LED lighting system

Abstract

LED lighting device comprising: a first LED light source (10Aa, 100Aa) configured to emit a first white light having a first melanopic-photopic (M / P) ratio; a second LED light source (10Ab, 100Ab) configured to emit a second white light having a second M / P ratio; a setting LED light source (10B, 100Ba, 100Bb) configured to emit a blue setting light having a peak wavelength in the range of 465 nm to 495 nm; and a drive control unit (20) configured to control currents applied to the first LED light source (10Aa, 100Aa), the second LED light source (10Ab, 100Ab) and the setting LED light source (10B) to produce a set white light combining the first white light, the second white light and the blue setting light, the set white light being produced with a third M / P ratio,which is higher than the first M / P ratio and the second M / P ratio, wherein the first LED light source (100Aa) comprises: a first light-emitting diode (130) configured to emit a first blue light having a peak wavelength in the range of 435 nm to 465 nm, a second light-emitting diode (140) configured to emit a second blue light having a peak wavelength in the range of 465 nm to 495 nm, a first wavelength conversion material (154Aa) configured to be excited by the first and second blue light and to emit a first light having a peak wavelength in the range of 520 nm to 560 nm, and a second wavelength conversion material (156Aa) configured to be excited by the first and second blue light and to emit a second light having a peak wavelength in the range of 590 nm to 655 nmwherein the second LED light source (100Ab) comprises: a third light-emitting diode (135) configured to emit a third blue light having a peak wavelength in the range of 435 nm to 465 nm, a third wavelength conversion material (154Ab) configured to be excited by the third blue light and to emit a third light with a peak wavelength in the range of 540 nm to 560 nm and a full width at most 60 nm, and a fourth wavelength conversion material (156Ab) configured to be excited by the third blue light and to emit a fourth light with a peak wavelength in the range of 620 nm to 650 nm, wherein the first M / P ratio is in the range of 0.65 to 1.2, wherein the second M / P ratio is in the range of 0.5 to 0.62, and wherein the third M / P ratio is 2 or higher.

Description

BACKGROUND1. Area

[0001] The disclosure relates to a light-emitting diode (LED) lighting device. 2. Description of related technology

[0002] A white light-emitting device is implemented by using a plurality of wavelength conversion materials, such as phosphors, for example, green, red, or blue, yellow, and red, with an ultraviolet or blue LED chip. Regarding a white light field, there is a recent demand for a human-centric LED lighting device and a white light-emitting device for use in the human-centric LED lighting device. SUMMARY

[0003] An LED lighting system for human-centered light is being created.

[0004] According to one aspect of the disclosure, a light-emitting diode (LED) lighting device comprises a first LED light source configured to emit a first white light, and comprising: a first light-emitting diode configured to emit a first blue light having a peak wavelength in a range of 435 nm to 465 nm, a second light-emitting diode configured to emit a second blue light having a peak wavelength in a range of 465 nm to 495 nm, a first wavelength conversion material configured to be excited by the first blue light and the second blue light and to emit a first light having a peak wavelength in a range of 520 nm to 560 nm, and a second wavelength conversion material configured to be excited by the first and second blue lights and to emit a second light,which has a peak wavelength in a range of 600 nm to 645 nm; a second LED light source configured to emit a second white light, and comprising: a third light-emitting diode configured to emit a third blue light having the peak wavelength in the range of 435 nm to 465 nm, a third wavelength conversion material configured to be excited by the third blue light and emit a third light having a peak wavelength in a range of 540 nm to 560 nm and having a half-width of 60 nm or less, and a fourth wavelength conversion material configured to be excited by the third blue light and emit a fourth light having a peak wavelength in a range of 620 nm to 650 nm; an adjustment LED light source configured to emit a blue adjustment light,whose peak wavelength is in the range of 465 nm to 495 nm; and a drive control unit configured to control currents applied to the first LED light source, the second LED light source, and the adjustment LED light source, respectively, to generate an adjusted white light.

[0005] According to one aspect of the disclosure, an LED lighting device comprises a first LED light source configured to emit a first white light, and comprising: a first light-emitting diode configured to emit a first blue light having a peak wavelength in a range of 435 nm to 465 nm, a second light-emitting diode configured to emit a second blue light having a peak wavelength in a range of 465 nm to 495 nm, a first wavelength conversion material configured to be excited by the first and second blue lights and to emit a first light having a peak wavelength in a range of 520 nm to 560 nm, and a second wavelength conversion material configured to be excited by the first and second blue lights and to emit a second light having a peak wavelength in a range of 600 nm to 645 nm;a second LED light source configured to emit a second white light, and comprising: a third light-emitting diode configured to emit a third blue light having the peak wavelength in the range of 435 nm to 465 nm, a third wavelength conversion material configured to be excited by the third blue light and emit a third light having a peak wavelength in a range of 540 nm to 560 nm and having a half-width of 60 nm or less, and a fourth wavelength conversion material configured to be excited by the third blue light and emit a fourth light having a peak wavelength in a range of 620 nm to 650 nm; and a drive control unit configured to control currents applied to the first LED light source and the second LED light source, respectively, to generate an adjusted white light.

[0006] According to one aspect of the disclosure, an LED lighting device includes an LED light source configured to emit a white light having a first melanopic-photopic (M / P) ratio; an adjustment LED light source configured to emit a blue adjustment light having a peak wavelength in a range of 465 nm to 495 nm; and a drive control unit configured to control currents applied to the LED light source and the adjustment LED light source, respectively, to generate an adjusted white light having a second M / P ratio higher than the first M / P ratio.

[0007] According to one aspect of the disclosure, an LED lighting device comprises at least two of a first LED light source configured to emit a first white light, a second LED light source configured to emit a second white light, and an adjustment LED light source configured to emit a blue adjustment light; and a drive control unit configured to control currents respectively applied to the at least two of the first LED light source, the second LED light source, and the adjustment LED light source to generate an adjusted white light comprising a combination of at least two of the first white light, the second white light, and the blue adjustment light, wherein the first LED light source comprises: a first light-emitting diode configured to emit a first blue light having a peak wavelength in a range of 435 nm to 465 nm,a second light-emitting diode configured to emit a second blue light having a peak wavelength in a range of 465 nm to 495 nm, a first wavelength conversion material configured to be excited by the first blue light and the second blue light and to emit a first light having a peak wavelength in a range of 520 nm to 560 nm, and a second wavelength conversion material configured to be excited by the first and second blue lights and to emit a second light having a peak wavelength in a range of 600 nm to 645 nm, wherein the second LED light source comprises: a third light-emitting diode configured to emit a third blue light having the peak wavelength in the range of 435 nm to 465 nm, a third wavelength conversion material configured,to be excited by the third blue light and to emit a third light having a peak wavelength in a range of 540 nm to 560 nm and a half-width of 60 nm or less, and a fourth wavelength conversion material configured to be excited by the third blue light and to emit a fourth light having a peak wavelength in a range of 620 nm to 650 nm, and wherein the adjustment LED light source is configured to emit the blue adjustment light whose peak wavelength is in the range of 465 nm to 495 nm. List of characters

[0008] The foregoing and other aspects, features, and advantages of certain embodiments of the present disclosure will become apparent from the following description taken in conjunction with the accompanying drawings. Fig. 1 is a block diagram of an LED lighting device according to an embodiment; Fig. 2A and Fig. 2B illustrates cross-sectional views of light-emitting devices each usable in an LED light source, according to one embodiment; Fig. 2C is a graph showing emission spectra of wavelength conversion materials measured at a Fig. 2B, according to one embodiment; Fig. 3A and Fig. 3B Cross-sectional views of light-emitting devices, each at a Fig. 1 illustrated adjusting LED light source, according to one embodiment; Fig. 4A and Fig. 4B Cross-sectional views of LED chips used in Fig. 2A to Fig. 3B, according to one embodiment; Fig. 5 is a graph illustrating emission spectra of a white light D and a blue adjustment light M emitted respectively from an LED light source and an adjustment LED light source of an LED lighting device, according to an embodiment; Fig. 6 is a graph illustrating emission spectra of a tuned white light emitted from an LED lighting device according to an embodiment; Fig. 7 is a graph illustrating emission spectra of a white light N and a blue adjustment light M emitted from an LED light source and an adjustment LED light source of an LED lighting device, respectively, according to an embodiment; Fig. 8 is a graph illustrating emission spectra of a tuned white light emitted from an LED lighting device, according to an embodiment; Fig. 9 is a block diagram of an LED lighting device according to an embodiment; Fig. 10A is a graph illustrating emission spectra of a first white light D and a second white light N, respectively emitted by a first LED light source and a second LED light source of a Fig. 9, according to one embodiment; Fig. 10B is a graph illustrating selective control of a first LED light source and a second LED light source of a Fig. 9 shows the LED lighting device according to an embodiment; Fig. 11 is a graph showing emission spectra of adjusted white lights emitted by a Fig. 9, according to one embodiment; Fig. 12 is a graph showing emission spectra of second white lights of a light-emitting device usable as a second LED light source used in Fig. 9, according to one embodiment; Fig. 13 is a block diagram of an LED lighting device according to an embodiment; Fig. 14 is a graph illustrating a first white light D, a second white light N and a blue modeling light M respectively emitted by a first LED light source, a second LED light source and a modeling LED light source of a Fig. 13, according to one embodiment; Fig. 15 is a graph showing emission spectra of a controlled white light emitted by a Fig. 13, according to one embodiment; DETAILED DESCRIPTION

[0009] Exemplary embodiments are described below with reference to the accompanying drawings.

[0010] As is common in the art, embodiments may be described and illustrated in terms of blocks that perform a described function or functions. These blocks, which may be referred to herein as units or modules or the like, or by terms such as driver, controller, device, or the like, may be physically implemented by analog or digital circuits, such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive electronic components, active electronic components, optical components, hard-wired circuits, or the like, and may be controlled by firmware and software. These circuits may, for example, be formed in one or more semiconductor chips or on substrate carriers such as printed circuit boards and the like. Circuits included in a block implemented by dedicated hardware or by a processor (e.g.,One or more programmed microprocessors and associated circuits), or by a combination of dedicated hardware to perform some functions of the block and a processor to perform other functions of the block. Each block of the embodiments can be physically divided into two or more cooperating and discrete blocks. Likewise, the blocks of the embodiments can be physically combined into more complex blocks.

[0011] Fig. 1 is a block diagram of an LED lighting device according to an exemplary embodiment.

[0012] Referring to Fig. 1, an LED lighting device according to an exemplary embodiment may include a light source unit 10, a drive control unit 20, and a power supply unit 30. The light source unit 10 may be configured as a separate module, or the light source unit 10 and the drive control unit 20 may be configured as a single module.

