JP6712768B2 - Light emitting device and lighting device - Google Patents

Description

The present invention relates to a light emitting device using a light emitting element as a light source, and a lighting device using the same.

A semiconductor light emitting element such as a light emitting diode (LED: Light Emitting Diode) is widely used as a highly efficient and space-saving light source in various lighting devices such as lighting applications and display applications.

Further, a COB (Chip On Board) type light emitting module (light emitting device) in which an LED mounted on a substrate is sealed with a translucent resin or a packaged SMD (Surface Mount Device) type light emitting element is used. A known light emitting device is known (for example, see Patent Document 1).

JP, 2011-146640, A

White light emitted by a light-emitting device using a light-emitting element such as an LED has uneven emission spectrum and thus has lower color reproducibility than natural light. That is, in the light emitting device as described above, it is a problem to improve color reproducibility.

The present invention provides a light emitting device and a lighting device capable of improving blue color reproducibility.

A light-emitting device according to one embodiment of the present invention includes a first light-emitting element having a peak emission wavelength of 445 nm to 460 nm, a second light-emitting element having a peak emission wavelength of 465 nm to 490 nm, and the first light-emitting element or the above. A phosphor that emits light when excited by the light emitted by the second light emitting element is provided, and emits white light by mixing the light emitted by each of the first light emitting element, the second light emitting element, and the phosphor. ..

An illumination device according to one aspect of the present invention includes the light emitting device, and a lighting device that supplies power to the light emitting device to light the light emitting device.

The light emitting device and the lighting device of the present invention can improve the reproducibility of blue color.

FIG. 1 is an external perspective view of the lighting device according to the first embodiment. FIG. 2 is an external perspective view of the lighting device according to Embodiment 1 when it is disassembled into a fixture body and a light emitting unit. FIG. 3 is an external perspective view of the light emitting device according to the first embodiment. FIG. 4 is a schematic cross-sectional view of the light emitting device according to the first embodiment. FIG. 5 is a circuit diagram showing an electrical connection relationship between a plurality of blue LED chips and a plurality of blue green LED chips. FIG. 6 is a diagram showing an example of an emission spectrum of white light emitted by the light emitting device according to the first embodiment. FIG. 7 is a diagram showing the spectral reflectance of the test color having the special color rendering index R12. FIG. 8 is a diagram showing an emission spectrum of white light emitted by the light emitting device according to the second embodiment. FIG. 9 is a diagram showing special color rendering evaluation numbers R9 to R15 of the light emitting device according to the second embodiment.

Hereinafter, a light emitting device and a lighting device according to the embodiments will be described with reference to the drawings. It should be noted that each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, connection forms, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the constituent elements in the following embodiments, the constituent elements that are not described in the independent claim indicating the highest concept are described as arbitrary constituent elements.

It should be noted that each drawing is a schematic diagram and is not necessarily strictly illustrated. Further, in each drawing, the same reference numerals are given to substantially the same configurations, and overlapping description may be omitted or simplified.

(Embodiment 1)
[Configuration of lighting device]
First, the lighting device according to the first embodiment will be described. FIG. 1 is an external perspective view of the lighting device according to the first embodiment. FIG. 2 is an external perspective view of the lighting device according to Embodiment 1 when it is disassembled into a fixture body and a light emitting unit.

As shown in FIGS. 1 and 2, the lighting device 100 according to the first embodiment includes a light emitting unit 110 and a fixture body 120. The lighting device 100 is a so-called base light and is used in, for example, a school, an office, a factory, or the like.

The fixture body 120 is a member that serves as a base of the lighting device 100, and is fixed to the ceiling by, for example, bolts and nuts. The instrument body 120 has a recess 130 in which the light emitting unit 110 is embedded. The light emitting unit 110 is detachably attached to the instrument body 120, for example.

If the light emitting unit 110 is detachably attached to the instrument body 120, various methods can be adopted as the attaching method. The light emitting unit 110 may be attached to the instrument main body 120, for example, by a metal fitting (not shown) included in the light emitting unit 110 engaging with a hole formed on the inner surface of the recess 130. Further, the light emitting unit 110 may be attached to the instrument body 120 by a fastening member such as a screw.

