorants such as copper phthalocyanine-based green pigments, etc., which are used depending on the target main wavelength and the main wavelength of the LED to be mounted, the relationship between the target luminance and the luminance of the LED to be mounted (conversion amount), etc. A dye or a pigment can be appropriately selected.

As the second type dye or pigment that absorbs light in the longer wavelength region than in the shorter wavelength region, the spectral transmittance on the shorter wavelength side is higher than the light transmittance on the longer wavelength side in the above wavelength region. A dye or pigment having a spectral transmittance curve is suitable. Specifically, the spectral transmittance (τ ₃ ) with respect to the shortest wavelength in the wavelength region is 70% or more, preferably 80% or more, more preferably 85% or more. And the difference (τ ₃ −τ ₄ ) from the spectral transmittance (τ ₄ ) with respect to the longest wavelength in the wavelength region is 30% or more, preferably 40% or more, more preferably 45% or more. More preferably, it has a curve. If τ ₃ is too small, it may be difficult to adjust the brightness of the LED. If τ ₃ -τ ₄ is too small, the absorption ratio of light on the long wavelength side may be low, and it may be difficult to shift the dominant wavelength. is there.

Further, it is more preferable that the dye or pigment has a spectral transmittance curve having at least one of the following conditions (C) and (D) in the wavelength region where the light emitting diode emits light. Among these, a dye or pigment having a spectral transmittance curve satisfying both conditions (C) and (D) below is more preferable.
(C) The maximum spectral transmittance is shown between the shortest wavelength and the dominant wavelength in the wavelength region. (D) The minimum spectral transmittance is shown between the longest wavelength and the dominant wavelength in the wavelength region.

  Here, also in the spectral transmittance curve of the second type, the spectral transmittance curve further shows (c) the maximum spectral transmittance in the shortest wavelength in the wavelength region or in the vicinity thereof, (d) It is more preferable to satisfy at least one of the conditions (c) and (d) in which the longest wavelength in the wavelength range or the minimum spectral transmittance is displayed in the vicinity thereof. The wavelength or the vicinity thereof is preferably between the shortest wavelength +50 nm, particularly +20 nm, and the longest wavelength or the vicinity thereof is preferably between the longest wavelength −50 nm, particularly −20 nm. It is most preferable that the maximum spectral transmittance is shown at the shortest wavelength and the minimum spectral transmittance is shown at the longest wavelength.

  More specifically, examples of the second type dye or pigment include anthraquinone dyes, phthalocyanine pigments, ultramarine pigments, and the like. These may be used alone or in combination of two or more. can do. More specifically, for example, when the LED to be mounted is an orange LED, a halogenated copper phthalocyanine-based green pigment such as Pigment Green 7 (CI Generic Name) such as IRGALITE (Irgarite) Green GFNP (trade name) For blue LEDs such as green colorants such as Anthraquinone blue dyes such as Solvent Blue 68, blue colorants such as ultramarine blue pigments such as Pigment Blue 29, for example, Pigment Blue 15 Blue colorants such as copper phthalocyanine-based blue pigments, etc., and dyes to be used depending on the target main wavelength and the main wavelength of the LED to be mounted, and the relationship (conversion amount) between the target luminance and the luminance of the LED to be mounted Or a pigment can be selected suitably.

  The blending amount of the dye or pigment in the coating material of the present invention is not particularly limited, and is appropriately selected depending on the main wavelength, the luminance conversion amount, the type of the dye or pigment, the kind of the translucent material, and the like. However, it is usually preferable to contain 0.01 to 2% by mass, preferably 0.1 to 1% by mass, and more preferably 0.2 to 0.5% by mass with respect to the total amount of the coating material. If the content of the dye or pigment in the coating material is too small or too large, the dominant wavelength and brightness may be difficult to control.

  The translucent coating material of the present invention can also contain components other than the above-mentioned dyes and pigments for controlling the main wavelength and luminance of the LED to be mounted. For example, in order to obtain a desired light beam, conversion of the main wavelength When it is necessary to make the luminance conversion rate relatively large as compared to the luminance rate, and further by including a dye or pigment having a spectral transmittance curve in which the spectral transmittance hardly changes in the wavelength region where the LED emits light, these However, it functions as a so-called light-shielding material, and the luminance can be adjusted by the blending amount without substantially changing the main wavelength of the LED to be mounted, so that it becomes easier to obtain a desired light beam.