[0013] The light source unit 10 may include an LED light source 10A and an adjustment LED light source 10B. The LED light source 10A and the adjustment LED light source 10B may be operated independently using applied currents I1 and I2, respectively. The LED light source 10A may emit a white light having a correlated color temperature (CCT). For example, the LED light source 10A may emit a white light having a color temperature in a range of 1,800 K to 6,500 K. In another embodiment, the LED light source 10A may be provided as two or more LED light sources emitting white lights having different color temperatures. The adjustment LED light source 10B may have an intensity in a melanopically sensitive range defined in Fig. 5 and other figures, as explained below, can adjust the white light emitted from the LED light source 10A. Accordingly, the light source unit 10 can emit a white light by adjusting the intensity of the melanopically sensitive area that affects human circadian rhythms.

[0014] The drive control unit 20 may include a drive signal control unit 21 and a light source drive unit 25. The drive signal control unit 21 may transmit a drive signal of the light source unit 10 to the light source drive unit 25. The drive signal control unit 21 may control currents I1 and I2 supplied from the light source drive unit 25 to the light source unit 10. The light source drive unit 25 may include a first drive unit 25A that can drive the LED light source 10A and a second drive unit 25B that can drive the adjustment LED light source 10B. The first drive unit 25A and the second drive unit 25B may, for example, supply the currents I1 and I2 controlled by the drive signal of the drive signal control unit 21 to the LED light source 10A and the adjustment LED light source 10B.The light source driving unit 25 can receive AC or DC power from the power supply unit 30.

[0015] As an example, the drive control unit 20 may further include a communication module that sends and receives data about color properties, for example, a measured color temperature inside or outside the LED lighting device. The drive control unit 20 may further include a signal processing unit that processes data from an illuminance sensor, a motion sensor, and / or an image sensor and sends and receives the processed data to and from the interior or surroundings of the drive control unit 20.

[0016] In an exemplary embodiment, the LED illumination device may include an LED light source configured to emit white light having a first melanopic-photopic (M / P) ratio, an adjustment LED light source configured to emit a blue adjustment light having a peak wavelength ranging from 465 nm (nanometers or one billionth of a meter) to 495 nm, and a drive control unit that drives currents applied to the LED light source and the adjustment LED light source, respectively, to generate an adjusted white light having a second M / P ratio that is higher than the first M / P ratio. Depending on the configuration of the LED light source, the first M / P ratio may range from about 0.2 to 1.2, for example, when the first and second light-emitting devices are made of Fig. 2A and Fig. 2B, an example of which is presented as Example 3, or it may range from about 0.6 to 1.2, for example when the first light-emitting device is made of Fig. 2A, an example of which is presented as Example 1, or it may range from 0.1 to 0.7, for example when the second light-emitting device is comprised of Fig. 2B, an example of which is presented as Example 2. Furthermore, the second M / P ratio, which corresponds to the first M / P ratio, may range from 0.3 to 2.6, for example as shown in Example 4, or it may range from about 0.6 to 2.5, for example as shown in Example 1, or from 0.2 to 2.6, for example as shown in Example 2.

[0017] In one embodiment, when a light is described as having a peak wavelength that "ranges" from a first wavelength to a second wavelength, this may mean that the light may have a peak wavelength that is in a range from or within a range of the first wavelength to the second wavelength, and may therefore be any wavelength between the first wavelength and the second wavelength inclusive.

[0018] In the following, a light-emitting device usable in the LED light source 10A will be described with reference to Fig. 2A to Fig. 2C together with Fig. 1 described.

[0019] Fig. 2A and Fig. 2B are cross-sectional views of light-emitting devices 100Aa and 100Ab, each of which is used in an LED light source, for example, LED light source 10A, in the embodiment of Fig. 1, can be used, and Fig. Figure 2C is a graph showing emission spectra of wavelength conversion materials used in the light-emitting device of Fig. 2B. The LED light source made of Fig. 1 may include at least a first light-emitting device 100Aa and a second light-emitting device 100Ab, each emitting first and second white light having different color temperatures, M / P ratios, and the like.

[0020] Referring to Fig. 2A, an LED light source or a first LED light source may include a first white light emitting device 100Aa that emits white light with a first M / P ratio, which may be, for example, 0.6 to 1.2, as shown in Example 1. The first white light emitting device 100Aa may include a package substrate 110, a sidewall reflection unit 120, a first light-emitting diode 130, a second light-emitting diode 140, and a wavelength conversion unit 150Aa.

[0021] The package substrate 110 may include first and second electrode structures 111 and 112 electrically connected to the first and second light-emitting diodes 130 and 140. The package substrate 110 may be molded using an opaque resin or a resin with a high reflectivity, may facilitate an injection process, and may comprise a polymer resin including a highly reflective powder. In embodiments, the package substrate 110 may be formed of ceramic. In this case, heat can be easily dissipated. As an example, the package substrate 110 may be a printed circuit board on which an interconnection pattern replacing the first and second electrode structures 111 and 112 is formed.

[0022] The sidewall reflection unit 120 may be disposed on the package substrate 110 and may have a cavity that accommodates the first and second light-emitting diodes 130 and 140. The sidewall reflection unit 120 may have a cup shape to improve light reflection efficiency, but example embodiments are not limited thereto. For example, the sidewall reflection unit 120 may be formed to be integrated with the package substrate 110. The sidewall reflection unit 120 and the package substrate 110 may be formed, for example, from the same material, for example, a resin containing highly reflective white powder, by the same process, for example, an injection molding process.

[0023] The first and second light-emitting diodes 130 and 140 may be electrically connected to the first and second electrode structures 111 and 112, respectively. In an exemplary embodiment, the first and second light-emitting diodes 130 and 140 are electrically connected to the first and second electrode structures 111 and 112, respectively, by a conductive wire W, but exemplary embodiments are not limited thereto, and the first and second light-emitting diodes 130 and 140 may each be connected in a flip-chip manner. The first light-emitting diode 130 may be configured to emit a first blue light having a peak wavelength ranging from 435 nm to 465 nm, and the second light-emitting diode 140 may be configured to emit a second blue light having a peak wavelength ranging from 465 nm to 495 nm.

[0024] The wavelength conversion unit 150Aa may include a light-transmitting resin 152Aa and first and second wavelength conversion materials 154Aa and 156Aa. The light-transmitting resin 152Aa may be formed from epoxy, silicon, modified silicone, urethane resin, an oxetane resin, acrylic resin, polycarbonate, polyimide, and combinations thereof. The first and second wavelength conversion materials 154Aa and 156Aa may be excited by the first and second blue lights generated by the first and second light-emitting diodes 130 and 140 to emit light having wavelengths other than those of the first and second blue lights.For example, the first wavelength conversion material 154Aa may be excited by the first and / or second blue light to emit a first light having a peak wavelength of 520 nm to 560 nm, and the second wavelength conversion material 156Aa may be excited by the first and / or second blue light to emit a second light having a peak wavelength of 600 nm to 645 nm. The first wavelength conversion material 154Aa may comprise at least one phosphor selected from the group consisting of, for example, (Ga, Gd, Y). 2 Al 5 O 12 :Ce, La 3 Si 6 Ni:Ce, (Sr,Ca,Ba)Si 2 O 2 N 2 :Eu, (Sr,Ba)Si 2 O 4 :Eu, and combinations thereof. The second wavelength conversion material may comprise at least one phosphor selected from the group consisting of, for example, (Sr,Ca)AlSiN 3 :Eu, CaAlSiN 3 :Eu, K x SiF y:Mn 4+ (where 2≤x≤3 and where 4≤y≤7), α-SiAlON:Eu, SrAl 2 Li 2 O 2 N 2 , MGF:Mn 4+ is selected, and combinations thereof. The first and / or second wavelength conversion materials 154Aa and 156Aa may have an excitation efficiency achieved by the first blue light that is higher than an excitation efficiency achieved by the second blue light. In an exemplary embodiment, the first and second wavelength conversion materials 154Aa and 156Aa may be dispersed in the light-transmitting resin 152Aa, but exemplary embodiments are not limited thereto. In one example, the first and second wavelength conversion materials 154Aa and 156Aa may be formed to be surrounded by surfaces of the first and second light-emitting diodes 130 and 140.

[0025] The first white light-emitting device 100Aa may emit a first white light by combining first and second lights converted by the first and second wavelength conversion materials 154Aa and 156Aa, and other unconverted first and second blue lights. In an exemplary embodiment, the first white light may be configured to have an emission spectrum that satisfies a specific condition considering blue light hazard (BLH), a circadian rhythm, and the like. An example of this will be described in detail with reference to Example 3 below.

[0026] Referring to Fig. 2B, an LED light source or a second LED light source 100Ab may comprise a second white light-emitting device that emits a second white light with a first M / P ratio, which may, for example, be in a range of 0.1 to 0.7, as shown in Example 2. The second light-emitting device 100Ab may comprise a package substrate 110, a sidewall reflection unit 120, at least one third light-emitting diode 135, and a wavelength conversion unit 150Ab. The second white light-emitting device 100Ab may, for example, comprise one or two third light-emitting diodes 135 having a peak wavelength in a range of 435 nm to 465 nm. Components other than the wavelength conversion unit 150Ab have the same or similar features as those of Fig. 2A, which are designated by the same reference numerals, so that a duplicate description is omitted.

[0027] The wavelength conversion unit 150Ab may include a light-transmitting resin 152Ab and third and fourth wavelength conversion materials 154Ab and 156Ab. The third and fourth wavelength conversion materials 154Ab and 156Ab may be excited by a third blue light generated by the third light-emitting diode 135 to emit light having wavelengths different from a wavelength of the third blue light. For example, the third wavelength conversion material 154Ab may be excited by the third blue light to emit a third light having a peak wavelength in a range of 540 nm to 560 nm and a half-width of 60 nm or less, and the fourth wavelength conversion material 156Ab may be excited by the third blue light to emit a fourth light having a peak wavelength in a range of 620 nm to 650 nm.The third blue light generated by the third light-emitting diode 135 may have a peak wavelength in a range of 435 nm to 465 nm.

[0028] The third wavelength conversion material 154Ab may be configured to emit green light having a slightly higher peak wavelength than a conventional green wavelength conversion material, so as to reduce a range from 465 nm to 495 nm in a spectrum of a final white light. The third wavelength conversion material 154Ab may, for example, be β-S 6-z Al z O z N 8-z :Eu 2+ z (where 0.01≤z≤5.99), which may also be referred to as “β-SiAlON” phosphor. Referring to Fig. 2C, a spectrum G1 formed by the β-SiAlON phosphor may have a narrower half-width, for example, about 60 nm or more, than a half-width, for example, about 60 nm or more, of a spectrum G2 formed by another green phosphor, for example, silicate phosphor. The spectrum G1 formed by the β-SiAlON phosphor may have a half-width of about 60 nm or less, for example, about 60 nm to 35 nm or between about 60 nm and 45 nm. As described above, in an exemplary embodiment, the third wavelength conversion material 154Ab having a half-width of 60 nm or less may be used to sufficiently reduce the intensity of the region from 465 nm to 495 nm in a white light spectrum of the LED light source. The spectrum G1, on the other hand, formed by the β-SiAlON phosphor, can have a significantly low intensity at a wavelength of 480 nm.For example, the third wavelength conversion material 154Ab may have an emission spectrum with an intensity of 10% or less, or 5% or less, and further a low intensity of 2% or less, compared to the peak intensity at a wavelength of 480 nm. The third wavelength conversion material 154Ab may include a ceramic phosphor and / or a quantum dot that meets the peak wavelength and half-width conditions described above, except for the β-SiAlON phosphor. Quantum dots may include, for example, InP / ZnS, InP / ZnSe, CdSe / CdS, CdSe / ZnS, PbS / ZnS, InP / ZnSe / ZnS, InP / GaP / ZnS, and combinations thereof.