A lighting device 140 that converts AC power supplied from the power system into DC power and supplies the DC power to the light emitting unit 110 (light emitting device 10) is provided inside the fixture body 120. The lighting device 140 supplies the light emitting device 10 with electric power for lighting the light emitting device 10. Specifically, the lighting device 140 supplies DC power to the light emitting unit 110 via a connector 150 provided at an end of an electric wire extended from the fixture body 120. By fitting the connector 150 and the connector 160 provided at the end of the electric wire extended from the light emitting unit 110, the DC power necessary for the light emission of the light emitting unit 110 is generated from the device body 120 to the light emitting unit 110. Supplied.

The light emitting unit 110 includes the light emitting device 10 that emits illumination light and a cover member 180 that covers the light emitting device 10.

The light emitting device 10 is a light emitting module using an LED element as a light source (light emitting element). The detailed configuration of the light emitting device 10 will be described later.

The cover member 180 is a member that transmits the light emitted by the light emitting device 10. The cover member 180 is formed of, for example, transparent glass or resin. Further, in the first embodiment, the cover member 180 has a function of diffusing the light emitted by the light emitting device 10. For example, a milk-white light diffusing film is formed on the cover member 180 by attaching a resin or a white pigment containing a light diffusing material (fine particles) such as silica or calcium carbonate to the inner surface or the outer surface of the cover member 180. Further, the cover member 180 itself may be molded using a resin material or the like in which the light diffusion material is dispersed.

Note that it is not essential that the cover member 180 has a function of diffusing light, and the cover member 180 may be transparent so that the inside of the cover member 180 can be visually recognized.

[Configuration of light emitting device]
Next, the configuration of the light emitting device 10 will be described with reference to the drawings. FIG. 3 is an external perspective view of the light emitting device 10. FIG. 4 is a schematic cross-sectional view of the light emitting device 10. 4 is a schematic cross-sectional view of the light emitting device 10 cut along the lateral direction of the substrate, and FIG. 4 also includes a partially enlarged view of the light emitting device 10 (a part surrounded by a broken line). Be done.

As shown in FIGS. 3 and 4, the light emitting device 10 according to the first embodiment includes a substrate 14, a plurality of blue LED chips 11, a plurality of blue green LED chips 12, and a sealing member 13.

The light emitting device 10 is a so-called COB structure LED module in which an LED chip is directly mounted on a substrate 14. As will be described later, the light emitting device 10 can emit white light with an improved special color rendering index R12. That is, blue reproducibility can be improved.

The board 14 is a board on which the plurality of blue LED chips 11 and the plurality of blue green LED chips 12 are mounted. The board 14 has wirings (not shown) for supplying electric power to the plurality of blue LED chips 11 and the plurality of blue green LED chips 12, and a connector 16. The connector 16 is a connector for supplying DC power from the lighting device 140 to the plurality of blue LED chips 11 and the plurality of blue green LED chips 12.

The substrate 14 is, for example, a metal base substrate or a ceramic substrate. Further, the substrate 14 may be a resin substrate having a resin as a base material.

As the ceramic substrate, an alumina substrate made of aluminum oxide (alumina) or an aluminum nitride substrate made of aluminum nitride is used. Further, as the metal base substrate, for example, an aluminum alloy substrate, an iron alloy substrate, a copper alloy substrate, or the like having an insulating film formed on the surface is adopted. As the resin substrate, for example, a glass epoxy substrate made of glass fiber and epoxy resin is used.

A substrate having a high light reflectance (for example, a light reflectance of 90% or more) may be used as the substrate 14. By adopting a substrate having a high light reflectance as the substrate 14, the light emitted from the blue LED chip 11 can be reflected on the surface of the substrate 14. As a result, the light extraction efficiency of the light emitting device 10 is improved. An example of such a substrate is a white ceramic substrate having alumina as a base material.

Further, as the substrate 14, a translucent substrate having high light transmittance may be adopted. Examples of such a substrate include a translucent ceramics substrate made of polycrystalline alumina or aluminum nitride, a transparent glass substrate made of glass, a quartz substrate made of quartz, a sapphire substrate made of sapphire, or a transparent resin substrate made of a transparent resin material. It is illustrated.

Although the substrate 14 has a long plate shape (rectangular plate shape) in the first embodiment, it may have another shape.

The blue LED chip 11 is an example of a first light emitting element, and is an LED chip having a peak wavelength (center wavelength) of light emission of 445 nm or more and 460 nm or less. The blue LED chip 11 is specifically an LED chip that emits blue light, and is made of, for example, an InGaN-based material. In the first embodiment, blue LED chip 11 has an emission peak at a wavelength of 450 nm.