Here, as the spectral transmittance curve in which the spectral transmittance hardly changes in the wavelength region where the LED emits light, for example, the maximum value (τ _max ) of the spectral transmittance in the wavelength region is 85% or less, and the wavelength A spectral transmittance curve in which the difference (τ _max −τ _min ) from the minimum value (τ _min ) of the spectral transmittance in the region is 20% or less, particularly 10% or less is more preferable. Note that the maximum value (τ _max ) of spectral transmittance and the minimum value (τ _min ) of spectral transmittance do not have to be for the longest wavelength and shortest wavelength in the above wavelength region.

  Specific examples of the dye or pigment functioning as a so-called light-shielding material include black colorants such as carbon black and white colorants such as titanium oxide, but are not limited thereto. Depending on the type of LED to be mounted, various dyes and pigments other than those described above can be selected. For example, if mounted on a blue LED, the spectral transmittance hardly changes in the wavelength region where the blue LED emits light. A red pigment or the like can also be blended. The dyes and pigments can be used singly or in appropriate combination of two or more.

  When the dye or pigment that functions as a so-called light shielding material is blended in the coating material of the present invention, the blending amount is not particularly limited and can be appropriately selected depending on the amount of luminance conversion, etc. It is preferable to contain 0.01 to 2% by mass, preferably 0.02 to 1% by mass, more preferably 0.03 to 0.5% by mass with respect to the total amount of the covering material. If the content is too low or too high, it may be difficult to control the luminance.

  The translucent coating material of the present invention comprises the above dye or pigment for controlling the main wavelength and luminance of the LED to be mounted, and the above dye or pigment that functions as a so-called light shielding material, if necessary, uniformly dispersed in the translucent resin. The above-mentioned translucent resin is not particularly limited, and examples thereof include acrylic resin, polycarbonate resin, polystyrene resin, polyester resin, epoxy resin, and silicone. Resins such as a thermoplastic elastomer and a polyolefin-based thermoplastic elastomer can be used, and among these, a silicone elastomer is particularly preferably used in consideration of heat resistance, light stability, and the like.

  The type of silicone elastomer is not particularly limited. Of the various products marketed as silicone rubber compounds from silicone manufacturers and distributors, dimethylpolysiloxane is compounded with silica as a reinforcing material. Good product can be selected and used. Specifically, for example, KE-951U (trade name), KE-550U (trade name) manufactured by Shin-Etsu Chemical Co., Ltd., SH-851U (trade name) manufactured by Toray Dow Corning Silicone Co., Ltd., GE Toshiba Silicone Co., Ltd. Examples thereof include TSE-221-5U (trade name) manufactured by the Company.

  When the silicone elastomer is used as the translucent resin, the silicone rubber compound is blended with the vulcanizing agent specified by the silicone manufacturing and sales company and the dye or pigment described above, and kneaded uniformly. Then, the translucent coating | covering material of this invention can be obtained by heat-molding so that it may become a desired shape.

  The shape of the covering material of the present invention is not particularly limited as long as it is a shape that can be attached to the LED, but it is preferable to adopt a cap shape or a sheet shape according to the type of the LED to be attached. In order to make the covering material into a cap shape, for example, melt-kneading so that the dye or pigment is uniformly dispersed and mixed in the translucent resin, inflation method, T-shaped die method, solution casting method, calendar method The method etc. which shape | mold according to the shape of LED to mount | wear by the etc. are mentioned.

  Moreover, in chip type LED and segment type LED, the sheet-like material containing the said dye and a pigment can be adhere | attached on the LED surface as needed, and it can be set as a coating layer. As a bonding method, a known method can be used, for example, thermal bonding, ultrasonic bonding, high-frequency bonding, glue bonding using an adhesive, or the like. Here, in order to improve adhesion, the surface of the sheet-like material may be subjected to surface treatment such as oxidation with a chemical, oxidation by exposure to a gas flame, or contact with a surface electrode to perform corona discharge.

  As the LED used in the present invention, any known LED can be used. For example, Ga: ZnO red LED, GaP: N green LED, GaAsP red LED, GaAsP amber / yellow LED, GaAlAs Examples include LEDs, InGaAlP-based orange / yellow LEDs, GaN-based blue LEDs, SiC blue LEDs, and II-VI group blue LEDs.

  Moreover, any form may be sufficient as LED, for example, LED lamp, chip type LED, segment type LED etc. can be used conveniently.

