KR102159984B1 - LED lighting source for high-rendering vision safeguard - Google Patents

Abstract

According to one embodiment of the present invention, LED light source for a high-color rendering vision safeguard includes: an excitation light source radiating a wavelength of 455 nm to 475 nm; and a plurality of fluorescent substances radiating light of a specific wavelength by being excited to light provided from the excitation light source. The fluorescent substances includes: a first fluorescent substance formed of one selected from among a fluorescent material expressed by [chemical formula 1] (Sr,Ca) AlSiN3:Eu, a fluorescent material expressed by [chemical formula 2] CaAlSiN3:Eu and a fluorescent material mixing the materials; and a second fluorescent substance formed of one selected from among a fluorescent material expressed by [chemical formula 3] (Sr,Ca) (Ba,Sr,Ca,Mg,Eu) 2SiO4, a fluorescent material expressed by [chemical formula 4] Y3 (Al,Ga) 5O12:Ce and a fluorescent material mixing the materials. In regard to a white spectrum radiated through the excitation light source, the first and second fluorescent substances, a color rendering index is no less than 90 Ra, R9 is no less than 50, a wavelength ratio of a 415-455 nm range is less than 40%, and a wavelength ratio in a 465 to 495 nm area is no less than 100%.

Description

LED lighting source for high-rendering vision safeguard}

The present invention relates to an LED light source, and more particularly, to a high-rendering vision safeguard LED light source that emits a white spectrum beneficial to the human body.

The lighting industry is an important energy industry that accounts for about 25% of Korea's total power consumption, and is a necessity for a wide range of human life such as houses, offices, roads, medical care, sports, and tourism, and for industrial and special lighting (semiconductors, UV lamps in the mining industry, etc.) It can be said to be a measure of entry into advanced countries as it provides increased productivity in other industries and has a large ripple effect on energy, society, culture, and the environment, and it can be said to be a national important industry that provides industrial development and quality improvement of people's lives. .

The lighting industry has been developed starting with incandescent bulbs, fluorescent lamps, high-pressure discharge lamps, and electrodeless discharge lamps. However, as social demands increase, new LED (light emitting diode) lighting devices that require high efficiency, long life, and environmental friendliness are required.

Accordingly, the development of variable color light sources for LEDs used in LED (light emitting diode) lighting equipment, luminous flux for R/G/B/A/W, color rendering evaluation index (CRI), correlated color temperature (CCT), CIE (Commission Internationale) de l'Eclairage) Research on basic optical properties such as chromaticity coordinates is ongoing.

However, the above study only presented the characteristics, and there was no specific design or analysis of the LED light source accordingly. In addition, until now, there has been no production of a light source as an LED light source for illumination, nor have there been any results of analysis on the luminous intensity and efficiency thereof, and there has been no study on the harmfulness to the human body.

Accordingly, recently, in LED lighting, harmful wavelengths and beneficial wavelengths have been published as research, and in particular, the problem of minimizing blue light has been raised as a major issue.

According to a recent study, when human visual cells are exposed to light in the wavelength range of about 415 nm to 455 nm, they show negative effects on the eyes (Eye-Hazardous), and the negative effects accumulate throughout life, and as a result, macular degeneration caused by aging. It has been shown to cause damage to human vision, such as causing age-related macular degeneration.

The macular degeneration described above is a major cause of vision loss in old age, but it can also occur in younger age groups in recent years, and it is known that when vision impairment begins due to this disease, it cannot be restored to previous vision.

On the other hand, to reduce the risk of light in the wavelength range of 415nm to 455nm, some studies have tried to use a filter in front of the LED light source or wear glasses equipped with a filter. In addition to the wavelength range that is harmful to the eyes in the wavelength range, the blue area required to make a white light source and the wavelength range of 465nm~495nm, which is beneficial for regulating the circumferential rhythm of the human body, are also causing another problem.

In other words, there is a limit of technical contradiction that cannot simultaneously satisfy the illumination composed of a light source having a more white spectrum in a wavelength range that is beneficial to the human body and solves the maximization of the color rendering index of 90Ra or more and R9 value close to sunlight.