[0029] The fourth wavelength conversion material 156Ab may be selected as a material to compensate for a color rendering index of the final white light. For example, a fourth light emitted from the fourth wavelength conversion material 156Ab may have a peak wavelength ranging from 620 nm to 650 nm and a half-width of 60 nm or less. A red phosphor or a quantum dot that meets such wavelength conditions may be used as the fourth wavelength conversion material 156Ab. The fourth wavelength conversion material 156Ab may include at least one phosphor selected from the group consisting of (Sr,Ca)AlSiN 3 :Eu, CaAlSiN 3 :Eu and a combination thereof.

[0030] The second white light-emitting device 100Ab may emit a second white light combining the third and fourth lights converted by the third and fourth wavelength conversion materials 154Ab and 156Ab and another unconverted third blue light. In an exemplary embodiment, the second white light may be configured to have an emission spectrum that meets a specific condition, taking into account a color rendering index, a circadian rhythm, and the like. An example of this will be described in detail with reference to Example 3 below.

[0031] Fig. 3A and Fig. 3B are cross-sectional views of light-emitting devices 100Ba and 100Bb respectively used in an adjusting LED light source 10B in the embodiment of Fig. 1 can be used.

[0032] Referring to Fig. 3A, in an exemplary embodiment, an adjustment LED light source, for example, an adjustment LED light source 10B, may include an adjustment light-emitting device 100Ba that emits a blue adjustment light having a peak wavelength in a range of 465 nm to 495 nm. The adjustment light-emitting device 100Ba may include a light-emitting diode 130Ba that emits a blue adjustment light having a peak wavelength in a range of 465 nm to 495 nm, and may be configured such that a wavelength conversion material is not included in a light-transmitting resin 152Ba covering the light-emitting diode 130Ba. Accordingly, an adjustment LED light source may use a blue light having a peak wavelength in a range of 465 nm to 495 nm emitted from the light-emitting diode 130Ba as blue adjustment light without wavelength conversion.The light-emitting diode 130Ba may include a first conductivity type semiconductor layer and a second conductivity type semiconductor layer arranged sequentially, and an active layer arranged between the first and second conductivity type semiconductor layers. In an exemplary embodiment, the first conductivity type semiconductor layer and the second conductivity type semiconductor layer may include semiconductor layers with different conductivity types, and the active layer may be a quantum well layer containing In. x Ga 1-x N (where 0 <x≤1) umfasst. Die Halbleiterschicht des ersten Leitfähigkeitstyps und die Halbleiterschicht des zweiten Leitfähigkeitstyps können zum Beispiel jeweils ein n-leitender und ein p-leitender Nitridhalbleiter sein, und die aktive Schicht kann eine Quantentopfschicht sein, die In x Ga 1-xN (where 0.215 <x<0,427) umfasst. Da die ein Einstelllicht emittierende Vorrichtung 100Ba aus Fig. 3A has the same or similar properties as the light-emitting device 100Aa of Fig. 2A, except that no additional wavelength conversion material is included, repeated description is omitted.

[0033] Referring to Fig. 3B, in an exemplary embodiment, an adjustment LED light source may include a light-emitting diode 130Bb that emits a blue light having a peak wavelength in a range of 435 nm to 465 nm, and a wavelength conversion unit 150Bb that includes a wavelength conversion material 156Bb that is excited by the blue light to emit a blue adjustment light having a peak wavelength in a range of 465 nm to 495 nm. A light-emitting diode 130Bb may have an indium content in the active layer in the light-emitting diode 130Ba of Fig. 3A so that it emits the blue light with a peak wavelength in a range of 435 nm to 465 nm. The wavelength conversion material 156Bb may be provided dispersed in a light-transmitting resin 152Bb. The wavelength conversion material 156Bb may comprise a phosphor selected from a group consisting of NaK(Li 3 SiO 4 ):Eu, (Sr,Ca,Ba)Si 2 O 2 N 2 :Eu and (Sr,Ba) 10( PO 4 ) 6 Cl 2 :Eu is selected.

[0034] An adjustable LED light source can provide blue light with a peak wavelength in a range of 435 nm to 465 nm to adjust the intensity of a spectrum in a melanopically sensitive range. When the adjustable LED light source is combined with the first LED light source and / or the second LED light source, Fig. 2A and Fig. 2B, the adjustable LED light source may also provide blue light with a predetermined range of intensity. For example, the adjustable LED light source may provide blue light having a peak intensity ranging from 10% to 5300%, compared to a peak intensity of blue light with a peak wavelength ranging from 435 nm to 465 nm, which may be the first and third blue lights described above. An exemplary embodiment may provide a human-centric LED lighting device that takes a human circadian rhythm into account by using an LED light source and an adjustable LED light source that meet specific conditions.An LED lighting device according to an exemplary embodiment may have various adjustment ranges of an M / P ratio, a color rendering index (CRI), and a correlated color temperature (CCT) to provide white light that takes into account not only an hour of human activity, for example, day and night, but also an environment, such as another room or outdoor light, or a purpose of an activity.

[0035] Fig. 4A and Fig. 4B are cross-sectional views of light-emitting diode chips 40A and 40B used in the light-emitting devices of Fig. 2A to Fig. 3B can be used.

[0036] Referring to Fig. 4A, as an example, a light-emitting diode chip 40A may include a substrate 41, a semiconductor stack S, and a pair of electrodes, for example, a first electrode 48 and a second electrode 49. The substrate 41 may be an insulating substrate such as sapphire. However, exemplary embodiments are not limited thereto, and the substrate 41 may be a conductive or a semiconductor substrate. The substrate 41 may, for example, besides sapphire, SiC, Si, MgAl 2 O 4 , MgO, LiAlO 2 , LiGaO 2 or GaN. An unevenness P may be formed on an upper surface of the substrate 41. The unevenness P can improve the quality of single crystal growth while improving light extraction efficiency.

[0037] The semiconductor stack S may include a semiconductor layer 44 of a first conductivity type, an active layer 45, and a semiconductor layer 46 of a second conductivity type, which are sequentially stacked on the substrate 41. A buffer layer 42 may additionally be arranged between the substrate 41 and the semiconductor layer 44 of the first conductivity type. The buffer layer 42 may comprise undoped In x Al y Ga 1-x-y N (where 0≤x≤1, 0≤y≤1). The buffer layer 42 may be, for example, GaN, AlN, AlGaN, or InGaN, and may be used by combining a plurality of layers or gradually changing a composition. The first conductivity type semiconductor layer 44 may be a nitride semiconductor comprising n-type In x Al y Ga 1-x-yN (where 0≤x≤1, 0≤y<1 and 0≤x+y<1), and n-type impurities may be silicon (Si). For example, the first conductivity type semiconductor layer 44 may comprise n-type GaN. The second conductivity type semiconductor layer 46 may be a nitride semiconductor layer comprising In x Al y Ga 1-x-y N satisfies p-type (where 0≤x<1, 0≤y<1, and 0≤x+y<1), and p-type impurities may be magnesium (Mg). For example, the second conductivity type semiconductor layer 46 may be implemented to have a single-layer structure, but it may have a multilayer structure with different compositions. The active layer 45 may have a multiple quantum well (MQW) structure in which a quantum well layer and a quantum barrier layer are alternately stacked. The quantum well layer and the quantum barrier layer may, for example, be In x Al y Ga 1-x-yN (where 0≤x≤1, 0≤y≤1 and 0≤x+y≤1) with different compositions. For example, the quantum well layer In x Ga 1-x N (where 0 <x≤1) und die Quantensperrschicht kann GaN oder AlGaN sein. Eine jeweilige Dicke der Quantentopfschicht und der Quantensperrschicht kann innerhalb eines Bereichs von 1 nm bis 50 nm liegen. Die aktive Schicht 45 ist nicht auf eine mehrfache Quantentopfstruktur beschränkt und kann eine einfache Quantentopfstruktur aufweisen.

[0038] The first and second electrodes 48 and 49 may each be disposed in a mesa-etched region of the first conductivity type semiconductor layer 44 and the second conductivity type semiconductor layer 46 so that they are disposed on the same surface. The first electrode 48 may comprise a material such as, but not limited to, Ag, Ni, Al, Cr, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, and may be employed as a structure comprising a single layer or two or more layers. The second electrode 49 may, for example, be a transparent electrode such as a transparent conductive oxide or a transparent conductive nitride, or it may comprise graphene. The second electrode 39 may comprise at least one of Al, Au, Cr, Ni, Ti, and Sn.

[0039] Referring to Fig. 4B, as an example, the light-emitting diode chip 40B can be considered similar to that shown in Fig. 4A, except for an electrode-related structure. Descriptions of components in the present example may refer to the descriptions of the same (or similar) components as those shown in Fig. 4A, unless otherwise specified. The light-emitting diode chip 40B may include first and second electrodes 48 and 49, respectively connected to semiconductor layers 44 and 46 of a first and second conductivity type.

[0040] The first electrode 48 may include a connecting electrode portion 48a connected to a semiconductor layer 44 of a first conductivity type through a semiconductor layer 46 of a second semiconductor layer and an active layer 45, and a first electrode pad 48b connected to the connecting electrode portion 48a. The connecting electrode portion 48a may have the same structure as a conductive connecting contact. The connecting electrode portion 48a may be surrounded by an insulating portion 47 to be electrically separated from the active layer 45 and the semiconductor layer 46 of the second conductivity type. The connecting electrode portion 48a may be arranged in a region in which the semiconductor stack S is etched.The number, shape, spacing, and contact area of ​​the connecting electrode portion 48a with the first conductivity type semiconductor layer 44 can be suitably designed to reduce contact resistance. Furthermore, the connecting electrode portions 48a can be arranged to form rows and columns on the semiconductor stack S to improve current flow.

[0041] The second electrode 49 may include an ohmic contact layer 49a on the second conductivity-type semiconductor layer 46 and a second electrode pad 49b. Both the connecting electrode portion 48a and the ohmic contact layer 49a may have a single-layer structure and a multi-layer structure including the first and second conductivity-type semiconductor layers 44 and 46 and a conductive material having ohmic properties. The second electrode 49 may be formed, for example, by depositing or sputtering at least one metal, such as Ag, Al, Ni, and Cr, and a transparent conductive oxide (TCO) such as ITO. The first and second electrode pads 48 and 49 may be connected to the connecting electrode portion 48a and the ohmic contact layer 49a, respectively, which serve as external terminals of the light-emitting diode chip 40B.The first and second electrode pads 48b and 49b may comprise, for example, Au, Ag, Al, Ti, W, Cu, Sn, Ni, Pt, Cr, NiSn, TiW, AuSn or eutectic materials thereof.