The blue-green LED chip 12 is an example of a second light emitting element, and is an LED chip having a peak emission wavelength of 465 nm or more and 490 nm or less. The blue-green LED chip 12 is specifically an LED chip that emits blue-green light, and is made of, for example, an InGaN-based material. The blue-green LED chip can be manufactured by increasing the amount of In in the same manufacturing process as the blue LED chip. In the first embodiment, the blue-green LED chip 12 has an emission peak at a wavelength of 480 nm.

When the blue LED chip 11 and the blue-green LED chip 12 are both made of InGaN-based material, the difference in Vf-If characteristics between the blue LED chip 11 and the blue-green LED chip 12 is small, and The difference in temperature characteristics between the blue LED chip 11 and the blue-green LED chip 12 is small. Therefore, there is an advantage that the degree of freedom in electrical connection of the light emitting element is high (the total Vf can be easily adjusted).

On the substrate 14, the plurality of blue LED chips 11 and the plurality of blue green LED chips 12 are arranged in a line along the longitudinal direction of the substrate 14. That is, the plurality of blue LED chips 11 and the plurality of blue green LED chips 12 form one light emitting element row. Here, in this light emitting element array, the blue LED chips 11 and the blue-green LED chips 12 are alternately arranged. Accordingly, it is possible to reduce the color unevenness of the white light emitted from the light emitting device 10.

Note that the plurality of blue LED chips 11 and the plurality of blue-green LED chips 12 that configure one light emitting element row are electrically connected as shown in FIG. 5, for example. FIG. 5 is a circuit diagram showing an electrical connection relationship between the plurality of blue LED chips 11 and the plurality of blue green LED chips 12.

As shown in FIG. 5, the light emitting element array electrically includes a first group 21 and a second group 22. Each of the first group 21 and the second group 22 is composed of a plurality of light emitting elements, and the first group 21 and the second group 22 are connected in series.

In the first group 21, four sets of four light emitting elements connected in series are connected in parallel. In the second group 22, seven sets of three light emitting elements connected in series are connected in parallel.

As for the electrical connection relationship as shown in FIG. 5, the wiring (not shown) provided on the substrate 14 and the bonding wire (not shown) for connecting the light emitting elements to each other or the light emitting element and the wiring are connected to each other. Is realized by

The light emitting device 10 (light emitting element array) includes the same number of blue LED chips 11 and the same number of blue green LED chips 12, so that only the blue LED chips 11 are used for the light intensity of blue light. It can be reduced to about half of the case. In the example of FIG. 5, the blue-green LED chip 12 is one more than the blue LED chip 11, and the number of blue LED chips 11 (24) and the number of blue-green LED chips 12 (25) are almost the same. Is. Here, “substantially the same” means that the difference between the number of blue LED chips 11 and the number of blue-green LED chips 12 is within 10% of the total number (49) of light emitting elements.

The sealing member 13 is a sealing member that collectively seals the plurality of blue LED chips 11 and the plurality of blue green LED chips 12. Specifically, the sealing member 13 is made of a translucent resin material including a plurality of yellow phosphors 15y and a plurality of red phosphors 15r as a wavelength conversion material. In Embodiment 1, a methyl-based silicone resin is used as the translucent resin material, but an epoxy resin, a urea resin, or the like may be used. The sealing member 13 is formed in a line shape along the longitudinal direction of the substrate 14.

The sealing member 13 may individually seal a plurality of LED chips (the plurality of blue LED chips 11 and the plurality of blue-green LED chips 12) for each chip. However, when a plurality of LED chips are sealed for each chip, parts having slightly different colors are arranged alternately. That is, the tint changes periodically along the longitudinal direction of the light emitting device 10, and a subtle tint difference is easily visible. A configuration in which a plurality of LED chips are collectively sealed by the sealing member 13 is preferable because the light of adjacent LED chips is mixed inside the sealing member 13 to improve the uniformity of the tint.

The yellow phosphor 15y is an example of a phosphor (phosphor particle), and is excited by blue light emitted by the blue LED chip 11 or blue-green light emitted by the blue-green LED chip 12 to emit yellow light. Specifically, the yellow phosphor 15y is a yttrium aluminum garnet (YAG)-based phosphor having a fluorescence peak wavelength of 550 nm or more and 570 nm or less. In the first embodiment, yellow phosphor 15y has an emission peak at a wavelength of 550 nm.