Therefore, there is a need to develop an LED light source capable of minimizing light in a harmful wavelength band and maximizing a beneficial wavelength band.

The problem to be solved by the present invention is to have a white spectrum that minimizes the wavelength range harmful to the human body and maximizes the wavelength range harmful to the human body by using an excitation light source of 455nm to 465nm and optimizing the composition of the phosphor. It is to provide an LED light source for high color rendering vision safeguards.

The problems of the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

The LED light source for high color rendering vision safeguard according to an embodiment of the present invention includes an excitation light source emitting a wavelength of 455 nm to 475 nm, and a plurality of phosphors excited by light provided from the excitation light source to emit light of a specific wavelength range. However, the phosphors have a light emission wavelength of 600 ~ 650nm, a fluorescent material represented by [Chemical Formula 1] (Sr,Ca)AlSiN ₃ :Eu, [Chemical Formula 2] a fluorescent material represented by CaAlSiN ₃ :Eu, and a mixture thereof [Chemical Formula 3] (Ba,Sr,Ca,Mg,Eu) ₂ Fluorescent material represented by SiO ₄ , [Chemical Formula 4] having a light emitting wavelength of 500 to 540 nm, ] Y ₃ (Al,Ga) ₅ O ₁₂ : Including a second phosphor formed of a fluorescent material selected from among a fluorescent material represented by Ce and a fluorescent material mixture thereof, and the excitation light source, the first phosphor, and the second phosphor 2 In the white spectrum emitted through the phosphor, the color rendering index is 90Ra or more, R9 is 50 or more, the wavelength ratio in the range of 415-455nm is less than 40%, and the wavelength ratio in the range of 465nm to 495nm is 100% or more.

The peak of the blue wavelength in the white spectrum may be 455nm to 465nm.

The first phosphor and the second phosphor are dispersed and immobilized by a transparent resin, and the first phosphor contains 0.1 to 2% by weight of 100% by weight including the first phosphor, the second phosphor, and the transparent resin In addition, 8 to 13% by weight of the second phosphor may be included, and 85 to 91.9% by weight of the transparent resin may be included.

When the excitation light source is less than 455nm to 460nm, the peak of the blue wavelength in the white spectrum is 455nm to 460nm, R9 is 70, and the excitation light source is in the range of 460nm to 465nm, the peak of the blue wavelength in the white spectrum is 460nm to 465nm, R9 may be 73.

The LED light source for high color rendering vision safeguard according to another embodiment of the present invention includes an excitation light source emitting a wavelength of 455 nm to 475 nm, and a plurality of phosphors excited by light provided from the excitation light source to emit light of a specific wavelength range. However, the phosphors have a light emission wavelength of 600 ~ 650nm, a fluorescent material represented by [Chemical Formula 1] (Sr,Ca)AlSiN ₃ :Eu, [Chemical Formula 2] a fluorescent material represented by CaAlSiN ₃ :Eu, and a mixture thereof A first phosphor formed from any one selected from one of the fluorescent materials, has an emission wavelength of 500 to 540 nm, and is represented by [Chemical Formula 3] (Ba,Sr,Ca,Mg,Eu) ₂ SiO ₄ , [Chemical Formula 4] Y ₃ (Al,Ga) ₅ O ₁₂ : A second phosphor formed of a fluorescent material selected from among a fluorescent material represented by Ce and a fluorescent material mixture thereof, and an emission wavelength of 480 to 499 nm, [Formula 5] ] (Ba,Eu)Si ₂ (O,Cl) ₂ Includes a third phosphor represented by N ₂ , and the white spectrum emitted through the excitation light source, the first phosphor, the second phosphor and the third phosphor is color rendering The index is 90Ra or more, R9 is 50 or more, the wavelength ratio in the 415-455nm range is less than 40%, and the wavelength ratio in the 465nm to 495nm range is 100% or more.

The first phosphor, the second phosphor, and the third phosphor are dispersed and immobilized by a transparent resin, and the first phosphor among 100% by weight containing the first phosphor, the second phosphor, the third phosphor and the transparent resin May contain 0.1 to 2% by weight, the second phosphor may contain 8 to 13% by weight, the third phosphor may contain 0.1 to 2% by weight, and the transparent resin may contain 83 to 91.8% by weight have.