[0042] The first and second electrodes 48 and 49 may be arranged in the same direction and may be mounted on a lead frame or the like in a so-called "flip-chip" manner. The two electrodes 48 and 49 may be electrically separated from each other by the insulating portion 47. The insulating portion 47 may employ any material having electrically insulating properties and may employ any object as long as it has electrical insulation, but may employ a material having low light absorption. The insulating portion 47 may employ, for example, silicon oxide or silicon nitride. The insulating portion 47 may, for example, disperse a light-reflecting powder in a light-transmitting material to form a light-reflecting structure.In embodiments, the insulating portion 47 may have a multilayer reflective structure in which a plurality of insulating layers with different refractive indices are alternately stacked. The insulating portion 47 may be, for example, a distributed Bragg reflector (DBR) in which a first insulating layer with a first refractive index and a second insulating layer with a second refractive index are alternately stacked. In the multilayer reflective structure, a plurality of insulating layers with different refractive indices may be repeatedly stacked 2 to 100 times, for example, 3 to 70 times, or for example, 4 to 50 times. In the multilayer reflective structure, each of the plurality of insulating layers may be an oxide or a nitride, such as SiO. 2 , SiN, SiO x N y , TiO 2 , Si 3 N 4 , Al 2 O 3 , TiN, AlN, ZrO2 , TiAlN and TiSiN and combinations thereof. The refractive index of the first insulating layer and the second insulating layer can be determined in the range of 1.4 to about 2.5 and can be less than a refractive index of the first conductivity type semiconductor layer 44 and a refractive index of the substrate 41. In embodiments, the refractive index of the first insulating layer and the second insulating layer can be less than the refractive index of the first conductivity type semiconductor layer 44 but greater than the refractive index of the substrate 41. Example 1

[0043] Herein, features of the LED lighting device according to Example 1 are described with reference to Fig. 5 and Fig. 6 described in detail. Fig. 5 is a graph illustrating emission spectra of a white light D and a blue modeling light M emitted from an LED light source and a modeling LED light source of the LED lighting device, respectively, according to Example 1. Fig. 6 is a graph illustrating emission spectra A1, A2, A3, A4, A5, A6, A7, A8, A9 and A10 of adjusted white lights emitted from the LED lighting device according to the embodiment of Fig. 5. Fig. Figure 5 shows emission spectra of white light D with a correlated color temperature of 6,500 K and blue modeling light M with a peak intensity of 480 nm.

[0044] Referring to Fig. 5, Example 1 may include a first LED light source, for example, a light-emitting device 100Aa as shown in Fig. 2A, and an adjusting LED light source, for example, light-emitting devices 100Ba or 100Bb as shown in Fig. <h2 style=";text-align:left;direction:ltr">3A or<h2 style=";text-align:left;direction:ltr"> Fig. 3B. The first LED light source may have two peak intensities in a melanopically sensitive region MS and may be configured to emit a first white light D with a color rendering index adjusted by a wavelength conversion material. The adjustment LED light source may be configured to emit a blue adjustment light M with a peak intensity in the melanopically sensitive region MS. The first LED light source may, for example, emit a first blue light having a peak wavelength in a range of 435 nm to 465 nm and a first white light D combining a first light having a peak wavelength of 520 nm to 560 nm and a second light having a peak wavelength of 590 nm to 655 nm. In addition, the adjustment LED light source may, for example, emit a blue adjustment light M with a peak wavelength in a range of 465 nm to 495 nm.In Example 1, the drive control unit, for example a drive control unit 20 from . Fig. 1, control the first LED light source and the adjustment LED light source to generate an adjusted white light in which the first white light D and the blue adjustment light M are combined. The adjusted white light of Example 1 can have an emission spectrum with a significantly increased M / P ratio. In the following, properties of the adjusted white light of Example 1 are described with reference to Fig. 6 and Tables 1 to 3 together.

[0045] The adjusted white light of Example 1 may have a correlated color temperature (CCT) in a range of 3,000 K to 20,000 K, a color rendering index (CRI) ranging from about 30 to 85, and an M / P ratio ranging from about 0.6 to 2.5. In the spectrum of the adjusted white light of Example 1, a ratio SB / B of a peak intensity SB of the second blue light to the peak intensity B of the first blue light may be in the range of 1 to 20, and a ratio P / B of a maximum peak intensity P in a band of 530 nm to 680 nm to the peak intensity B of the first blue light may be in the range of 0.5 to 3.5. In Example 1, a first M / P ratio of the first white light of the first LED light source may be in the range of 0.6 to 1.2 or about 0.65 to 1.2 and a second M / P ratio of the adjusted white light of the first LED light source may be in the range of about 0.6 to 2.5.When the second M / P ratio of the adjusted white light is significantly increased, the second M / P ratio of the adjusted white light may be 1.2 or more, or 2 or more. For example, the second M / P ratio of the adjusted white light of Example 1 may be about 1.2 to 2.4, or about 2 to 2.4, or about 2.1 to 2.35.

[0046] The above values ​​were calculated in a test example as follows. A spectrum of a tuned white light was designed by combining a first white light D in which a first blue light with a peak wavelength of 450 nm, a second blue light with a peak wavelength of 480 nm, a first light with a peak wavelength in a range of 520 nm to 560 nm, and a second light with a peak wavelength in a range of 590 nm to 655 nm are combined with a blue tuning light with a peak wavelength of 480 nm. In this case, a correlated color temperature of the first white light D was determined to be 3,000 K, 3,500 K, 4,000 K, 5,000 K, 5,700 K, and 6.500 K, and an intensity SB of the blue modeling light to an intensity of the first blue light was changed in the range of 0 to 20 at each of the correlated color temperatures of the first white light D to measure and calculate a correlated color temperature (CCI), an M / P ratio (M / P), and a color rendering index (CRI) of the modeled white light, a ratio SB / B of peak intensity SB of the blue modeling light to peak intensity B of the first blue light, and a ratio P / B of a maximum peak intensity P in the band from 530 nm to 680 nm to the peak intensity B of the first blue light. The ratio P / B of the maximum peak intensity P in the band from 530 nm to 680 nm to the peak intensity B of the first blue light is a maximum peak intensity P in the range from 530 nm to 680 nm, measured assuming that the peak intensity B of the first blue light is 1.Some test examples in which upper and / or lower limits of the properties of the adjusted white light were shown are listed in Tables 1 to 3 below.

[0047] Fig. 6 shows, in the above test example, spectra A1, A2, A3, A4, A5, A6, A7, A8, A9, and A10 of white light that were adjusted while setting the correlated color temperature of the first white light D to 3000 K and changing the relative intensity SB of the blue modeling light to 0, 0.1, 0.5, 1.1, 2.2, 4.4, 6.6, 8.8, 13.1, 17.5, and 19.7. Zero (0) was included in the relative intensity SB of the blue modeling light to check optical properties such as the correlated color temperature and the like of the first white light D before adjusting the white light. In addition, correlated color temperatures and the like were determined for spectra A1, A2, A3, A4, A5, A6, A7, A8, A9, and A10. Fig. 6 and listed in Table 1. In addition, correlated color temperatures and the like of spectra of white light adjusted while setting correlated color temperatures of the first white light D to 5,000 K and 6,500 K and changing the relative intensity SB of the blue modeling light were measured and listed in Tables 2 and 3. In Tables 2 and 3, calculation of spectra and measurement of optical properties were performed in the same manner as in Fig. 6 and Table 1. Table 1 D(CCT) SB CCT M / P CRI SB / B P / B 3.000 K 0 3.069 0,65 84,1 2,2 3,3 0,1 3.079 0,65 84,0 2,2 3,3 0,5 3.189 0,72 83,0 2,7 3,3 1,1 3.317 0,78 81,6 3,2 3,3 2,2 3.596 0,90 77,8 4,2 3,2 4,4 4.260 1,14 69,0 6,2 3,2 6,6 5.087 1,35 61,1 8,2 3,1 8,8 6.097 1,55 53,4 10,0 3,0 13,1 8.829 1,90 41,8 13,5 2,9 17,5 13.246 2,21 34,2 16,8 2,8 19,7 16.798 2,34 31,4 18,3 2,8 Table 2 D(CCT) SB CCT M / P CRI SB / B P / B 5.000 K 0 5.018 1,03 83,6 1,6 1,0 0,39 5.457 1,14 80,7 1,9 1,0 0,77 5.940 1,25 77,2 2,3 1,0 1,5 7.049 1,45 70,4 3,0 1,0 3,1 10.059 1,80 59,0 4,5 1,0 4,6 15.155 2,11 50,7 5,9 1,0 5,4 19.480 2,25 47,4 6,6 1,0 Table 3 D(CCT) SB CCT M / P CRI SB / B P / B 6.500 K 0 6.308 1,20 83,2 1,4 0,7 0,33 7.048 1,33 79,2 1,7 0,7 0,67 7.885 1,45 75,1 2,0 0,7 1,3 9.944 1,68 67,7 2,6 0,7 2,7 17.168 2,08 56,3 3,9 0,7

[0048] Referring to Tables 1 to 3, the adjusted white light of Example 1 may have a maximum correlated color temperature, for example, about 20,000 K or less, at a correlated color temperature of the first white light D of 5,000 K and a relative intensity SB of a blue adjusting light of 5.4, and may have a minimum correlated color temperature, for example, 3,000 K or more, at a correlated color temperature of the first white light D of 3,000 K and a relative intensity SB of the blue adjusting light of 0.1. In addition, the adjusted white light of Example 1 may have a maximum M / P ratio of, for example, about 2.5 or less at a correlated color temperature of the first white light D of 3,000 K and a relative intensity SB of a blue adjusting light of 19.7, and may have a minimum M / P ratio of, for example, 0.6 or more at a correlated color temperature of the first white light D of 3.000 K and the relative intensity SB of the blue modeling light of 0.1. In addition, the adjusted white light of Example 1 may have a minimum color rendering index, for example, 30 or more at the correlated color temperature of the first white light D of 3,000 K and the relative intensity SB of the blue modeling light of 19.7, and may have a maximum color rendering index of, for example, 85 or less at the correlated color temperature of the first white light D of 3,000 K and the relative intensity SB of the blue modeling light of 0.1. In particular, a ratio SB / B of a peak intensity SB of the blue modeling light to the peak intensity B of the first blue light may have a maximum value of, for example, about 20 or less at a correlated color temperature of 3.000 K and the relative intensity SB of the blue modeling light of 19.7, and may have a minimum value of, for example, about 1 or more at a correlated color temperature of 6,500 K and a relative intensity SB of the blue modeling light of 0.33. This can be understood as a factor that affects the M / P ratio. In addition, a ratio P / B of a maximum peak intensity P in a band from 530 nm to 680 nm to the peak intensity B of the first blue light may have a maximum value of, for example, about 3.5 or less at the correlated color temperature of 3,000 K and the relative intensity SB of the blue modeling light of 0.1, and may have a minimum value of, for example, about 0.5 or more at the correlated color temperature of 6,500 K and a relative intensity SB of the blue modeling light of 2.7. This can be understood mainly as a factor that influences a color rendering index.As described above, the LED lighting device according to Example 1 can select a correlated color temperature, a color rendering index, and an M / P ratio in a wide range to meet optical properties of human-centered white light required depending on a specific situation, and can achieve a set white light with a significantly increased M / P ratio. Example 2

[0049] In the present invention, features of an LED lighting device according to Example 2 are described with reference to Fig. 7 and Fig. 8 described in detail. Fig. 7 shows emission spectra of white light N and a blue modeling light M emitted respectively from an LED light source and a modeling LED light source of the LED lighting device according to Example 2, and Fig. Fig. 8 shows emission spectra B1, B2, B3, B4, B5, B6, B7, B8, B9 and B10 of adjusted white lights emitted by the LED lighting device according to the embodiment of Fig. 7 are emitted. Fig. Figure 7 shows emission spectra of white light N with a correlated color temperature of 1,800 K and blue modeling light M with a peak intensity of 480 nm.