The red phosphor 15r is an example of a phosphor (phosphor particle), and is excited by blue light emitted by the blue LED chip 11 or blue-green light emitted by the blue-green LED chip 12 to emit red light. The red phosphor 15r is specifically a (Sr,Ca)AlSiN ₃ :Eu ²⁺ phosphor having a fluorescence peak wavelength of 610 nm or more and 620 nm or less. The red phosphor 15r is not essential, and the sealing member 13 may not include the red phosphor 15r.

With the above configuration, part of the blue light emitted by the blue LED chip 11 is wavelength-converted into yellow light by the yellow phosphor 15y included in the sealing member 13. Further, a part of the blue light emitted by the blue LED chip 11 is wavelength-converted into red light by the red phosphor 15r included in the sealing member 13.

Similarly, a part of the blue-green light emitted from the blue-green LED chip 12 is converted into yellow light by the yellow phosphor 15y included in the sealing member 13. Further, a part of the blue-green light emitted by the blue-green LED chip 12 is wavelength-converted into red light by the red phosphor 15r included in the sealing member 13.

Then, the blue light and the blue-green light not absorbed by the yellow phosphor 15y and the red phosphor 15r, the yellow light wavelength-converted by the yellow phosphor 15y, and the red light wavelength-converted by the red phosphor 15r , Diffused and mixed in the sealing member 13.

As a result, white light is emitted from the sealing member 13. That is, in the light emitting device 10, the blue light emitted by the blue LED chip 11, the blue-green light emitted by the blue-green LED chip 12, the yellow light emitted by the yellow phosphor 15y, and the red light emitted by the red phosphor 15r are not mixed. Emits white light. FIG. 6 is a diagram showing an example of an emission spectrum of white light emitted by the light emitting device 10. Note that FIG. 6 shows an emission spectrum when the color temperature of white light is approximately 5000K.

As shown in FIG. 6, in the emission spectrum of the white light emitted from the light emitting device 10, the peak of 450 nm that appears due to the emission of the blue LED chip 11 and the peak of 480 nm that appears due to the emission of the blue-green LED chip 12 are almost the same light. Strength. Here, the substantially same light intensity means, for example, that the ratio of the light intensity in the emission spectrum (light intensity at the emission peak of the blue LED chip 11/light intensity at the emission peak of the blue-green LED chip 12) is 0.90 or more 1 However, it is more preferable that the ratio of the light intensity in the emission spectrum is 0.95 or more and 1.05 or less.

Further, in the emission spectrum of white light, the peak that appears due to the emission of the blue LED chip 11 is lower than the peak that appears due to the emission of the yellow phosphor 15y. In the example of FIG. 6, the value obtained by dividing the light intensity at the light emission peak of the blue LED chip 11 by the light intensity at the light emission peak of the yellow phosphor 15y is about 0.90 or more and 1.03 or less, but more preferably, It is about 0.95 or more and 0.98 or less. In FIG. 6, the peak that appears due to the emission of the yellow phosphor 15y appears near 570 nm, which is slightly different from the emission peak wavelength of 550 nm of the yellow phosphor 15y. This is because the body 15r is included.

The color temperature of the white light emitted by the light emitting device 10 is not limited to 5000 K, and is, for example, 4000 K or more and 7000 K or less. The color temperature can be adjusted, for example, by adjusting the amount of the yellow phosphor 15y included in the sealing member 13 or by including a phosphor other than the yellow phosphor 15y in the sealing member 13.

For example, the sealing member 13 may include a green phosphor instead of the yellow phosphor 15y or in addition to the yellow phosphor 15y. Specifically, the green phosphor is, for example, a Lu ₃ Al ₅ O ₁₂ :Ce ³⁺ phosphor having a fluorescence peak wavelength of 520 nm or more and 540 nm or less.

Further, the color temperature of the white light emitted from the light emitting device 10 may be finely adjusted by changing the balance between the light intensity of the blue LED chip 11 and the light intensity of the blue-green LED chip 12. That is, in the emission spectrum of the white light emitted from the light emitting device 10, the light intensity of the blue LED chip 11 may be lower or higher than the light intensity of the blue green LED chip 12.