The peak of the blue wavelength in the white spectrum may be 455nm to 465nm.

When the excitation light source is less than 455nm to 460nm, the peak of the blue wavelength in the white spectrum is 455nm to 460nm, R9 is 70, and the excitation light source is in the range of 460nm to 465nm, the peak of the blue wavelength in the white spectrum is 460nm to 465nm, R9 may be 73.

Details of other embodiments are included in the detailed description and drawings.

According to the embodiments of the present invention, there are at least the following effects.

According to embodiments of the present invention, harmful wavelengths of 455 nm or less can be minimized by using a wavelength in the range of 455 nm to 465 nm as the excitation light source.

In addition, according to an embodiment of the present invention, by optimizing the composition of the phosphor, the color rendering index is 90Ra or more, and the value of R9, the red color rendering index, is 50 or more, thereby securing a white spectrum with high color rendering close to sunlight. Can, and has the effect of maximizing the beneficial wavelength in the range of 465nm to 495nm.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a cross-sectional view schematically showing an LED light source for a high color rendering vision safeguard according to an embodiment of the present invention.
2 is a graph showing an emission spectrum of a light source for a high color rendering vision safeguard according to an embodiment of the present invention.
3 is a table showing the result of color rendering evaluation for the LED light source for high color rendering vision safeguard according to an embodiment of the present invention.
4 is a cross-sectional view schematically showing an LED light source for a high color rendering vision safeguard according to another embodiment of the present invention.
5 is a graph showing an emission spectrum of an LED light source for a high color rendering vision safeguard according to another embodiment of the present invention.
6 is a table showing the result of color rendering evaluation of the LED light source for high color rendering vision safeguard according to embodiments of the present invention.

Advantages and features of the present specification, and a method of achieving them will become apparent with reference to embodiments described below in detail together with the accompanying drawings. However, the present specification is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments are intended to complete the disclosure of the present specification, and common knowledge in the technical field to which the present specification belongs. It is provided to completely inform the scope of the specification to those who have, and this specification is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present specification are exemplary and are not limited to the items shown in the present specification. The same reference numerals refer to the same components throughout the specification. In addition, in describing the present specification, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present specification, the detailed description thereof will be omitted. When'include','have','consists of' and the like mentioned in the present specification are used, other parts may be added unless'only' is used. In the case of expressing the constituent elements in the singular, it includes the case of including the plural unless specifically stated otherwise.

In interpreting the constituent elements, it is interpreted as including an error range even if there is no explicit description.

In the case of a description of the positional relationship, for example, if the positional relationship of the two parts is described as'on the top','on the top of the ~','the bottom of the','the next to the', etc.,'right' Or, unless'direct' is used, one or more other parts may be located between the two parts.

First, second, etc. may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first component mentioned below may be a second component within the technical idea of the present specification.

Each of the features of the various embodiments of the present specification can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or may be implemented together in an association relationship. May be.

Hereinafter, an electroluminescent display device according to an exemplary embodiment of the present specification will be described with reference to the accompanying drawings. The same reference numbers throughout the specification mean substantially the same elements. In the following description, when it is determined that detailed descriptions of known functions or configurations related to the present specification may unnecessarily obscure the subject matter of the present specification, detailed descriptions thereof will be omitted or briefly described.

1 is a cross-sectional view schematically showing an LED light source for a high color rendering vision safeguard according to an embodiment of the present invention, and FIG. 2 is a luminescence spectrum of an LED light source for a high color rendering vision safeguard according to an embodiment of the present invention. 3 is a graph, and FIG. 3 is a table showing the result of color rendering evaluation for the LED light source for high color rendering vision safeguard according to an embodiment of the present invention.

As shown in FIG. 1, the LED light source 100 for a high color rendering vision safeguard includes an excitation light source 130 and a plurality of phosphors 152 and 154.

In addition, the base substrate 110 for mounting the excitation light source 130 may be disposed in the LED light source 100 for high color rendering vision safeguard according to an embodiment of the present invention, and for controlling the excitation light source 130 The printed circuit board 200 may be disposed under the base substrate 110.