[0050] Referring to Fig. 7, Example 2 may comprise a second LED light source, for example, a Fig. 2B, and an adjusting LED light source comprising, for example, light-emitting devices 100Ba or 100Bb as shown in Fig. 3A or Fig. 3B. The second LED light source may be configured to emit a second white light N having an intensity adjusted in a melanopically sensitive region MS. The adjustment LED light source may be configured to emit a blue adjustment light M having a peak intensity in the melanopically sensitive region MS, as in Example 1. For example, the second LED light source may emit a second white light N combining a third blue light having a peak wavelength in a range of 435 nm to 465 nm, a third light excited by the blue light to have a peak wavelength in a range of 540 nm to 560 nm and a half-width of 60 nm or less, and a fourth light excited by the third blue light to have a peak wavelength in a range of 620 nm to 650 nm.In addition, the adjustment LED light source may, for example, emit a blue adjustment light M having a peak wavelength in a range from 465 nm to 495 nm. In Example 2, the drive control unit may, for example, be a drive control unit 20 of FIG. Fig. 1, respectively controlling the second LED light source and the adjustment LED light source to generate an adjusted white light in which the second white light N and the blue adjustment light M are combined. The adjusted white light of Example 2 can have an emission spectrum with significantly improved color rendering while maintaining an M / P ratio at a predetermined level.

[0051] In the following, properties of the adjusted white light from Example 2 are described with reference to Fig. 8 and Fig. 4 to Fig. 6 described together.

[0052] The adjusted white light of Example 2 may have a correlated color temperature in a range of 1,800 K to 20,000 K, a color rendering index ranging from about 3 to about 97, and an M / P ratio ranging from about 0.2 to about 2.6. In a spectrum of the adjusted white light of Example 2, a ratio SB / B of a peak intensity SB of the blue adjusting light to the peak intensity B of the third blue light may be in the range of 0.5 to 45, and a ratio P / B of a maximum peak intensity P in a band of 530 nm to 680 nm to the peak intensity B of the third blue light may be in the range of 0.5 to 10.5. In Example 2, the first M / P ratio of the second white light may be about 0.7 or less or about 0.65 or less, for example, in the range of 0.19 to 0.62 or about 0.5 to about 0.62, and the second M / P ratio of the adjusted white light may be in the range of 0.2 to 2.6.To ensure color rendering of the adjusted white color of Example 2, a color rendering index of the second white light may be about 80 or more, and a color rendering index of the adjusted white light of Example 2 may be about 85 or more, for example, about 85 to about 97 or about 88 to about 97. In this case, the second M / P ratio of the adjusted white light may be in the range of about 0.2 to 1.1.

[0053] The above values ​​were calculated in a test example as follows. A spectrum of a tuned white light was designed by combining a second white light N in which a third blue light with a peak wavelength of 450 nm, a third light emitted by a third wavelength conversion material β-SiAlON, and a fourth light emitted by a fourth wavelength conversion material (Sr,Ca)AlSiN 3:Eu, with a blue modeling light having a peak wavelength of 480 nm. In this case, a correlated color temperature of the second white light N was changed to 1,800 K, 2,200 K, 2,700 K, 3,000 K, 3,500 K, and 4,000 K, and an intensity SB of the blue modeling light to an intensity of the third blue light was changed in the range of 0 to 53 at each of the correlated color temperatures of the second white light N to measure and calculate a correlated color temperature (CCI), an M / P ratio (M / P), and a color rendering index (CRI) of the modeled white light, a ratio SB / B of peak intensity SB of the blue modeling light to peak intensity B of the third blue light, and a ratio P / B of a maximum peak intensity P in the band from 530 nm to 680 nm to the peak intensity B of the third blue light.The ratio P / B of the maximum peak intensity P in the band from 530 nm to 680 nm to the peak intensity B of the third blue light is a maximum peak intensity P in the range from 530 nm to 680 nm, measured under the assumption that the peak intensity B of the third blue light is 1. Some test examples in which upper limits and / or lower limits of characteristics of the adjusted white light were shown are listed in Tables 4 to 6 below.

[0054] Fig. 8 shows, in the above test example, spectra B1, B2, B3, B4, B5, B6, B7, B8, B9, and B10 of white light that were adjusted while setting the correlated color temperature of the second white light D to 1800 K and changing the relative intensity SB of the blue modeling light to 0, 1, 2, 5, 10, 20, 30, 40, 50, and 53. Zero (0) was included in the relative intensity SB of the blue modeling light to check optical properties such as the correlated color temperature and the like of the second white light N before adjusting the white light. In addition, the above-described correlated color temperatures and the like were determined for spectra B1, B2, B3, B4, B5, B6, B7, B8, B9, and B10. Fig. 8 and listed in Table 4. In addition, correlated color temperatures and the like of spectra of the white light that was adjusted while setting correlated color temperatures of the second white light N to 2,700 K and 4,000 K and changing the relative intensity SB of the blue modeling light were measured and listed in Tables 5 and 6. In Tables 5 and 6, calculation of spectra and measurement of optical properties were performed in the same manner as in Fig. 8 and Table 4. Table 4 N(CCT) SB CCT M / P CRI SB / B P / B 1.800 K 0 1.819 0,19 84,8 0,4 10,3 1 1.871 0,26 88,9 1,2 10,3 2 1.924 0,33 90,2 2,2 10,2 5 2.094 0,53 83,6 5,3 10,0 10 2.425 0,82 69,4 10,1 9,7 20 3.442 1,34 43,3 18,9 9,2 30 5.455 1,76 22,4 26,7 8,7 40 8.909 2,12 10,2 33,8 8,2 50 15.188 2,43 4,8 40,2 7,8 53 18.385 2,51 3,8 42,0 7,7 Table 5 N(CCT) SB CCT M / P CRI SB / B P / B 2.700 K 0 2.764 0,37 83,7 0,4 1,8 1 3.160 0,62 96,3 1,1 1,8 2 3.648 0,84 89,3 2,1 1,7 5 5.878 1,42 62,6 4,9 1,7 10 14.180 2,16 39,8 9,5 1,7 11 17.713 2,28 37,2 10,4 1,7 Table 6 N(CCT) SB CCT M / P CRI SB / B P / B 4.000 K 0 3.974 0,62 84,8 0,7 0,9 0,25 4.287 0,73 90,4 0,8 0,9 0,5 4.633 0,84 93,6 0,9 0,9 0,8 5.091 0,97 93,9 1,2 0,9 1 5.424 1,05 91,8 1,4 0,9 2 7.482 1,42 76,9 2,7 0,9 4,5 19.579 2,15 54,3 5,7 0,9

[0055] Referring to Tables 4 to 6, the adjusted white light of Example 2 may have a maximum correlated color temperature (about 20,000 K or less) at a correlated color temperature of the second white light N of 4,000 K and a relative intensity SB of the blue adjusting light of 4.5, and may have a minimum correlated color temperature, for example, 1,800 K or more, at a correlated color temperature of the second white light N of 1,800 K and a relative intensity SB of the blue adjusting light of 1. In addition, the adjusted white light of Example 2 may have a maximum M / P ratio of, for example, about 2.6 or less at a correlated color temperature of the second white light N of 1,800 K and a relative intensity SB of the blue adjusting light of 53, and may have a minimum M / P ratio of, for example, 0.2 or more at the correlated color temperature of the second white light N of 1.800 K and the relative intensity SB of the blue modeling light of 1. In addition, the modeled white light of Example 2 may have a minimum color rendering index, for example, 3 or more at the correlated color temperature of the second white light N of 1,800 K and the relative intensity SB of the blue modeling light of 53, and may have a maximum color rendering index of, for example, 97 or less at the correlated color temperature of the second white light D of 2,700 K and the relative intensity SB of the blue modeling light of 1. In particular, a ratio SB / B of a peak intensity SB of the blue modeling light to the peak intensity B of the third blue light may have a maximum value of, for example, about 45 or less at a correlated color temperature of 1.800 K and the relative intensity SB of the blue modeling light of 53, and may have a minimum value of, for example, about 0.5 or more at a correlated color temperature of 4,000 K and a relative intensity SB of the blue modeling light of 0.25. In addition, a ratio P / B of a maximum peak intensity P in a band from 530 nm to 680 nm to the peak intensity B of the third blue light may have a maximum value of, for example, about 10.5 or less at the correlated color temperature of 1,800 K and the relative intensity SB of the blue modeling light of 1, and may have a minimum value of, for example, about 0.5 or more at a correlated color temperature of 4,000 K and a relative intensity of the blue modeling light of 4.5.As described above, the LED lighting device according to Example 2 can achieve adjusted white light capable of selecting a correlated color temperature and a color rendering index in a wide range while maintaining an M / P ratio at a predetermined level to satisfy optical characteristics of a human-centered white light required depending on a specific situation.

[0056] Fig. 9 is a block diagram of an LED lighting device according to an exemplary embodiment, Fig. 10A is a graph illustrating emission spectra of a first white light D and a second white light N respectively emitted from a first LED light source and a second LED light source of the LED lighting device according to the embodiment of Fig. 9 are emitted, and Fig. 10B is a graph illustrating selective control of the first LED light source and the second LED light source of the LED lighting device according to the embodiment of Fig. 9 represents. Fig. Figure 10A shows emission spectra of the first white light D with a correlated color temperature of 6,500 K and the second white light N with a correlated color temperature of 1,800 K.