  In addition, the main wavelength by the translucent coating material for LED of the present invention, the amount of luminance conversion (adjustment amount) is not particularly limited, and can be appropriately adjusted depending on the content of the dye and pigment, Usually, it is preferable to use it to shift the main wavelength of the mounted LED to about 10 nm for the long wavelength side and to about 10 nm for the short wavelength side. It is suitable for use to reduce the emitted light amount to about 5%.

  The color light source of the present invention is controlled so that the main wavelength and luminance of each LED of red, orange, blue, and green have desired values by covering the LED with the above-described coating material. If there are red, orange LEDs, orange, blue LEDs, blue, green LEDs, green, the color light source can be finely adjusted. Therefore, the color light source of the present invention can easily and surely obtain the desired main wavelength and brightness as compared with the conventional case. Moreover, even if it is LED which has shifted | deviated from the target main wavelength and brightness | luminance, since the main wavelength and brightness | luminance of each LED can be controlled with the coating | covering material of this invention, waste can be eliminated. As described above, a color light source using an LED whose main wavelength and luminance are controlled is useful as, for example, a winker such as an automobile, a display of an audio device, a numerical display, a lamp, and the like.

  EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated more concretely, this invention is not limited to the following Example.

[Examples 1 to 3]
Add appropriate amount of vulcanizing agent to silicone rubber compound (trade name “SH851US”, manufactured by Toray Dow Corning Silicone), and add quinacridone reddish purple pigment (trade name “CINQUASIA Violet R RT-891-D” Ciba Specialty Chemicals) Co., Ltd.) is uniformly dispersed so that the pigment content is 0.2% by mass (Example 1), 0.3% by mass (Example 2), 0.5% by mass (Example 3), Using a mold and a heating press, a cap having a square shape with a thickness of 0.2 mm, a top surface of 1.2 × 1.4 mm, and a height of 0.5 mm having a reverse concave shape is used. A translucent coating material for LED was produced. The spectral transmittance curve of the quinacridone reddish purple pigment is shown in FIG.

As an LED, a red LED (trade name “LNJ808R8ERA” manufactured by Matsushita Electronics Co., Ltd.) having a wavelength region of 580 to 680 nm, a dominant wavelength of 627.8 nm, and a radiance of 31.58 (cd / m ² ) at the dominant wavelength is used. Using. The relationship between the wavelength and emission intensity of this red LED is shown in FIG. 2 and FIG. 3 (in the graph of FIG. 2, the wavelength (x axis) 580 to 680 nm portion is selected and the wavelength scale is changed). Shown as “red LED”.

  Each of the above LED transparent coating materials (Examples 1 to 3) was mounted on the red LED, and the luminance, chromaticity, and dominant wavelength were measured. The results are shown in Table 1. In addition, red LEDs (0.2% cap coating (Example 1), 0.3% cap coating (Example 2),. The relationship between the wavelength of the 5% cap coating (Example 3) and the emission intensity is shown in FIGS.

[Example 4]
Add appropriate amount of vulcanizing agent to silicone rubber compound (trade name “SH851US”, manufactured by Toray Dow Corning Silicone), IRGALITE (Irgarite) Green GFNP (trade name, manufactured by Ciba Specialty Chemicals, halogenated copper phthalocyanine, C I. Generic Name: Pigment Green 7) is uniformly dispersed so that the pigment content is 0.3% by mass, and the thickness is 0.2 mm and the upper surface is 1.2 × using a mold and a heating press. A translucent coating material for LED of Example 4 was manufactured by molding a 1.4 mm square and 0.5 mm high vertical cross-section into a reverse concave cap shape. A spectral transmittance curve of the above-mentioned copper halide phthalocyanine pigment is shown in FIG.

  As the LED, an orange LED (trade name “LNJ408K8YRA” (manufactured by Matsushita Electronics Industrial Co., Ltd.) is used, and the translucent covering material for LED of Example 4 is attached to the orange LED, and brightness, chromaticity, and main wavelength are adjusted. The results are shown in Table 2. Further, the relationship between the wavelength of the orange LED and the orange LED (0.3% cap coating) equipped with the translucent coating material for LED of Example 4 and the emission intensity is shown in the above diagram. 5 and FIG.