Here, the base substrate 110 and the printed circuit board 200 may be connected to each other by a surface mounting method (SMT). In the drawing, although the ball grid 210 is connected by bonding method, the base substrate 110 and the printed circuit board 200 may be connected in various ways, such as a wire connection method.

In the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention, an excitation light source 130 and a mold frame 170 for accommodating the phosphors 152 and 154 may be disposed. The mold frame 170 has an accommodation space, and an excitation light source 130 and phosphors 152 and 154 may be disposed in the accommodation space.

A reflector may be installed on the inner surface of the mold frame 170 to efficiently reflect light emitted from the excitation light source 130. Although not shown, one electrode of the excitation light source 130 may be electrically connected to the mold frame 170 through a bonding wire, and the other electrode of the excitation light source 130 is connected to the metal wiring on the base substrate 110. Can be electrically connected.

In addition, an encapsulant 150 capable of dispersing and fixing the phosphors 152 and 154 and sealing the excitation light source 130 may be disposed in the receiving space. A transparent resin may be used for the encapsulant 150, and for example, the encapsulant 150 may use any one selected from silicone, epoxy, and a mixture thereof.

The LED light source 100 for high color rendering vision safeguard according to an embodiment of the present invention includes an excitation light source 130 emitting a peak wavelength of 455 nm to 465 nm. The excitation light source 130 may be a blue LED chip. The blue LED chip may include a light emitting diode, and the light emitting diode may be a light emitting diode such as InGaN or GaN. In the present invention, other light emitting devices such as laser diodes may be used in place of the LED chip for the excitation light source 130.

The LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention includes phosphors 152 and 154 that are dispersed and immobilized in the encapsulant 150. The phosphors 152 and 154 include a first phosphor 152 that is excited by excitation light emitted from the excitation light source 130 to emit red light and a second phosphor 154 that emits green light. The first phosphor 152 and the second phosphor 154 are formed of fluorescent materials having different compositions.

The first phosphor 152 may be excited by the excitation light of the excitation light source 130 to emit light of 600 nm to 650 nm in a red wavelength band. The first phosphor 152 is a phosphor that emits red light, and may use any one selected from a fluorescent material represented by [Chemical Formula 1], a fluorescent material represented by [Chemical Formula 2], and a fluorescent material obtained by mixing them.

[Formula 1]

(Sr,Ca)AlSiN ₃ :Eu

[Formula 2]

CaAlSiN ₃ :Eu

The first phosphor 152 may contain 0.1 to 2% by weight of 100% by weight included in the encapsulant 170. The first phosphor 152 may reduce color distortion. Specifically, the degree of color distortion may increase as the value of the original colors such as R9 (Red), R11 (Green), R12 (Blue) among the color rendering indexes decreases. That is, in the CIE color coordinate system, X and Y coordinates must be determined along the BBL (Black Body Locus) Line for each CCT, so that the color rendering property can be made almost similar to sunlight.

However, currently commonly used lighting uses LED lighting that combines blue chip and yellow phosphor. Here, in the conventional LED lighting, since the red phosphor does not exist, the R9 value may be 0 or less. Therefore, the R9 value is raised above 0 by adding a red phosphor. However, the conventional LED lighting R11, R12 has a value of 50 or more.

In spite of the conventional solution using the red phosphor, it can be said that the conventional LED lighting has the most distortion of the color due to the R9 value.

Therefore, the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention includes an excitation light source 130 emitting a peak wavelength of 455 nm to 465 nm, and a green phosphor, which is the three primary colors of light, not the yellow phosphor. You can use to increase the value of R9. In the LED light source 100 for high color rendering vision safeguard according to an exemplary embodiment of the present invention, the green phosphor may be a second phosphor described below.

In addition, the LED light source 100 for high color rendering vision safeguard according to an embodiment of the present invention uses an excitation light source 130 emitting a peak wavelength of 455nm to 465nm and a green second phosphor, together with the R9 value. High color rendering characteristics can be improved by raising R11 and R12.

In addition, in the LED light source 1 for high color rendering vision safeguard according to an embodiment of the present invention, the first phosphor 152 is the excitation light source 130 itself even if the absorption rate for the excitation light emitted from the excitation light source 130 decreases. Since is emitting excitation light in the range of 455nm to 465nm, it is possible to minimize leakage of harmful light of less than 455nm.