[0057] Referring to Fig. 9, an LED lighting device according to an exemplary embodiment may comprise a first and a second LED light source Fig. 2A and Fig. 2B and may not include an adjustable LED light source. For example, a first LED light source 10Aa may include a first light-emitting diode emitting a first blue light having a peak wavelength in a range of 435 nm to 465 nm, a second light-emitting diode emitting a second blue light having a peak wavelength in a range of 465 nm to 495 nm, a first wavelength conversion material excited by the first and second blue lights to emit the first light having a peak wavelength in a range of 520 nm to 560 nm, and a first wavelength conversion material excited by the first and second blue lights to emit a second light having a peak wavelength in a range of 600 nm to 645 nm, and may be configured to emit a first white light.A second LED light source 10Ab may include a third light-emitting diode that emits a third blue light with a peak wavelength in a range of 435 nm to 465 nm, a third wavelength conversion material excited by the third blue light to emit a third light with a peak wavelength in a range of 540 nm to 560 nm and a half-width of 60 nm or less, and a fourth wavelength conversion material excited by the third blue light to emit a fourth light with a peak wavelength in a range of 620 nm to 650 nm, and may be configured to emit a second white light. A drive control unit 20 may control currents I1 and I2 applied to the first LED light source 10Aa and the second LED light source 10Ab, respectively, to generate a set white light.In an exemplary embodiment, the LED lighting device may combine the first and second LED light sources that satisfy a specific condition to provide human-centered white light in which a correlated color temperature, an M / P ratio, and the like are adjusted. Since components of the LED lighting device described in . Fig. 9, have the same (or similar) features as those shown in Fig. 1, a repeated description is omitted.

[0058] Referring to Fig. 10A together, in an exemplary embodiment, the first LED light source 10Aa may have two peak intensities in a melanopically sensitive zone MS as in Example 1 and may be configured to emit a first white light D with a color rendering index adjusted by a wavelength conversion material, and the second LED light source 10Ab may be configured to emit a second white light N with an intensity adjusted in the melanopically sensitive region MS as in Example 2. In an exemplary embodiment, the drive control unit 20 may control each of the first and second LED light sources to generate an adjusted white light in which the first and second white lights D and N are combined. The adjusted white light of an exemplary embodiment may have an emission spectrum with an adjusted M / P ratio while maintaining a color rendering index at a high level.

[0059] Referring to Fig. 10B, the first LED light source 10Aa and the second LED light source 10Ab of an exemplary embodiment can be combined by varying correlated color temperatures. The first LED light source 10Aa and the second LED light source 10Ab can each have a correlated color temperature in a specific range, and the first white light D of the first LED light source 10Aa can be implemented in a higher correlated color temperature range than the second white light N of the second LED light source 10Ab; but it is not limited thereto. For example, the first white light D can have a correlated color temperature in a range of 3,000 K to 6,500 K, and the second white light N can have a correlated color temperature in a range of 1,800 K to 4,000 K.Test Examples I, II and III capable of determining upper and lower limits of characteristics of the adjusted white light of Example 3 described later from the correlated color temperatures of the first white light D and the second light N shown in . Fig. 10B are listed in Tables 7 to 9 below. Example 3

[0060] In the following, properties of the adjusted white light according to Example 3 are described with reference to Fig. 11 and Tables 7 to 9 together. Fig. 11 shows emission spectra C1, C2, C3, C4, C5, C6, C7, C8, C9, C10 and C11 of adjusted white lights emitted from the LED lighting device according to Example 3.

[0061] The adjusted white light of Example 3 may have a correlated color temperature in a range of 1,800 K to 6,500 K, a color rendering index ranging from about 80 to 95, and an M / P ratio ranging from about 0.2 to about 1.2. In a spectrum of the adjusted white light of Example 3, a ratio SB / B of a peak intensity SB of the second blue adjusting light, for example, a peak intensity in a range of 465 nm to 495 nm, to the peak intensity B of the third blue light, for example, a peak intensity in a range of 435 nm to 465 nm, may be in the range of about 0.2 to about 2.5, and a ratio P / B of a maximum peak intensity P in a band of 530 nm to 680 nm to the peak intensity B of the third blue light may be in the range of about 0.5 to about 9. The above values ​​were calculated in a test example as follows.The first white light D and the second white light N were designed in the same way as in the test example of the first and second examples. In this case, a correlated color temperature of the first white light D was changed to 3,000 K, 3,500 K, 4,000 K, 5,000 K, 5,700 K, and 6,500 K, a correlated color temperature of the second white light N was changed to 1,800 K, 2,200 K, 2,700 K, 3,000 K, 3,500 K, and 4,000 K, and an intensity ratio of the first white light D to the intensity of the second white light N was changed to 1:0, 0.9:0.1, 0.8:0.2, 0.7:0.3, 0.6:0.4, 0.5:0.5, 0.4:0.6, 0.3:0.7, 0.2:0.8, 0.1:0.9, and 0:1 in a The combination of correlated color temperatures was changed so that each value was measured and calculated. The ratio of the intensity of the first white light D to the intensity of the second white light N represents an intensity ratio when the sum of the intensity of the first white light D and the intensity of the second white light N is 1.Some test examples in which upper and lower limits of the characteristics of the adjusted white light from Example 3 were shown are listed in Tables 7 to 9 below.

[0062] Fig. 11 shows spectra C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, and C11 of white adjusted light, while a correlated color temperature of a first white light D is set to 3,000 K, a correlated color temperature of a second white light N is set to 1,800 K, and relative intensities of the first white light D and the second white light N are changed. Zero (0) was included in each intensity to check optical properties of the correlated color temperature and the like of the first and second white lights D and N before the first and second white lights D and N were adjusted. In addition, the above-mentioned correlated color temperature and the like were determined for the spectra C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, and C11. Fig. 11 and listed in Table 7. In addition, the correlated color temperature and the like of adjusted white lights in a test example in which correlated color temperatures of the first and second white lights D and N are 6,500 K and 2,700 K, respectively, and a test example in which correlated color temperatures of a first and second white light D and N are 6,500 K and 4,000 K, respectively, were measured and listed in Tables 8 and 9. In Tables 8 and 9, the calculation of spectra and the measurement of optical properties were carried out in the same manner as in Fig. 11 and Table 7. Table 7 D:N (CCT) D:N (Intensität) CCT M / P CRI SB / B P / B 3.000 K: 1.800 K 1:0 3.069 0,65 84,1 2,2 3,3 0,9:1 2.933 0,62 85,1 2,1 3,5 0,8:0,2 2.799 0,58 86,0 2,0 3,7 0,7:0,3 2.666 0,54 86,9 1,9 4,0 0,6:0,4 2.536 0,50 87,8 1,8 4,4 0,5:0,5 2.409 0,46 88,5 1,6 4,8 0,4:0,6 2.285 0,42 89,2 1,5 5,4 0,3:0,7 2.164 0,37 89,5 1,2 6,1 0,2:0,8 2.046 0,31 89,1 1,0 7,0 0,1:0,9 1.931 0,26 87,4 0,6 8,1 0:1 1.819 0,19 84,8 0,4 9,8 Table 8 D:N (CCT) D:N (Intensität) CCT M / P CRI SB / B P / B 6.500 K: 2.700 K 1:0 6.308 1,20 83,2 1,4 0,7 0,9:1 5.735 1,12 85,7 1,3 0,7 0,8:0,2 5.223 1,04 88,1 1,2 0,8 0,7:0,3 4.767 0,96 90,0 1,1 0,8 0,6:0,4 4.363 0,88 92,3 1,0 0,9 0,5:0,5 4.005 0,79 94,1 0,9 1,0 0,4:0,6 3.689 0,71 94,2 0,8 1,1 0,3:0,7 3.411 0,63 92,8 0,7 1,2 0,2:0,8 3.167 0,54 90,4 0,5 1,4 0,1:0,9 2.953 0,46 87,3 0,4 1,6 0:1 2.764 0,37 83,7 0,4 1,8 Table 9 D:N (CCT) D:N (Intensität) CCT M / P CRI SB / B P / B 6.500 K: 4.000 K 1:0 6.308 1,20 83,2 1,4 0,7 0,9:1 5.967 1,14 85,8 1,3 0,7 0,8:0,2 5.657 1,08 88,3 1,1 0,7 0,7:0,3 5.375 1,01 90,4 1,0 0,7 0,6:0,4 5.119 0,95 92,1 0,9 0,7 0,5:0,5 4.884 0,90 92,0 0,8 0,7 0,4:0,6 4.669 0,84 91,5 0,7 0,7 0,3:0,7 4.473 0,78 90,6 0,7 0,7 0,2:0,8 4.292 0,73 89,1 0,7 0,8 0,1:0,9 4.126 0,67 87,1 0,6 0,8 0:1 3.974 0,62 84,8 0,6 0,8

[0063] Referring to Tables 7 to 9, the adjusted white light of Example 3 may have a maximum correlated color temperature, for example, about 6,500 K or less, with correlated color temperatures of first and second white lights D and N of 6,500 K and 4,000 K and a ratio of an intensity of the first white light D to an intensity of the second white light N of 0.9:0.1, and may have a minimum correlated color temperature, for example, 1,800 K or more, with correlated color temperatures of first and second white lights D and N of 3,000 K to 1,800 K and a ratio of an intensity of the first white light D to the intensity of the second white light N of 0.1:0.9. In addition, the adjusted white light of Example 3 may have a maximum M / P ratio, for example, about 1.2 or less, at correlated color temperatures of the first and second white lights D and N of 6,500 K and 4.000 K and a ratio of the intensity of the first white light D to the intensity of the second white light N of 0.9:0.1, and may have a minimum M / P ratio, for example about 0.2 or more, at correlated color temperatures of the first and second white lights D and N of 3,000 K to 1,800 K and a ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9. In addition, the adjusted white light of Example 3 may have a maximum color rendering index, for example, about 95 or less, at correlated color temperatures of the first and second white lights D and N of 6,500 K and 2,700 K and a ratio of one of the first white light D to the intensity of the second white light N of 0.5:0.5, and may maintain about 80 or more of a color rendering index in an entire correlated color temperature range of the first and second white lights D and N.

[0064] A ratio SB / B of a peak intensity SB ranging from 465 nm to 495 nm to a peak intensity B ranging from 435 nm to 465 nm may have a maximum value of, for example, about 2.5 or less at correlated color temperatures of 3,000 K and 1,800 K and a ratio of the intensity of the first white light D to the intensity of the second white light N of 0.9:0.1, and may have a minimum value of, for example, about 0.2 or more at correlated color temperatures of 6,500 K and 2,700 K and a ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9. In addition, a ratio P / B of a maximum peak intensity P in a band from 530 nm to 680 nm to a peak intensity B in a range from 435 nm to 465 nm may have a maximum value, for example 9 or less, at correlated color temperatures of the first and second white lights D and N of 3,000 K and 1.800 K and a ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9, and may have a minimum value, for example, about 0.5 or more, at correlated color temperatures of the first and second white lights D and N of 6,500 K to 2,700 K and a ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9. As described above, the LED lighting device according to Example 3 can achieve adjusted white light capable of selecting a correlated color temperature and a color rendering index in a wide range while maintaining an M / P ratio at a predetermined level to satisfy optical characteristics of human-centered white light required depending on a specific situation.