It is a graph which shows the relationship between the spectral transmission factor of the pigment used for the translucent coating material for LED of Examples 1-3 of this invention, and a wavelength. It is a graph which shows the relationship between the wavelength of red LED which mounted | wore with the red LED used for Examples 1-3 of this invention and each LED translucent coating | covering material, and light emission intensity. It is a graph which changes the scale of the x-axis of the graph of the said FIG. 2, and shows the part. It is a graph which shows the relationship between the spectral transmittance of the pigment used for the translucent coating material for LED of Example 4 of this invention, and a wavelength. It is a graph which shows the relationship between the wavelength and emission intensity of orange LED which mounted | worn with the orange LED used for Example 4 of this invention, and the translucent coating material for LED. It is a graph which changes the scale of the x-axis of the graph of the said FIG. 5, and shows the part.

Claims (14)

  A light-transmitting covering material to be attached to a light emitting diode, wherein in the wavelength region where the light emitting diode emits light, the light absorption rate from the light emitting diode is different between the long wavelength side region and the short wavelength side region, A light-transmitting coating material for a light-emitting diode, comprising a dye or pigment having a spectral transmittance curve in which a difference between a minimum spectral transmittance and a maximum spectral transmittance is 30% or more.   2. The light emitting diode according to claim 1, wherein the dye or pigment has a spectral transmittance curve in which the spectral transmittance on the long wavelength side is higher than the spectral transmittance on the short wavelength side in the wavelength region where the light emitting diode emits light. Translucent coating material. The spectral transmittance curve in the wavelength region where the light emitting diode emits the dye or the pigment has a spectral transmittance (τ ₁ ) of 70% or more with respect to the longest wavelength in the wavelength region, and the spectral with respect to the shortest wavelength in the wavelength region. The translucent covering material for light emitting diodes of Claim 1 or 2 whose difference ((tau) _1- (tau) ₂ ) with the transmittance | permeability ((tau) ₂ ) is 30% or more. The light-emitting diode according to claim 1, 2 or 3, wherein the dye or pigment has a spectral transmittance curve having at least one of the following conditions (A) and (B) in a wavelength region where the light-emitting diode emits light. Translucent coating material.
(A) The maximum spectral transmittance is shown between the longest wavelength and the dominant wavelength in the wavelength region. (B) The minimum spectral transmittance is shown between the shortest wavelength and the dominant wavelength in the wavelength region.   The translucent covering material for light emitting diodes of any one of Claims 1 thru | or 4 in which the said dye or pigment has the spectral transmittance curve bent in the vicinity of the dominant wavelength of the said light emitting diode.   2. The light emitting diode according to claim 1, wherein the dye or pigment has a spectral transmittance curve in which the spectral transmittance on the short wavelength side is higher than the spectral transmittance on the long wavelength side in the wavelength region where the light emitting diode emits light. Translucent coating material. The spectral transmittance curve in the wavelength region where the light emitting diode emits the dye or pigment has a spectral transmittance (τ ₃ ) of 70% or more with respect to the shortest wavelength in the wavelength region, and the spectral with respect to the longest wavelength in the wavelength region. The translucent covering material for light emitting diodes of Claim 1 or 6 whose difference ((tau) _3- (tau) ₄ ) with the transmittance | permeability ((tau) ₄ ) is 30% or more. The light-emitting diode according to claim 1, 6 or 7, wherein the dye or pigment has a spectral transmittance curve having at least one of the following conditions (C) and (D) in a wavelength region where the light-emitting diode emits light. Translucent coating material.
(C) The maximum spectral transmittance is shown between the shortest wavelength and the dominant wavelength in the wavelength region. (D) The minimum spectral transmittance is shown between the longest wavelength and the dominant wavelength in the wavelength region.   The translucent coating material for light emitting diodes of any one of Claims 1 thru | or 8 containing 0.01-2 mass% of said dyes or pigments.   The light-transmitting coating material for a light-emitting diode according to any one of claims 1 to 9, further comprising a dye or a pigment having a spectral transmittance curve in which a spectral transmittance hardly changes in a wavelength region where the light-emitting diode emits light. .   The translucent covering material for light emitting diodes of Claim 10 which contains 0.01-2 mass% of said dyes or pigments.   The translucent covering material for light emitting diodes of any one of Claims 1 thru | or 11 formed with the silicone type elastomer which disperse | distributed and contained the said dye or pigment uniformly.   The translucent covering material for light emitting diodes of any one of Claims 1 thru | or 12 which has a cap shape or a sheet | seat shape.   A color light source comprising the light-emitting diode and the translucent covering material for a light-emitting diode according to any one of claims 1 to 13.

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