In the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention, the second phosphor 154 is excited by the light of the excitation light source 130 to emit light of 500 nm to 540 nm in a green wavelength band.

The second phosphor 154 is a phosphor that emits green light, and may use any one selected from a fluorescent material represented by [Chemical Formula 3], a fluorescent material represented by [Chemical Formula 4], and a fluorescent material obtained by mixing them.

[Formula 3]

(Ba,Sr,Ca,Mg,Eu) ₂ SiO ₄

[Formula 4]

Y ₃ (Al,Ga) ₅ O ₁₂ :Ce

The second phosphor 154 may contain 8 to 13% by weight of 100% by weight including the encapsulant 150. Accordingly, the encapsulant 150 may be formed in an amount of 85 to 91.9% by weight.

In the LED light source 100 for high color rendering vision safeguard according to an embodiment of the present invention, the second phosphor 154 has excellent absorption rate for light emitted from the excitation light source 130, and is a green phosphor that feels comfortable for the eyes. Since the content is increased, the LED light source 100 for a high color rendering vision safeguard according to an exemplary embodiment of the present invention can feel a sense of stability and realize high color rendering.

In particular, in Chemical Formula 3, the magnesium (Mg) component is a material having excellent reactivity, and may emit a color close to Greenish Blue by improving the reactivity of the synthesized Chemical Formula 3 materials. In addition, in Chemical Formula 3, the magnesium (Mg) component may improve reactivity with the excitation light source 130 to increase the amount of light from 500 nm to 540 nm. Accordingly, the second phosphor 154 increases the value of R11 (Green) so that the LED light source 100 for a high color rendering vision safeguard according to an exemplary embodiment of the present invention can emit light close to natural light.

In other words, the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention uses an excitation light source 130 emitting a peak wavelength of 455nm to 465nm and a green second phosphor 154 Accordingly, the blue wavelength peak of the LED light source 100 for high color rendering vision safeguard can be shifted in the direction of a long wavelength of 455 nm or more. That is, the magnesium component of Chemical Formula 3 improves the reactivity with the excitation light source 130 to shift the blue wavelength peak in the blue-green wavelength direction in the long wavelength direction of 455 nm or more, thereby forming a color rendering index of 90 Ra or more.

In addition, since the second phosphor 154 emits light that is close to bluish green instead of the phosphor in the yellow wavelength band close to red, it is not mixed with the first phosphor 152 that emits a red wavelength band, so that R9 can be improved to 50 or more. .

2 and 3, the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention radiates through an excitation light source 130, a first phosphor 152, and a second phosphor 154. A white spectrum can be formed.

In addition, the white spectrum may have a color rendering index of 90Ra or more, and R9, which is a color rendering index of red, may be 50 or more. Here, the white spectrum emitted from the LED light source 100 according to the embodiment of the present invention was measured with an Ever Fine Spectro Meter.

Specifically, the white spectrum emitted from the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention can clearly express the color of an illuminated object as the color rendering index is measured as 92.5Ra. In addition, the white spectrum emitted from the high color rendering vision safeguard LED light source 100 can shape the clarity and reduce the fatigue of the human eye.

That is, when sunlight is viewed as 100Ra, the color rendering index of the white spectrum emitted from the LED light source 100 for high color rendering vision safeguard according to the embodiment of the present invention is measured as 92.5Ra, and artificial lighting close to natural sunlight It can be seen that In other words, it can be seen that the currently used lighting generally uses 75Ra to 85Ra products, whereas the white spectrum emitted from the LED light source 100 according to the embodiment of the present invention is the lighting that implements high color rendering. .

In addition, the white spectrum emitted from the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention was measured as R9, which is a color rendering index of red. That is, since the absorption rate of the first phosphor 152, which is a red phosphor, is high, the amount of the excitation light source 130 as it is discharged can be minimized.

Moreover, since the first phosphor 152 and the second phosphor 154 have a wide spacing in the wavelength band, color deterioration due to color mixture is prevented, so that the white spectrum can be determined to have a high color rendering index of red, R9. have.