[effect]
The light emitting device 10 includes a blue LED chip 11 having a light emission peak at 480 nm, in addition to a blue LED chip 11 generally used for a white light source. Thereby, the light emitting device 10 can improve blue color reproducibility. Specifically, the white light emitted from the light emitting device 10 has an improved special color rendering index R12.

The special color rendering index including the special color rendering index R12 is obtained by the color difference obtained by illuminating the test color with the sample light source (in this case, the light emitting device 10). FIG. 7 is a diagram showing the spectral reflectance (reflection spectrum) of the test color having the special color rendering index R12.

As shown in FIG. 7, the test color having the special color rendering index R12 mainly reflects light in the range of 400 nm to 550 nm. Since the light emitting device 10 includes the blue LED chip 11 having an emission peak at 450 nm and the blue-green LED chip 12 having an emission peak at 480 nm, the white light emitted by the light emitting device 10 is in the range of 400 nm to 550 nm. The light intensity is increased in a wide range. Therefore, the white light emitted from the light emitting device 10 has an improved special color rendering index R12. That is, the light emitting device 10 and the lighting device 100 including the light emitting device 10 can improve blue reproducibility.

The peak wavelength of light emitted by the blue LED chip 11 generally has a variation of about 445 nm to 465 nm. Therefore, one light emitting device may include a plurality of blue LED chips 11 having different emission peak wavelengths. However, as described above, the light emitting device in which the blue LED chip 11 having the maximum emission peak wavelength of about 465 nm is mixed has the emission peak of the blue LED chip 11 in the reflection spectrum of the test color of the special color rendering index R12. A valley region is included between the wavelength and the emission peak wavelength of the yellow phosphor 15y.

That is, in the light emitting device including only the plurality of blue LED chips 11, the peak wavelength of the light emission varies only within the above range, so that the above valley region of the reflection spectrum cannot be filled, and the special color rendering index R12. Can not be improved.

On the other hand, in the light emitting device 10, a plurality of types of LED chips having different emission peak wavelengths are mixedly mounted, so that the valley of the reflection spectrum is sufficiently filled, and thus the special color rendering index R12 is increased.

(Embodiment 2)
The light emitting device 10 further includes a red LED chip that emits red light, and emits white light by mixing lights emitted from the blue LED chip 11, the blue green LED chip 12, the red LED chip, and the yellow phosphor 15y. You may emit. Hereinafter, the light emitting device according to the second embodiment will be described.

The light emitting device according to the second embodiment has the same basic structure as that shown in FIGS. 3 and 4, but a red light emitting red light is emitted among a plurality of light emitting elements mounted on the substrate 14. An LED chip is included. The number of red LED chips with respect to the number of blue LED chips 11 and blue-green LED chips 12 is determined according to the light output of the red LED chips and the like in order to realize the emission spectrum described later. In addition, the sealing member included in the light emitting device according to the second embodiment includes at least one of the yellow phosphor 15y and the green phosphor described in the first embodiment in an appropriate amount in order to realize an emission spectrum described later. .. Further, in order to realize the emission spectrum described later, the red phosphor 15r may or may not be included in the sealing member included in the light emitting device according to the second embodiment as appropriate.

The red LED chip is an example of the third light emitting element. More specifically, the red LED chip is formed of an AlGaInP-based material. The peak wavelength of the light emitted from the red LED chip varies depending on the color temperature of the light emitted from the light emitting device, but in the second embodiment, the red LED chip has an emission peak in the range of approximately 630 nm to 645 nm.

The number and arrangement of the red LED chips are determined, for example, in consideration of the total Vf and color unevenness in the circuit so that the white light emitted by the light emitting device according to the second embodiment has the following emission spectrum. .. FIG. 8 is a diagram showing an emission spectrum of white light emitted by the light emitting device according to the second embodiment.

Note that FIG. 8 also illustrates the emission spectrum of white light emitted by the light emitting device according to the comparative example. The light emitting device according to the comparative example emits white light by the combination of the blue LED chip 11 having a peak emission wavelength of 450 nm, the yellow phosphor, and the red phosphor. The light emitting device according to the comparative example does not include a blue-green LED chip and a red LED chip.

As shown in FIG. 8, in the emission spectrum of the white light emitted from the light emitting device 10, the peak around 550 nm that appears due to the emission of the yellow phosphor 15y is lower than the peak around 630 nm that appears due to the emission of the red LED chip. Specifically, the light intensity at the peak near 550 nm is 1/3 or less of the light intensity at the peak appearing due to the light emission of the red LED chip.