[0065] A first white light D and a second white light N that satisfy specific spectral conditions can be used to obtain the above-described adjusted white light of Example 3. This will be explained below with reference to Fig. 10A and Fig. 12 described.

[0066] Referring to Fig. 10A, in the spectrum of the first white light D emitted from the first LED light source, the peak intensity of the second blue light, for example, the peak intensity in a range from 465 nm to 495 nm, may be 50% or more compared to the peak intensity of blue light, for example, the peak intensity ranging from 435 nm to 465 nm. To achieve a BLH reduction effect, a peak intensity ratio of the first and second blue lights may be selected to be 70% or more, and further, the peak intensity of the second blue light may be selected to be greater than the peak intensity of the first blue light. In this case, the wavelength and intensity ratio of the second blue light may be adjusted in the range where a color rendering index is maintained at 80 or more, and in detail, at 90 or more.Regarding color rendering, a maximum intensity in a band from 520 nm to 560 nm can be in a range of 50% to 160% of the peak intensity of the second blue light.

[0067] Fig. 12 is a graph illustrating emission spectra of second white lights of a light-emitting device used as a second LED light source in the embodiment in Fig. 9 can be used.

[0068] Fig. Figure 12 shows emission spectra D1, D2, D3, D4, D5 and D6, in which correlated color temperatures 1,800 K, 2,200 K, 2,700 K, 3,000 K, 3,500 K and 4,000 K are designed to be differentiated by using a third wavelength conversion material (β-SiAlON) and a fourth wavelength conversion material ((Sr,Ca)AlSiN 3:Eu) together with a light-emitting diode emitting a third blue light having a wavelength of 445 nm, and a mixing ratio of a first and a second wavelength conversion material is adjusted.

[0069] Referring to Fig. 12, a second white light of the second LED light source applicable to the present disclosure may satisfy two spectral conditions. A first spectral condition may be defined as the proportion of light 1 emitted by a blue LED, for example, light emitted by an unconverted blue LED, to light 2 in an entire blue wavelength band in a spectrum of a final white light. In this case, an integral light intensity of light 1 may be expressed as an integral quantity of a spectrum corresponding to a band from 440 nm to 460 nm, and an integral light intensity of light 2 may be expressed as an integral quantity of a spectrum corresponding to a band from 380 nm to 500 nm.The integral light intensity 1 may have a constant value proportional to the integral light intensity of light 2, while the integral light intensity of light 2 may have a relatively low value because the light intensity in a melanopically related wavelength band is reduced compared to white light according to a conventional method. As can be seen from Table 10 below, the ratio 1 / 2 may range from 50% to 65% depending on the first spectral condition.

[0070] The second spectral condition can be defined as the ratio of light ⓐ in a cyan band to light ⓑ in a green band in a spectrum of final white light. In this case, the integral light intensity of light ⓐ can be expressed as an integral quantity of a spectrum corresponding to a band from 480 nm to 500 nm, and an integral light intensity of light ⓑ can be expressed as an integral quantity of a spectrum corresponding to a band from 540 nm to 550 nm. The integral light quantity of light ⓐ can be a light intensity of a light with respect to a melanopic ratio and can have a relatively small value as the melanopic ratio is reduced. As shown in Table 10 below, the ratio ⓐ / ⓑ can be 30% or less depending on the second spectral condition. Table 10 Element D1 D2 D3 D4 D5 D6 CCT (K) 1.800 2.200 2.700 3.000 3.500 4.200 Spektrale Bedingung 1 (① / ②) 55 % 58% 63 % 57% 58% 56% Spektrale Bedingung 2 (ⓐ / ⓑ) 4,1 % 5,1 % 5,3 % 14% 16% 25 %

[0071] As described above, a second white light of a second LED light source usable in exemplary embodiments may have a spectrum in which an integral light intensity of 440 nm to 460 nm is in the range of 50% to 65% of an integral light intensity of 380 nm to 500 nm, and an integral light intensity of 480 nm to 500 nm is in the range of 30% or less of an integral light intensity of 540 nm to 560 nm.

[0072] The second spectral condition can be further classified as a value related to a melanopic ratio according to a correlated color temperature. For example, if the correlated color temperature of a white light is in the range of 1,800 K to 2,800 K, an integral light intensity of 480 nm to 500 nm can be in the range of 6% or less of the integral light intensity of 540 nm to 560 nm. Furthermore, if the correlated color temperature of a white light is in the range of 2,800 K to 4,000 K, the integral light intensity of 480 nm to 500 nm can be in the range of 10% to 30% of the integral light intensity of 540 nm to 560 nm.

[0073] Fig. 13 is a block diagram of an LED lighting device according to an exemplary embodiment and Fig. 14 is a graph illustrating a first white light D, a second white light N, and a blue adjustment light M respectively emitted from a first LED light source, a second LED light source, and an adjustment LED light source of the LED lighting device according to the embodiment of Fig. 13 are emitted. Fig. Figure 14 shows emission spectra of the first white light D with a correlated color temperature of 6,500 K, the second white light N with a correlated color temperature of 1,800 K, and the blue modeling light M with a peak intensity of 480 nm.

[0074] Referring to Fig. 13, an LED lighting device according to an exemplary embodiment may include a first adjustment LED light source in addition to first and second LED light sources. In an exemplary embodiment, a drive control unit 20 may control currents 11, 12, and 13 applied to a first LED light source 10Aa, a second LED light source 10Ab, and an adjustment LED light source 10B, respectively, to generate an adjusted white light. In an exemplary embodiment, the LED lighting device may provide a human-centered white light with an M / P ratio or a color rendering index adjusted at a high level. Since the first and second LED light sources and the adjustment LED light sources are composed of Fig. 13 have the same properties as the light sources of Example 1 to Example 3, a repeated description is omitted.

[0075] Referring to Fig. 14 together, in an exemplary embodiment, a first LED light source 10Aa may have two peak intensities in a melanopically sensitive zone MS as in Example 1 and may be configured to emit a first white light D with a color rendering adjusted by a wavelength conversion material, and a second LED light source 10Ab may be configured to emit a second white light N with an intensity adjusted in the melanopically sensitive region MS as in Example 2. The adjustment LED light source 10B may also be configured to emit a blue adjustment light M with a peak intensity in the melanopically sensitive region MS. The adjusted white light of an exemplary embodiment may have an emission spectrum in which an M / P ratio or a color rendering index is adjusted at a high level. Example 4

[0076] In the following, properties of the adjusted white light according to Example 4 are described with reference to Fig. 15 and Tables 11 to 13. Fig. 15 illustrates emission spectra E1, E2, E3, E4, E5, E6, E7, E8 and E9 of an adjusted white light emitted from the LED lighting device according to the embodiment of Fig. 13.

[0077] The adjusted white light of Example 4 may have a correlated color temperature in a range of 1,900 K to 20,000 K, a color rendering index ranging from about 7 to 91, and an M / P ratio ranging from about 0.3 to about 2.6. In a spectrum of the adjusted white light of Example 4, a ratio SB / B of a peak intensity SB of a second blue adjusting light, for example, a peak intensity in a range of 465 nm to 495 nm, to the peak intensity B of the first or third blue light, for example, a peak intensity in a range of 435 nm to 465 nm, may be in the range of about 1 to about 35, and a ratio P / B of a maximum peak intensity P in a band of 530 nm to 680 nm to the peak intensity B of the first or third blue light may be in the range of about 0.5 to about 9.Similar to the test example of Example 3, the above values ​​were measured and calculated by changing a correlated color temperature of a first white light D to 3,000 K, 3,500 K, 4,000 K, 5,000 K, 5,700 K and 6,500 K, changing a correlated color temperature of a second white light N to 1,800 K, 2,200 K, 2,700 K, 3,000 K, 3,500 K and 4,000 K, and changing a ratio of an intensity of the first white light D to the intensity of the second white light N in each correlated color temperature combination to 1:0, 0.9:0.1, 0.8:0.2, 0.7:0.3, 0.6:0.4, 0.5:0.5, 0.4:0.6, 0.3:0.7, 0.2:0.8, 0.1:0.9, and 0:1, and the intensity SB of a blue modeling light was changed to the intensity B of the first blue light so that it was in the range of 0 to 46. Some test examples in which upper and lower limits of characteristics of the modeled white light of Example 3 were shown are listed in Tables 11 to 13 below.

[0078] Fig. 15 shows, in test examples of Example 4, spectra E1, E2, E3, E4, E5, E6, E7, E8, and E9 of a white adjusted light, while setting a correlated color temperature of the first white light D to 3,000 K, a correlated color temperature of the second white light N to 1,800 K, relative intensities of the first white light D and the second white light N to 10:90, and changing the intensity of the blue adjusting light. Zero (0) was included in the relative intensity SB of the blue adjusting light to check optical properties such as the correlated color temperature and the like of the first white light D before the white light was adjusted. In addition, correlated color temperatures and the like of adjusted white lights in a test example in which correlated color temperatures of the first and second white lights D and N were 6,500 K and 4,000 K, respectively.000 K, and a test example in which correlated color temperatures of a first and second white light D and N are 6,500 K and 2,700 K, respectively, are listed in Tables 12 and 13. In Tables 12 and 13, the calculation of the spectra and the measurement of the optical properties were carried out in the same way as in . Fig. 15 and Table 11. Table 11 D:N (CCT) D:N (Intensität) SB CCT M / P CRI SB / B P / B 3.000 K: 1.800 K 0,1:0,9 0 1.931 0,26 87,4 0,6 8,1 1 1.994 0,33 90,3 1,6 8,1 2 2.060 0,41 89,3 2,5 8,0 5 2.273 0,62 80,5 5,3 7,8 10 2.711 0,94 65,5 9,6 7,4 20 4.222 1,49 37,8 17,2 6,8 30 7.216 1,94 18,7 23,6 6,3 40 12.656 2,32 10,0 29,2 5,9 46 19.031 2,51 7,3 32,1 5,6 Table 12 D:N (CCT) D:N (Intensity) SB CCT M / P CRI SB / B P / B 6,500K: 4,000K 0,9:0,1 0 5.967 1,14 85,8 1,3 0,7 0,25 6.465 1,23 82,9 1,5 0,7 0,5 7.009 1,33 79,8 1,7 0,7 1 8.257 1,50 73,8 2,2 0,7 2 11.706 1,82 63,6 3,1 0,7 3 17.812 2,10 55,9 4,1 0,7 3,2 19.687 2,15 54,5 4,3 0,7 Table 13 D:N (CCT) D:N (Intensity) SB CCT M / P CRI SB / B P / B 6,500K: 2,700K 0,5:0,5 0 4.005 0,79 94,1 0,9 0,99 0,5 6.465 1,23 82,9 1,5 0,99 1 7.009 1,33 79,8 1,7 0,98 2 8.257 1,50 73,8 2,2 0,97 3 11.706 1,82 63,6 3,1 0,96 5 17.812 2,10 55,9 4,1 0,95 6 19.687 2,15 54,5 4,3 0,94