In addition, since the excitation light source 130 is 455nm to 465nm, the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention does not have a light source through which light in the range of 400nm to 455nm harmful to the human body is leaked.

In addition, the white spectrum may have a wavelength ratio of less than 40% in the range of 415nm to 455nm, and a wavelength ratio of 100% or more in the range of 465nm to 495nm. Here, the wavelength ratio is based on sunlight, and for sunlight, the wavelength ratio in all areas is 100%.

Specifically, the “A” region shown in FIG. 2 is a wavelength region in the range of 415 nm to 455 nm, which is harmful to the human body, and the “B” region is a wavelength region from 465 nm to 495 nm, which is beneficial to the human body.

As shown in FIG. 5, the peak of the blue wavelength of the white spectrum may be formed at 450 nm to 475 nm. More specifically, the peak of the blue wavelength of the white spectrum is 455nm to 465nm, and the inclination of the spectrum is rapidly formed in the “A” region, which is a harmful wavelength region based on the peak of the blue wavelength, so that the width of the half width is narrowed. have. Therefore, it can be seen that the amount of light emitted from the “A” region, which is a harmful wavelength region, has decreased.

Here, when the peak of the blue wavelength is formed at a wavelength of 465 nm or more, the color rendering index (Ra) may be less than 90, and when the peak of the blue wavelength is formed at a wavelength of less than 455 nm, the ratio of the beneficial wavelength may be rapidly reduced. have. Therefore, it is preferable that the peak of the blue wavelength of the white spectrum is formed in the range of 455 nm to 465 nm.

On the other hand, in the “B” region, which is an advantageous wavelength region based on the peak of the blue wavelength, the slope of the spectrum is relatively gentle compared to the “A” region. It can be seen that the amount of light produced is relatively increased.

3 shows numerically the specific gravity of the light amount of the spectrum according to FIG. 2.

As shown in FIG. 3, the white spectrum of the LED light source 100 for high color rendering vision safeguard according to the embodiment of the present invention is “A”, which is a harmful wavelength range of 415 nm to 455 nm based on 100% of sunlight. The amount of light corresponding to 38% of the area was emitted. For easy comparison, in the case of OLEDs, 76% of harmful wavelengths are emitted, and in the case of generally used LEDs, a significant amount of harmful wavelengths of 121% is generated.

On the other hand, the white spectrum of the LED light source 100 for high color rendering vision safeguard according to an embodiment of the present invention corresponds to 112% based on 100% of sunlight in the “B” region, which is a harmful wavelength range of 465nm to 495nm. The amount of light was emitted.

In other words, in the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention, a person can feel comfortable as the amount of light having a wavelength that is more advantageous than sunlight increases. Also, in the case of OLED, a beneficial wavelength of 112% is emitted, and in the case of a generally used LED, a beneficial wavelength of 47% is generated.

Therefore, the white spectrum emitted from the LED light source 100 for a high color rendering vision safeguard according to an embodiment of the present invention minimizes harmful wavelengths and maximizes beneficial wavelengths to reduce eye fatigue and realize lighting that feels comfortable. .

In this way, the LED light source 100 for high color rendering vision safeguard according to an embodiment of the present invention accurately expresses the color of objects under the light of illumination, and improves the clarity, which is close to sunlight that makes the eyes less tired. High color rendering white spectrum can be implemented.

4 is a cross-sectional view schematically showing an LED light source for a high color rendering vision safeguard according to another embodiment of the present invention, and FIG. 5 is a light emission spectrum of an LED light source for a high color rendering vision safeguard according to another embodiment of the present invention. Fig. 6 is a graph showing the results of color rendering evaluation of the LED light source for high color rendering vision safeguards according to embodiments of the present invention.

4 to 6 will be described with reference to FIGS. 1 to 3 for ease of explanation and avoiding redundant description.

4 to 6, the LED light source 100-1 for a high color rendering vision safeguard according to another embodiment of the present invention includes an excitation light source 130 and phosphors 152, 153, and 154.