Further, the peak around 480 nm that appears due to the emission of the blue-green LED chip 12 is lower than the peak near 550 nm that appears due to the emission of the yellow phosphor 15y. Specifically, the light intensity at the peak near 480 nm is half or less of the light intensity at the peak near 550 nm.

The peak around 450 nm that appears due to the light emission of the blue LED chip 11 is lower than the peak around 480 nm that appears due to the blue-green LED chip 12. Specifically, the light intensity at the peak near 450 nm is 3/4 or less of the light intensity at the peak near 480 nm.

The white light emitted by the light emitting device according to the second embodiment as described above has each of the special color rendering evaluation numbers R9 to R15 increased. FIG. 9 is a diagram showing special color rendering evaluation numbers R9 to R15 of the light emitting device according to the second embodiment. Note that FIG. 9 also illustrates the special color rendering evaluation numbers R9 to R15 of the light emitting device according to the comparative example.

As shown in FIG. 9, in the white light emitted by the light emitting device according to the second embodiment, each of the special color rendering index R9 to R15 is 85 or more. In particular, since the light emitting device according to the second embodiment has the red LED chip that emits red light, the special color rendering index R9 is higher than that of the light emitting device according to the comparative example.

Moreover, since the light emitting device according to the second embodiment has the blue-green LED chip 12 that emits blue-green light, the special color rendering index R12 is high as described in the first embodiment. Since the light emitting device according to the comparative example does not have the blue-green LED chip 12, the light intensity in the vicinity of 480 nm of the emission spectrum is insufficient (a valley near 480 nm of the emission spectrum). Therefore, the special color rendering index R12. Is considered low.

As described above, in the light emitting device according to the second embodiment, the special color rendering evaluation numbers R9 to R15 are generally high. The light emitting device according to the second embodiment can improve red reproducibility in addition to blue reproducibility.

(Summary)
As described above, the light emitting device 10 includes the blue LED chip 11 having a peak emission wavelength of 445 nm to 460 nm, the blue-green LED chip 12 having a peak emission wavelength of 465 nm to 490 nm, and the blue LED chip 11 or blue. It is provided with a yellow phosphor 15y which emits light when excited by the light emitted from the green LED chip 12. The light emitting device 10 emits white light by mixing lights emitted from the blue LED chip 11, the blue-green LED chip 12, and the yellow phosphor 15y.

Thereby, the light emitting device 10 can improve blue color reproducibility. Further, in recent years, the influence of blue light on human eyes has been feared, but the light emitting device 10 emits white light by using blue-green light in addition to blue light. Therefore, the light emitting device 10 can reduce the peak of blue light in the emission spectrum and reduce the above-mentioned concern.

Further, the light emitting device 10 may include a plurality of blue LED chips 11 and a plurality of blue-green LED chips 12, respectively, and the numbers of the blue LED chips 11 and the numbers of the blue-green LED chips 12 may be substantially the same.

Thereby, the light emitting device 10 can reduce the light intensity of blue light to about half that in the case where only the blue LED chip 11 is used. That is, it is possible to reduce the user's concern about blue light.

The light emitting device 10 further includes a substrate 14 on which a light emitting element array including a plurality of blue LED chips 11 and a plurality of blue green LED chips 12 is mounted. In the light emitting element array, the blue LED chip 11 and the blue green LED are provided. The chips 12 may be arranged alternately.

Thereby, the color unevenness of the light emitting device 10 can be reduced.

The color temperature of the light emitted by the white light may be 4,000 K or more and 7,000 K or less.

The light emitting device 10 including both the blue LED chip 11 and the blue green LED chip 12 is suitable for a white light source having a high color temperature. That is, the light emitting device 10 can easily realize a white light source of 4000K or more and 7000K or less.

Further, in the emission spectrum of white light, the peak that appears due to the emission of the blue LED chip 11 may be lower than the peak that appears due to the emission of the yellow phosphor 15y.

As a result, the light emitting device 10 can realize the emission spectrum as shown in FIG.

In addition, the light emitting device 10 further includes a red LED chip that emits red light, and the blue LED chip 11, the blue green LED chip 12, the red LED chip, and the yellow phosphor 15 y emit white light by mixing with each other. May emit light.