[0079] Referring to Tables 11 to 13, the adjusted white light of Example 4 may have a maximum correlated color temperature, for example, about 20,000 K or less, with correlated color temperatures of first and second white lights D and N of 6,500 K and 4,000 K and an intensity SB of a blue adjusting light of 3.2, and may have a minimum correlated color temperature, for example, 1,900 K or more, with correlated color temperatures of the first and second white lights D and N of 3,000 K to 1,800 K and a ratio of an intensity of the first white light D to the intensity of the second white light N of 0.1:0.9. In addition, the adjusted white light of Example 4 may have a maximum M / P ratio, for example, about 2.6 or less, with color temperatures of the first and second white lights D and N of 3,000 K and 1.800 K, the ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9 and an intensity SB of the blue modeling light of 46, and may have a minimum M / P ratio, about 0.3 or more, at color temperatures of the first and second white lights D and N of 3,000 K to 1,800 K, the ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9 and an intensity SB of the blue modeling light of 1. In addition, the modeled white light of Example 4 may have a maximum color rendering index, for example, about 91 or less, at color temperatures of the first and second white lights D and N of 3,000 K and 1.800 K, the ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9 and an intensity SB of the blue modeling light of 1, and may have a minimum color rendering index, for example about 7 or more, at color temperatures of the first and second white lights D and N of 3,000 K to 1,800 K, the ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9 and an intensity SB of the blue modeling light of 46.

[0080] In addition, a ratio SB / B of a peak intensity SB ranging from 465 nm to 495 nm, which may be a peak intensity of a blue modeling light, to a peak intensity B ranging from 435 nm to 465 nm may have a maximum value, for example, 35 or less, at color temperatures of the first and second white lights D and N of 3,000 K and 1,800 K, the ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9, and an intensity SB of the blue modeling light of 46, and may have a minimum value, for example, about 1 or more, at color temperatures of the first and second white lights D and N of 3,000 K to 1,800 K, the ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9, and an intensity SB of the blue modeling light of 1.In addition, a ratio P / B of a peak intensity P in a band from 530 nm to 680 nm to a peak intensity B in a range from 435 nm to 465 nm may have a maximum value, for example, 9 or less, at color temperatures of the first and second white lights D and N of 3,000 K and 1,800 K, the ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9 and an intensity SB of the blue modeling light of 1, and may have a minimum value, for example, about 0.5 or more, at color temperatures of the first and second white lights D and N of 6,500 K to 4,000 K, the ratio of the intensity of the first white light D to the intensity of the second white light N of 0.1:0.9 and an intensity SB of the blue modeling light of 32.

[0081] As described above, the LED lighting device according to Example 4 can obtain an adjusted white light capable of selecting an M / P ratio or a color rendering index at a specific level to satisfy optical characteristics of human-centered white light required depending on a specific situation. For example, an M / P ratio of the adjusted white light of Example 4 can satisfy a value of 2 or more in the case where the intensity of the first white light is 50 or more when the sum of the intensities of the first and second white lights is 100. In embodiments, the color rendering index of the adjusted white light of Example 4 can satisfy a value of 80 or more in the case where the intensity of the first white light is less than 50 when the sum of the intensities of the first and second white lights is 100.

[0082] As described above, according to exemplary embodiments, a human-centered LED lighting device can be provided that adjusts a spectrum in a region of 465 nm to 495 nm to adjust a release of the hormone melatonin, which plays a role in the human biorhythm.

[0083] While exemplary embodiments have been shown and described above, it will be apparent to one of ordinary skill in the art that modifications and variations could be made without departing from the scope of the present inventive concept as defined by the appended claims.

Claims

[1] Light-emitting diode (LED) lighting device comprising: a first LED light source (10Aa, 100Aa) configured to emit a first white light, and comprising: a first light-emitting diode (130) configured to emit a first blue light having a peak wavelength in a range of 435 nm to 465 nm, a second light-emitting diode (140) configured to emit a second blue light having a peak wavelength in a range of 465 nm to 495 nm, a first wavelength conversion material (154Aa) configured to be excited by the first blue light and the second blue light and to emit a first light having a peak wavelength in a range of 520 nm to 560 nm, and a second wavelength conversion material (156Aa) configured to be excited by the first and second blue lights and to emit a second light having a peak wavelength in a range of 600 nm to 645 nm; a second LED light source (10Ab, 100Ab) configured to emit a second white light, and comprising: a third light-emitting diode (135) configured to emit a third blue light having the peak wavelength in the range of 435 nm to 465 nm, a third wavelength conversion material (154Ab) configured to be excited by the third blue light and to emit a third light having a peak wavelength in a range of 540 nm to 560 nm and a half-width of 60 nm or less, and a fourth wavelength conversion material (156Ab) configured to be excited by the third blue light and to emit a fourth light having a peak wavelength in a range of 620 nm to 650 nm; an adjustment LED light source (10B, 100Ba, 100Bb) configured to emit a blue adjustment light whose peak wavelength is in the range of 465 nm to 495 nm; and a drive control unit (20) configured to control currents applied to the first LED light source (10Aa, 100Aa), the second LED light source (10Ab, 100Ab), and the adjustment LED light source (10B, 100Ba, 100Bb), respectively, to generate an adjusted white light. [2] The LED lighting device according to claim 1, wherein the drive control unit (20) is further configured to drive the adjustment LED light source (10B, 100Ba, 100Bb) and the second LED light source (10Ab, 100Ab) to generate the adjusted white light, and wherein, in a spectrum of the adjusted white light, a ratio of a peak intensity of the blue adjustment light to a peak intensity of the third blue light is in a range of 0.5 to 45, and a ratio of a maximum peak intensity of a band from 530 nm to 680 nm to the peak intensity of the third blue light is in a range of 0.5 to 10.

5. [3] The LED lighting device according to claim 1 or 2, wherein the drive control unit (20) is further configured to drive the first LED light source (10Aa, 100Aa) and the second LED light source (10Ab, 100Ab) to generate the adjusted white light, and wherein, in a spectrum of the adjusted white light, a ratio of a peak intensity SB in a band from 465 nm to 495 nm to a peak ratio in a band from 435 nm to 465 nm is in a range from 0.2 to 2.5, and a ratio of a maximum peak intensity in a range from 530 nm to 680 nm to the peak intensity in the band from 435 nm to 465 nm is in a range from 0.5 to 9. [4] The LED lighting device according to any one of claims 1 to 3, wherein the drive control unit (20) is further configured to drive the first LED light source (10Aa, 100Aa), the second LED light source (10Ab, 100Ab), and the adjustment LED light source (10B, 100Ba, 100Bb) to generate the adjusted white light, and wherein, in a spectrum of the adjusted white light, a ratio of a peak intensity in a band from 465 nm to 495 nm to a peak ratio in a band from 435 nm to 465 nm is in a range from 1 to 35, and a ratio of a maximum peak intensity in a band from 530 nm to 680 nm to the peak intensity in the band from 435 nm to 465 nm is in a range from 0.5 to 9. [5] Light-emitting diode (LED) lighting device comprising: a first LED light source (10Aa, 100Aa) configured to emit a first white light, and comprising: a first light-emitting diode (130) configured to emit a first blue light having a peak wavelength in a range of 435 nm to 465 nm, a second light-emitting diode (140) configured to emit a second blue light having a peak wavelength in a range of 465 nm to 495 nm, a first wavelength conversion material (154Aa) configured to be excited by the first and second blue lights and to emit a first light having a peak wavelength in a range of 520 nm to 560 nm, and a second wavelength conversion material (156Aa) configured to be excited by the first and second blue lights and to emit a second light having a peak wavelength in a range of 600 nm to 645 nm; a second LED light source (10Ab, 100Ab) configured to emit a second white light, and comprising: a third light-emitting diode (135) configured to emit a third blue light having the peak wavelength in the range of 435 nm to 465 nm, a third wavelength conversion material (154Ab) configured to be excited by the third blue light and to emit a third light having a peak wavelength in a range of 540 nm to 560 nm and a half-width of 60 nm or less, and a fourth wavelength conversion material (156Ab) configured to be excited by the third blue light and to emit a fourth light having a peak wavelength in a range of 620 nm to 650 nm; and a drive control unit (20) configured to control currents applied to the first LED light source (10Aa, 100Aa) and the second LED light source (10Ab, 100Ab) respectively to generate a set white light, wherein in a spectrum of the adjusted white light, a ratio of a peak intensity in a band from 465 nm to 495 nm to a peak ratio in a band from 435 nm to 465 nm is in a range of 0.2 to 2.5, and a ratio of a maximum peak intensity in a band from 530 nm to 680 nm to the peak intensity in the band from 435 nm to 465 nm is in a range of 0.5 to 9. [6] Light-emitting diode (LED) lighting device comprising: an LED light source (10A) configured to emit white light having a first melanopic-photopic (M / P) ratio; an adjustment LED light source (10B) configured to emit a blue adjustment light having a peak wavelength in a range of 465 nm to 495 nm; and a drive control unit (20) configured to control currents applied to the LED light source (10A) and the adjustment LED light source (10B), respectively, to generate an adjusted white light having a second M / P ratio higher than the first M / P ratio. [7] LED lighting device according to claim 6, wherein the LED light source (10A) comprises: a first light-emitting diode (130) configured to emit a first blue light having a peak wavelength in a range of 435 nm to 465 nm, a second light-emitting diode (140) configured to emit a second blue light having the peak wavelength in the range of 465 nm to 495 nm, a first wavelength conversion material (154Aa) configured to be excited by the first and second blue lights and to emit a first light having a peak wavelength in a range of 520 nm to 560 nm, and a second wavelength conversion material configured to be excited by the first and second blue lights and to emit a second light having a peak wavelength in a range of 590 nm to 655 nm. [8] The LED lighting device according to claim 7, wherein the first M / P ratio is in a range of 0.65 to 1.2 and wherein the second M / P ratio is 1.2 or more. [9] LED lighting device according to one of claims 6 to 8, wherein the LED light source (10A) comprises: at least one light-emitting diode (135) configured to emit a third blue light having a peak wavelength in the range of 435 nm to 465 nm, a third wavelength conversion material (154Ab) configured to be excited by the third blue light and to emit a third light having a peak wavelength in a range of 540 nm to 560 nm and a half-width of 60 nm or less, and a fourth wavelength conversion material (156Ab) configured to be excited by the third blue light and to emit a fourth light having a peak wavelength in a range of 620 nm to 650 nm. [10] The LED lighting device according to claim 9, wherein a color rendering index of the adjusted white light is 85 or more, wherein the first M / P ratio is in a range of 0.19 to 0.62, and wherein the second M / P ratio is in a range of 0.2 to 1.1.

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