The phosphors 152, 153, and 154 may be dispersed and immobilized in the encapsulant 150. The phosphors 152, 153, and 154 are excited by light emitted from the excitation light source 130 to emit red light, a second phosphor 154 that emits green light, and a second phosphor that emits blue light. 3 phosphors 153 are included. The first phosphor 152, the second phosphor 154, and the third phosphor 153 are formed of fluorescent materials of different compositions.

As described above, the first phosphor 152 and the second phosphor 154 may be formed of [Chemical Formulas 1 and 2] and [Chemical Formulas 3 and 4], respectively.

In addition, the third phosphor 153 may be excited by the light of the excitation light source 130 to emit light of 480 nm to 499 nm in a blue wavelength band. The third phosphor 153 is a phosphor that emits blue light, and may be formed of a fluorescent material represented by [Chemical Formula 5]. The peak emission wavelength of the third phosphor 153 may emit longer wavelength than the peak wavelength of light emitted from the excitation light source 130.

[Formula 5]

(Ba,Eu)Si ₂ (O,Cl) ₂ N ₂

The third phosphor 153 may contain 0.1 to 2% by weight of 100% by weight including the encapsulant 150. Therefore, the first phosphor 152 has a content of 0.1 to 2% by weight, the second phosphor 152 has a content of 8 to 13% by weight, and the third phosphor 153 has a content of 0.1 to 2% by weight. And, the encapsulant 150 may be formed to have a content of 83 to 91.8% by weight.

In the LED light source 100-1 for high color rendering vision safeguard according to another embodiment of the present invention, the emission peak wavelength of the third phosphor 153 is longer than the peak wavelength of light emitted from the excitation light source 130, It is possible to increase the amount of light of beneficial wavelengths in the range of 465nm to 495nm of blue light.

5 and 6, the LED light source 100-1 for a high color rendering vision safeguard according to another embodiment of the present invention includes an excitation light source 130, a first phosphor 152, and a second phosphor 154. And a white spectrum emitted through the third phosphor 153 may be emitted.

In addition, the white spectrum may have a color rendering index of 90Ra or more, and R9, which is a color rendering index of red, may be 50 or more. Here, the white spectrum emitted from the LED light source 100-1 for high color rendering vision safeguard according to another embodiment of the present invention was measured with an Ever Fine Spectro Meter.

Specifically, the white spectrum indicated by #1 in FIG. 5 (hereinafter “the first white spectrum (#1)”) is a graph showing that the excitation light source 130 is less than 455nm to 460nm, and indicated by #2 in FIG. The white spectrum (hereinafter “second white spectrum (#2)”) is a graph showing that the excitation light source 130 is in the range of 460 nm to 465 nm.

In addition, in FIG. 6, a table showing the color rendering evaluation results of the first spectrum #1 and the second spectrum #2. Hereinafter, the excitation light source 130 forming the first white spectrum #1 is defined as a first excitation light source, and the excitation light source forming the second white spectrum #2 is defined as a second excitation light source. It is not distinguished by reference numerals.

In the first white spectrum (#1), the color rendering index was measured as 93Ra, and R9 was measured as 70. And, in the second white spectrum (#2), the color rendering index was measured as 91Ra, and R9 was measured as 73. In addition, the peaks of the blue wavelength in the first and second white spectra (#1, #2) were measured to be 455nm to 465nm.

Therefore, the first and second white spectra (#1, #2) of the high color rendering vision safeguard LED light source 100-1 according to another embodiment of the present invention have a color rendering index of 90Ra or more, and a color rendering color of red. The index R9 was measured to be over 50, indicating that it is an eye care lighting device that has high color rendering and emits a beneficial wavelength for the human eye.

Referring again to FIGS. 5 and 6, the first white spectrum (#1) uses the first excitation light source 130 of less than 455 nm to 460 nm, so that a value relatively lower than the second white spectrum (#2) in R9 is measured. Became.

This is because the reactivity of the red first phosphor 152 with respect to the first excitation light source is low, and the outflow of the first excitation light source increases, so that a blue wavelength peak may be formed in a short wavelength direction. Therefore, it is determined that R9 has a relatively lower value than the second white spectrum (#2).