As a result, the light emitting device 10 can enhance red reproducibility in addition to blue reproducibility.

Further, in the emission spectrum of white light, the peak that appears due to the emission of the yellow phosphor 15y may be lower than the peak that appears due to the emission of the red LED chip, and the peak that appears due to the emission of the blue-green LED chip 12 may be the yellow phosphor. It may be lower than the peak appearing due to the emission of 15y. In the emission spectrum of white light, the peak that appears due to the emission of the blue LED chip 11 may be lower than the peak that appears due to the blue-green LED chip 12.

Thereby, the light emitting device 10 can emit white light having high color rendering properties as shown in FIG.

The light emitting device 10 may further include a sealing member 13 that includes the yellow phosphor 15y and collectively seals the blue LED chip 11 and the blue-green LED chip 12.

As a result, the light emitting device 10 can emit white light from the sealing member 13.

In addition, the lighting device 100 includes the light emitting device 10 and a lighting device that supplies the light emitting device 10 with electric power for lighting the light emitting device 10.

Accordingly, the lighting device 100 can improve the reproducibility of blue color.

(Other embodiments)
Although the light emitting device and the lighting device according to the embodiments have been described above, the present invention is not limited to the above embodiments.

In the above embodiment, the LED chip is exemplified as the light emitting element, but a semiconductor light emitting element such as a semiconductor laser, or another type of solid state light emitting element such as an EL element such as an organic EL (Electro Luminescence) or an inorganic EL is used. , May be adopted as a light emitting element.

Further, for example, although the light emitting device realized as the light emitting module having the COB structure has been described in the above embodiment, the light emitting device of the present invention may be realized as an SMD type light emitting element. Further, the light emitting device of the present invention may be realized as an SMD structure light emitting device including such an SMD type light emitting element. The SMD type light emitting element includes, for example, a resin container having a recess, an LED chip mounted in the recess, and a sealing member (phosphor-containing resin) sealed in the recess.

Further, the light emitting device of the present invention may be realized as a remote phosphor type light emitting device in which a resin member containing a phosphor is arranged at a position apart from the LED chip. Further, the shape, structure, and size of the light emitting device of the present invention are not particularly limited.

Further, in the above-described embodiment, the base light is exemplified as the lighting device, but the present invention may be realized as a lighting device other than the base light, such as a ceiling light, a spotlight, and a downlight.

In addition, it is realized by making various modifications to those skilled in the art by those skilled in the art, or realized by arbitrarily combining the components and functions in each embodiment without departing from the spirit of the present invention. The present invention also includes the forms.

10 Light emitting device 11 Blue LED chip (first light emitting element)
12 Blue-green LED chip (second light emitting element)
13 Sealing member 14 Substrate 15y Yellow phosphor (phosphor)
100 lighting device 140 lighting device

Claims (6)

A first light-emitting element having a peak emission wavelength of 445 nm or more and 460 nm or less;
A second light emitting element having an emission peak wavelength of 465 nm or more and 490 nm or less;
A phosphor that emits light when excited by the light emitted by the first light emitting element or the second light emitting element ,
And a sealing member that includes the phosphor and collectively seals the first light emitting element and the second light emitting element ,
The first light emitting element, the second light emitting element, and emits white light by mixing the light emitted by each of the phosphor,
A light emitting device in which, in the emission spectrum of the white light, a peak generated by the emission of the first light emitting element and a peak generated by the emission of the second light emitting element have substantially the same light intensity. The light emitting device includes a plurality of first light emitting elements and a plurality of second light emitting elements,
The light emitting device according to claim 1, wherein the number of the first light emitting elements and the number of the second light emitting elements are substantially the same. Further, a substrate on which a light emitting element array including a plurality of the first light emitting elements and a plurality of the second light emitting elements is mounted,
The light emitting device according to claim 1, wherein the first light emitting element and the second light emitting element are alternately arranged in the light emitting element row. The light emitting device according to claim 1, wherein the color temperature of the white light is 4000 K or more and 7000 K or less. In the emission spectrum of the white light, the peak that appears due to the emission of the first light emitting element and the peak that appears due to the emission of the second light emitting element are both lower than the peak that appears due to the emission of the phosphor. the light emitting device according to any one of 3. A light emitting device according to any one of claims 1 to 5
A lighting device, comprising: a lighting device that supplies power to the light emitting device to light the light emitting device.

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