Therefore, it is determined that the amount of the excitation wavelength outflow of the first excitation light source 130 that is not absorbed by the red first phosphor 152 is slightly increased. Moreover, since the first excitation light source 130 of the first white spectrum #1 is shorter than the excitation light source 130 of the second white spectrum #2, the peak in the blue wavelength band is the second white spectrum (#2). It is believed to be formed in a shorter wavelength range than the wavelength peak.

Accordingly, the blue wavelength peak of the first white spectrum #1 may be formed in a range of 455 to less than 460 nm.

Meanwhile, in the second white spectrum (#2), the second excitation light source 130 is 460 nm to 465 nm, and is disposed in a longer wavelength band than the blue wavelength peak of the first white spectrum (#1). The blue wavelength peak of may be formed in the range of 460nm to 465nm.

In addition, it is determined that the second white spectrum #2 has a relatively higher value than the first white spectrum #1 in R9. It may be determined that the red first phosphor 152 has a further increase in reactivity to the second excitation light source 130.

Accordingly, it is determined that the outflow of the second excitation light source 130 is decreased by increasing the second excitation light source 130 absorbed by the red first phosphor 152. Moreover, since the second excitation light source 130 of the second white spectrum #2 has a longer wavelength than the first excitation light source 130 of the first white spectrum #1, the peak in the blue wavelength band is the first white spectrum (#1). It is believed that it was formed in a longer wavelength range than the wavelength peak of ).

Therefore, the white spectrum emitted from the LED light source 100-1 for high color rendering vision safeguard according to another embodiment of the present invention minimizes harmful wavelengths and maximizes beneficial wavelengths to reduce eye fatigue and provide comfortable lighting. Can be implemented.

As described above, the LED light source 100-1 for a high color rendering vision safeguard according to another embodiment of the present invention accurately expresses the color of objects under the light of illumination and improves the clarity, thereby making the eyes less fatigued. High color rendering white spectrum close to light can be realized.

It will be appreciated by those skilled in the art through the above description that various changes and modifications can be made without departing from the spirit of the present specification. Therefore, the technical scope of the present specification is not limited to the content described in the detailed description of the specification, but should be determined by the scope of the claims.

100: light source 110: base substrate
130: excitation light source 150: encapsulant
152: first phosphor 153: third phosphor
154: second phosphor #1: first white spectrum
#2: 2nd white spectrum

Claims (8)

delete delete delete delete In the LED light source for high color rendering vision safeguard,
The light source,
An excitation light source that emits a wavelength of more than 460 nm to 465 nm or less; And
A plurality of phosphors excited by light provided from the excitation light source to emit light of a specific wavelength range; Including,
The phosphors,
A first phosphor having an emission wavelength of 600 to 650 nm and formed by mixing a fluorescent material represented by [Chemical Formula 1] (Sr,Ca)AlSiN ₃ :Eu and a fluorescent material represented by [Chemical Formula 2] CaAlSiN ₃ :Eu,
It has a light emission wavelength of 500 ~ 540nm, [Chemical Formula 3] (Ba,Sr,Ca,Mg,Eu) ₂ Fluorescent material represented by SiO ₄ and [Chemical Formula 4] Y ₃ (Al,Ga) ₅ O ₁₂ :Ce A second phosphor formed by mixing the expressed fluorescent material, and
It has an emission wavelength of 480 to 499 nm, and includes a third phosphor represented by [Chemical Formula 5] (Ba,Eu)Si ₂ (O,Cl) ₂ N ₂ ,
The white spectrum emitted through the excitation light source, the first phosphor, the second phosphor, and the third phosphor,
The color rendering index is more than 90Ra, R9 is 73,
Based on 100% of the wavelength ratio of sunlight, the wavelength ratio in the range of 415-455nm is less than 40%, and the wavelength ratio in the range of 465nm to 495nm is 100% or more,
The first phosphor, the second phosphor, and the third phosphor are dispersed and immobilized by a transparent resin, and the first phosphor among 100% by weight containing the first phosphor, the second phosphor, the third phosphor and the transparent resin Contains 0.1 to 2% by weight, the second phosphor contains 8 to 13% by weight, the third phosphor contains 0.1 to 2% by weight, and the transparent resin contains 83 to 91.8% by weight LED light source for high color rendering vision safeguard.
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